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MIUCHI KentaroGraduate School of Science / Division of PhysicsAssociate Professor
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■ Paper- SPIE, Aug. 2024, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 99 - 99International conference proceedings
- Elsevier BV, Mar. 2024, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 169242 - 169242Scientific journal
- Abstract We have been developing a high-pressure xenon gas time projection chamber (TPC) to search for neutrinoless double beta (0νββ) decay of 136Xe. The unique feature of this TPC is in the detection part of ionization electrons, called ELCC. ELCC is composed of multiple units, and one unit covers 48.5cm2. A 180L size prototype detector with 12 units, 672 channels, of ELCC was constructed and operated with 7.6bar natural xenon gas to evaluate the performance of the detector at around the Q value of 136Xe 0νββ. The obtained FWHM energy resolution is 0.73+-0.11% at 1836keV. This corresponds to 0.60+-0.03% to 0.70+-0.21% of energy resolution at the Q value of 136Xe 0νββ. This result shows the scalability of the AXEL detector with ELCC while maintaining high energy resolution. Factors determining the energy resolution were quantitatively evaluated and the result indicates further improvement is feasible. Reconstructed track images show distinctive structures at the endpoint of electron tracks, which will be an important feature to distinguish 0νββ signals from gamma-ray backgrounds.Oxford University Press (OUP), Dec. 2023, Progress of Theoretical and Experimental PhysicsScientific journal
- Abstract NEWAGE is a direction-sensitive dark matter search experiment with a 3D tracking detector based on a gaseous micro time projection chamber. A direction-sensitive dark matter search was carried out at Kamioka Observatory with a total live time of 318.0 days resulting in an exposure of 3.18 kg·days. A new gamma-ray rejection and a head–tail determination analysis were implemented for this work. No significant non-isotropic signal from the directional analysis was found and a 90% confidence level upper limit on a spin-dependent weakly interactive massive particle (WIMP)–proton cross section of 25.7 pb for a WIMP mass of 150 GeV/c2 was derived. This analysis marks the most stringent upper limit in the direction-sensitive dark matter searches.Oxford University Press (OUP), Oct. 2023, Progress of Theoretical and Experimental Physics, 2023(10) (10)Scientific journal
- The existence of the axion is a unique solution for the strong CP problem, and the axion is one of the most promising candidates of the dark matter. Investigating Solar Axion by Iron-57 (ISAI) is being prepared as a complemented table-top experiment to confirm the solar axion scenario. Probing an X-ray emission from the nuclear transitions associated with the axion-nucleon coupling is a leading approach. ISAI searches for the monochromatic 14.4 keV X-ray from the first excited state of ^{57}Fe using a state-of-the-art pixelized silicon detector, dubbed XRPIX, under an extremely low-background environment. We highlight scientific objectives, experimental design and the latest status of ISAI.Stichting SciPost, Jul. 2023, SciPost Physics Proceedings, (12) (12)Scientific journal
- Jul. 2023, Physical Review D, 108(1) (1)Scientific journal
- Abstract Dark matter with MeV scale mass is difficult to detect with standard direct search detectors. However, they can be searched for by considering the up-scattering of kinetic energies by cosmic rays. Because the dark matter density is higher in the central region of the Galaxy, the up-scattered dark matter will arrive at Earth from the direction of the Galactic center. Once the dark matter is detected, we can expect to recognize this feature by directional direct detection experiments. In this study, we simulate the nuclear recoils of the up-scattered dark matter and quantitatively reveal that a large amount of this type of dark matter is arriving from the direction of the Galactic center. Also, we have shown that the characteristic signatures of the up-scattered dark matter can be verified with more than 5σ confidence levels for the assumed target atoms and future upgrades to directional detectors.IOP Publishing, Jul. 2023, Journal of Cosmology and Astroparticle Physics, 2023(07) (07), 061 - 061Scientific journal
- Jun. 2023, European Physical Journal C, 83(6) (6)Scientific journal
- Nov. 2022, European Physical Journal C, 82(11) (11)Scientific journal
- Oct. 2022, Physical Review Letters, 129(16) (16)Scientific journal
- Aug. 2022, Physical Review C, 106(2) (2)Scientific journal
- Jul. 2022, Physical Review D, 106(2) (2)Scientific journal
- Jul. 2022, European Physical Journal C, 82(7) (7)Scientific journal
- American Physical Society (APS), May 2022, Physical Review D, 105(10) (10)Scientific journal
- May 2022, Progress of Theoretical and Experimental Physics, 2022(5) (5)Scientific journal
- Abstract MeV gamma-rays provide a unique window for the direct measurement of line emissions from radioisotopes, but observations have made little significant progress since COMPTEL on board the Compton Gamma-ray Observatory (CGRO). To observe celestial objects in this band, we are developing an electron-tracking Compton camera (ETCC) that realizes both bijective imaging spectroscopy and efficient background reduction gleaned from the recoil-electron track information. The energy spectrum of the observation target can then be obtained by a simple ON–OFF method using a correctly defined point-spread function on the celestial sphere. The performance of celestial object observations was validated on the second balloon SMILE-2+ , on which an ETCC with a gaseous electron tracker was installed that had a volume of 30 × 30 × 30 cm3. Gamma-rays from the Crab Nebula were detected with a significance of 4.0σ in the energy range 0.15–2.1 MeV with a live time of 5.1 hr, as expected before launch. Additionally, the light curve clarified an enhancement of gamma-ray events generated in the Galactic center region, indicating that a significant proportion of the final remaining events are cosmic gamma-rays. Independently, the observed intensity and time variation were consistent with the prelaunch estimates except in the Galactic center region. The estimates were based on the total background of extragalactic diffuse, atmospheric, and instrumental gamma-rays after accounting for the variations in the atmospheric depth and rigidity during the level flight. The Crab results and light curve strongly support our understanding of both the detection sensitivity and the background in real observations. This work promises significant advances in MeV gamma-ray astronomy.American Astronomical Society, May 2022, The Astrophysical Journal, 930(1) (1), 6 - 6Scientific journal
- Oxford University Press (OUP), Jun. 2021, Progress of Theoretical and Experimental Physics, 2021(6) (6)
Abstract NEWAGE is a direction-sensitive dark matter search using a low-pressure gaseous time projection chamber. A low alpha-ray emission rate micro pixel chamber had been developed in order to reduce background for dark matter search. We conducted the dark matter search at the Kamioka Observatory in 2018. The total live time was 107.6 d, corresponding to an exposure of 1.1 kg$\>$d. Two events remained in the energy region of 50–60 keV, which was consistent with the expected background of 2.5 events. A directional analysis was carried out and no significant forward–backward asymmetry derived from the WIMP-nucleus elastic scatterings was found. Thus a 90$\%$ confidence level upper limit on the spin-dependent WIMP-proton cross-section of 50 pb for a WIMP mass of 100 GeV$\>c^{-2}$ was derived. This limit is the most stringent yet obtained from direction-sensitive dark matter search experiments.Scientific journal - Elsevier BV, May 2021, Astroparticle Physics, 129, 102568 - 102568Scientific journal
- Apr. 2021, European Physical Journal C, 81(4) (4)Scientific journal
- SPIE, Dec. 2020, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma RayInternational conference proceedings
- Abstract The first directional dark matter search with three-dimensional tracking with head–tail sensitivity (3D-vector tracking analysis) was performed with a gaseous three-dimensional tracking detector, or the NEWAGE-0.3b’ detector. The search was carried out from 2013 July to 2017 August (Run14 to Run18) at the Kamioka underground laboratory. The total livetime is 434.85 d, corresponding to an exposure of 4.51 kg$\>$d. A 90 % confidence level upper limit on spin-dependent WIMP-proton cross-section of $4.3\times10^{2}$ pb for WIMPs with the mass of 150 GeV$\>c^{-2}$ is obtained.Oxford University Press (OUP), Nov. 2020, Progress of Theoretical and Experimental Physics, 2020(11) (11)Scientific journal
- Nov. 2020, Journal of Cosmology and Astroparticle Physics, 2020(11) (11)Scientific journal
- Oct. 2020, Physical Review D, 102(7) (7)Scientific journal
- Elsevier BV, Oct. 2020, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 977, 164285 - 164285[Refereed]Scientific journal
- Aug. 2020, European Physical Journal C, 80(8) (8)Scientific journal
- Institute of Physics Publishing, Jul. 2020, Journal of Instrumentation, 15(7) (7), EnglishScientific journal
- Institute of Physics Publishing, Jun. 2020, Journal of Physics: Conference Series, 1498(1) (1), EnglishInternational conference proceedings
- IOP Publishing, Apr. 2020, Journal of Physics: Conference Series, 1498, 012002 - 012002Scientific journal
- Apr. 2020, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 958(162803) (162803), EnglishAXEL: High-pressure Xe gas TPC for BG-free 0v2b decay search[Refereed]International conference proceedings
- Institute of Physics Publishing, Mar. 2020, Journal of Physics: Conference Series, 1468(1) (1), EnglishInternational conference proceedings
- Mar. 2020, Journal of Physics: Conference Series, 1468(1) (1)International conference proceedings
- Mar. 2020, Progress of Theoretical and Experimental Physics, 2020(3) (3), 033H01 - 033H01, English[Refereed]Scientific journal
- Feb. 2020, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 953Scientific journal
- Abstract For noble gas Time Projection Chambers (TPCs) in the field of rare event searches, operation of high voltage to generate an electric field is a key point. We designed a new structure of electrodes to shape a strong and uniform drift field without electric discharge, in which electrodes of two different radius are used. We also developed Cockcroft-Walton voltage multiplier as a high voltage generator inside a pressure vessel. We achieved −30.0 kV output and examined such kind of voltage generator is feasible as a high voltage supplier in a TPC.IOP Publishing, Feb. 2020, Journal of Physics: Conference Series, 1468(1) (1), 012151 - 012151Scientific journal
- Institute of Physics Publishing, Jan. 2020, Journal of Physics: Conference Series, 1342(1) (1), EnglishInternational conference proceedings
- Discrimination of anisotropy in dark matter velocity distribution with directional detectorsDirectional detection of dark matter has sensitivity for both recoil energyJan. 2020, Physics of the Dark Universe, 27(January 2020) (January 2020), 100426
and direction of nuclear recoil. It opens the way to measure local velocity
distribution of dark matter. In this paper, we study possibility to
discriminate isotropic distribution and anisotropic one suggested by a N-body
simulation with directional detector. Numerical simulation is performed for two
cases according to the detectors, one corresponds to angular histogram and the
other is energy-angular distribution of the signals. We reveal that the
anisotropy of velocity distribution can be discriminated at 90% C.L. with
chi-squared test if O($10^4$) signals are obtained.[Refereed]Scientific journal - Jan. 2020, Japanese Journal of Applied Physics, 59(1) (1)Scientific journal
- 2020, 16TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2019), 1468, EnglishInternational conference proceedings
- Science Direct, Jul. 2019, Physics Letters B, Vol.795, 303 - 308, English[Refereed]Scientific journal
- Jun. 2019, PTEP, Volume 2019, Issue 6, June 2019, 063H01, 2019(6) (6), English[Refereed]Scientific journal
- Apr. 2019, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 922, 171 - 176, English[Refereed]Scientific journal
- Feb. 2019, PHYSICS LETTERS B, 789, 45 - 53, English[Refereed]Scientific journal
- Jan. 2019, JINST, 14(01) (01), T01008, English[Refereed]Scientific journal
- The Physical Society of Japan, 2019, Meeting Abstracts of the Physical Society of Japan, 74.2, 271 - 271, Japanese
- Dec. 2018, PHYSICS LETTERS B, 787, 153 - 158, English[Refereed]Scientific journal
- Dec. 2018, JOURNAL OF INSTRUMENTATION, 13(12) (12), English[Refereed]Scientific journal
- Dec. 2018, JOURNAL OF INSTRUMENTATION, 13(12) (12), P12032, English[Refereed]Scientific journal
- Nov. 2018, 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - ProceedingsInternational conference proceedings
- Jul. 2018, JOUNAL OF INSTRUMENTATION, 13, P07015, English[Refereed]Scientific journal
- American Physical Society, May 2018, Physical Review D, 97(10) (10), English[Refereed]Scientific journal
- Elsevier B.V., Mar. 2018, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 884, 157 - 161, English[Refereed]Scientific journal
- EDP Sciences, Feb. 2018, EPJ Web of Conferences, 174, 02006, English[Refereed]International conference proceedings
- 2018, Low Radioactivity Techniques 2017 (Lrt 2017), 1921, English[Refereed]International conference proceedings
- Jan. 2018, The bulletin of National Institute of Technology, Niihama College, 54(1) (1), 11 - 14[Refereed]
- {EDP} Sciences, 2018, EPJ Web of Conferences, 174, 02010, English[Refereed]
- 2018, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2018(5) (5), English[Refereed]Scientific journal
- Dec. 2017, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 875, 185 - 192, English[Refereed]Scientific journal
- IEEE, Oct. 2017, 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)International conference proceedings
- Oct. 2017, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, (10) (10), English[Refereed]Scientific journal
- Apr. 2017, ASTROPHYSICAL JOURNAL, 839(1) (1), English[Refereed]Scientific journal
- Mar. 2017, ASTROPARTICLE PHYSICS, 89, 51 - 56, English[Refereed]Scientific journal
- Feb. 2017, Scientific Reports, 7, 41511, English[Refereed]Scientific journal
- Feb. 2017, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 845, 394 - 397, English[Refereed]Scientific journal
- Nov. 2016, PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 662, 1 - 46, English[Refereed]Scientific journal
- Oct. 2016, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 834, 192 - 196, English[Refereed]Scientific journal
- Aug. 2016, PHYSICS LETTERS B, 759, 64 - 68, English[Refereed]Scientific journal
- Aug. 2016, PHYSICS LETTERS B, 759, 272 - 276, English[Refereed]Scientific journal
- The Physical Society of Japan (JPS), 2016, Meeting Abstracts of the Physical Society of Japan, 71, 154 - 154, Japanese
- The Physical Society of Japan, 2016, Meeting Abstracts of the Physical Society of Japan, 71, 85 - 85, Japanese
高圧XeガスTPCを用いた0!LaTeX$0{\nu \beta \beta}$崩壊探索実験であるAXEL実験では、次期プロトタイプとして1000~2000chほどのmppcを用いた検出器の製作を予定しており、それに向けてフロントエンドボードの開発を行っている。デザインしたフロントエンドボードのシミュレーションと、試作機の性能評価の結果について報告する。
- 2016, SPACE TELESCOPES AND INSTRUMENTATION 2016: ULTRAVIOLET TO GAMMA RAY, 9905, English[Refereed]International conference proceedings
- 2016, JPS Conf. Proc., 11, 040002, English[Refereed]Scientific journal
- 2016, JPS Conf. Proc., 11, 040001, English"Radiation Detectors for Direct Dark Matter Search"[Refereed]Scientific journal
- Nov. 2015, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 800, 40 - 50, English[Refereed]Scientific journal
- Sep. 2015, ASTROPHYSICAL JOURNAL, 810(1) (1), English[Refereed]Scientific journal
- {IOP} Publishing, Aug. 2015, The Astrophysical Journal, 810(1) (1), 28[Refereed]
- Jun. 2015, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 784, 499 - 503, English[Refereed]Scientific journal
- Apr. 2015, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2015(4) (4), 1, English[Refereed]Scientific journal
- Proceedings of Science (PoS), 2015, Proceedings of Science, 25-29-, EnglishAXEL: A high pressure Xe gas TPC for neutrinoless double beta decay searchInternational conference proceedings
- Jan. 2015, JOURNAL OF INSTRUMENTATION, 10, C01053, English[Refereed]Scientific journal
- 2015, 13TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS, TAUP 2013, 61, 737 - 741, English[Refereed]International conference proceedings
- Sep. 2014, PHYSICAL REVIEW LETTERS, 113(12) (12), 1 - 121301, English[Refereed]Scientific journal
- Jun. 2014, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 6(6) (6), 063C01, English[Refereed]Scientific journal
- May 2014, JOURNAL OF INSTRUMENTATION, 9(5) (5), C05045, English[Refereed]Scientific journal
- Mar. 2014, JPS Conference Proceedings, 1, 130099, English[Refereed]
- The Physical Society of Japan, 2014, Meeting Abstracts of the Physical Society of Japan, 69.1.1, 69, Japanese
- 2014, SPACE TELESCOPES AND INSTRUMENTATION 2014: ULTRAVIOLET TO GAMMA RAY, 9144, English[Refereed]International conference proceedings
- Institute of Physics Publishing, 2014, Journal of Physics: Conference Series, 502(1) (1), English[Refereed]International conference proceedings
- Dec. 2013, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 732, 591 - 594, English[Refereed]Scientific journal
- Oct. 2013, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 726, 155 - 161, English[Refereed]Scientific journal
- Oct. 2013, Journal of Instrumentation, 8(10) (10), English[Refereed]International conference proceedings
- Jul. 2013, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 716, 78 - 85, English[Refereed]Scientific journal
- Jul. 2013, PHYSICS LETTERS B, 724(1-3) (1-3), 46 - 50, English[Refereed]Scientific journal
- Feb. 2013, PHYSICS LETTERS B, 719(1-3) (1-3), 78 - 82, English[Refereed]Scientific journal
- Feb. 2013, PHYSICS LETTERS B, 719(1-3) (1-3), 78 - 82, English[Refereed]Scientific journal
- 2013, 2013 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC), EnglishPrecise Low-Energy Electron Tracking Using a Gaseous Time Projection Chamber for the Balloon-Borne Gamma Ray Compton Telescope[Refereed]International conference proceedings
- Jan. 2013, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 697, 23 - 31, English[Refereed]Scientific journal
- Institute of Physics Publishing, 2013, Journal of Physics: Conference Series, 469(1) (1), EnglishInternational conference proceedings
- May 2012, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 674, 1 - 7, English[Refereed]Scientific journal
- Mar. 2012, JOURNAL OF INSTRUMENTATION, 7(3) (3), English[Refereed]Scientific journal
- Mar. 2012, Current Applied Physics, 12(2) (2), 364 - 368, English[Refereed]Scientific journal
- Mar. 2012, JINST, 7 C02023, EnglishLow pressure gas study for a direction-sensitive dark matter search experiment with MPGD[Refereed]Scientific journal
- Feb. 2012, JOURNAL OF INSTRUMENTATION, 7, C02023, English[Refereed]Scientific journal
- Feb. 2012, JOURNAL OF INSTRUMENTATION, 7(2) (2), English[Refereed]Scientific journal
- Feb. 2012, JOURNAL OF INSTRUMENTATION, 7, English[Refereed]Scientific journal
- 2012, IEEE Nuclear Science Symposium Conference Record, 393 - 399, English[Refereed]International conference proceedings
- 2012, CYGNUS 2011: THIRD INTERNATIONAL CONFERENCE ON DIRECTIONAL DETECTION OF DARK MATTER, 53, 33 - +, English[Refereed]International conference proceedings
- 2012, 12TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2011), PTS 1-6, 375(PART 2) (PART 2), English[Refereed]International conference proceedings
- 2012, IEEE Nuclear Science Symposium Conference Record, 1215 - 1221, English[Refereed]International conference proceedings
- Jan. 2012, JOURNAL OF INSTRUMENTATION, 7(1) (1), English[Refereed]Scientific journal
- 2012, SPACE TELESCOPES AND INSTRUMENTATION 2012: ULTRAVIOLET TO GAMMA RAY, 8443, English[Refereed]International conference proceedings
- 2012, NIMA, 674, 1, EnglishNeutron imaging detector based on the μPIC micro-pixel chamber[Refereed]Scientific journal
- May 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 633(SUPPL. 1) (SUPPL. 1), S36 - S39, English[Refereed]Scientific journal
- May 2011, ASTROPHYSICAL JOURNAL, 733(1) (1), English[Refereed]Scientific journal
- Apr. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 636(1 SUPPL.) (1 SUPPL.), S231 - S236, English[Refereed]Scientific journal
- Feb. 2011, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 628(1) (1), 150 - 153, English[Refereed]International conference proceedings
- Feb. 2011, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 628(1) (1), 158 - 161, English[Refereed]Scientific journal
- 2011, Proceedings of the 25th Workshop on Radiation Detectors and Their Uses, 189 - 195Response of a prototype position-sensitive tissue-equivalent proportional chamber to heavy ions with energies of several hundreds of MeV/nInternational conference proceedings
- 2011, 2011 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC), 1215 - 1221, EnglishSimulation Study for the Higher Sensitivity of an Electron-Tracking Compton Camera at over 1 MeV[Refereed]International conference proceedings
- Institute of High Energy Physics, 2011, Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011, 9, 183 - 186, English[Refereed]International conference proceedings
- 2011, 20TH ESA SYMPOSIUM ON EUROPEAN ROCKET AND BALLOON PROGRAMMES AND RELATED RESEARCH, 700, 567 - 571, EnglishSMILE-II: OBSERVATION OF CELESTIAL AND ATMOSPHEREIC MEV GAMMA RAYS USING A BALLOON-BORNE WIDE FIELDS OF VIEW ELECTRON-TRACKING COMPTON CAMERA[Refereed]International conference proceedings
- 2011, 2011 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC), 393 - 399, English[Refereed]International conference proceedings
- Dec. 2010, KEK Proc, (2010-10) (2010-10), 172 - 178, EnglishPresent Status of Position-Sensitive Tissue Equivalent Proportional Chamber (PS-TEPC)
- Nov. 2010, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 623(1) (1), 606 - 607, English[Refereed]International conference proceedings
- Nov. 2010, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 623(1) (1), 249 - 251, English[Refereed]Scientific journal
- Result and Prospect for Balloon-Borne Experiments of Sub-MeV and MeV Gamma-ray Astronomy using an Electron-Tracking Compton CameraWe developed the Electron-Tracking Compton Camera (ETCC) with reconstructing the track of a recoil electron in Compton process for both sub-MeV and MeV gamma rays to explore MeV gamma-ray astronomy in space. By adding the direction of a recoil electron to Compton reconstruction method, the direction of the incident gamma ray is determined for each individual photon. Also, an angle between the recoil electron and scattered gamma ray is powerful for the kinematical background-rejection. Since MeV gamma-ray astronomy has suffered from huge background so far, this new method is expected to increase the sensitivity. In the simulation, a 50 cm cubic ETCC would provide about 10 times better sensitivity than that of COMPTEL for one year observation in space. As a first step, we observed diffuse cosmic and atmospheric gamma rays at balloon altitudes with an ETCC consisting of the 10 cm cubic Time Projection Chamber (μ-TPC) and the GSO crystal pixel arrays surrounding the μ-TPC (SMILE-I). This instrument was launched on 1st September, 2006 from the Sanriku Balloon Center, and we successfully carried out about 3-hour observation time at an altitude of 32-35 km, and consequently obtained the both gamma-ray spectra between 0.1 and 1 MeV. In addition, this result indicates that the expected detection sensitivity of a future SMILE experiment between 150 keV and 20 MeV would provide a ten times better sensitivity than those of other missions at around 1 MeV. For the next balloon-borne experiment, we are developing a larger ETCC for detecting sub-MeV gamma rays from celestial point sources such as Crab and Cygnus X-1 during a few hours observation.Japan Aerospace Exploration Agency, Mar. 2010, 宇宙航空研究開発機構研究開発報告 JAXA-RR-, 9(09-007) (09-007), 19 - 30, Japanese
- Mar. 2010, PHYSICS LETTERS B, 686(1) (1), 11 - 17, English[Refereed]Scientific journal
- 2010, 2010 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD (NSS/MIC), 2844 - 2847, EnglishImaging Study of a Phantom and Small Animal with a Two-Head Electron-Tracking Compton Gamma-Ray Camera[Refereed]International conference proceedings
- 2010, IEEE Nuclear Science Symposium Conference Record, 291 - 297, English[Refereed]International conference proceedings
- Jan. 2010, INTERNATIONAL JOURNAL OF MODERN PHYSICS A, 25(1) (1), 1 - 51, English[Refereed]Scientific journal
- 2010, 2010 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD (NSS/MIC), 291 - 297, English[Refereed]International conference proceedings
- 2010, SPACE TELESCOPES AND INSTRUMENTATION 2010: ULTRAVIOLET TO GAMMA RAY, 7732, English[Refereed]International conference proceedings
- Dec. 2009, IEEE Transactions on Nuclear Science, 56(6) (6), 3779 - 3788, English[Refereed]International conference proceedings
- Apr. 2009, ASTROPARTICLE PHYSICS, 31(3) (3), 185 - 191, English[Refereed]Scientific journal
- Mar. 2009, JOURNAL OF SYNCHROTRON RADIATION, 16(2) (2), 231 - 236, English[Refereed]Scientific journal
- 2009, 2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5, 2813 - +, EnglishImaging Reagents Study for Nuclear Medicine Using an Electron-Tracking Compton Gamma-Ray Camera[Refereed]International conference proceedings
- 2009, IEEE Nuclear Science Symposium Conference Record, 1107 - 1112, English[Refereed]International conference proceedings
- 2009, 2008 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (2008 NSS/MIC), VOLS 1-9, 456 - +, English[Refereed]International conference proceedings
- 2009, 2008 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (2008 NSS/MIC), VOLS 1-9, 3212 - +, English[Refereed]International conference proceedings
- 2009, IEEE Nuclear Science Symposium Conference Record, 2437 - 2440, English[Refereed]International conference proceedings
- Physical Society of Japan, 2009, Journal of the Physical Society of Japan, 78(SUPPL. A) (SUPPL. A), 161 - 164, English[Refereed]International conference proceedings
- 2009, 2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5, 1107 - 1112, English[Refereed]International conference proceedings
- 2009, CRAL-IPNL: DARK ENERGY AND DARK MATTER: OBSERVATIONS, EXPERIMENTS AND THEORIES, 36, 243 - +, English[Refereed]International conference proceedings
- 2009, 2008 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (2008 NSS/MIC), VOLS 1-9, 2745 - +, English[Refereed]International conference proceedings
- Jun. 2008, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 591(1) (1), 268 - 271, English[Refereed]Scientific journal
- Observation for the celestial sub-MeV and MeV gamma rays by Electron Tracking Compton CameraWe developed the Electron Tracking Compton Camera (ETCC) with reconstructing the 3-D tracks of the recoil electron in Compton process for both sub-MeV and MeV gamma rays. By measuring both the directions and energies of a scattered gamma ray and a recoil electron, the direction of the incident gamma ray is determined for each individual photon. Also, a residual measured angle between the recoil electron and scattered gamma ray is powerful for the kinematical background-rejection. In order to test the performance of the ETCC for the observation of celestial sub-MeV gamma rays by the balloon- borne experiment, we have constructed the ETCC consisting of the 10 cm cubic Time Projection Chamber (μ-TPC) for 3-D electron tracking and the 6×6×13 mm^3 GSO crystal pixel arrays surrounding the μ-TPC for detecting scattered gamma rays, and also made the balloon-borne instrument to operate the ETCC. This instrument was launched on 1st September, 2006 from Sanriku Balloon Center,and flown during 7 hours. We obtained about 4 hours observation time at the altitude of 32〜35 km.Japan Aerospace Exploration Agency, Feb. 2008, 宇宙航空研究開発機構研究開発報告 JAXA-RR-, 7(07-009) (07-009), 97 - 106, Japanese
- 2008, IEEE Nuclear Science Symposium Conference Record, 3470 - 3474, English[Refereed]International conference proceedings
- 2008, TAUP2007: TENTH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS, 120(Part 4) (Part 4), English[Refereed]International conference proceedings
- 2008, SPACE TELESCOPES AND INSTRUMENTATION 2008: ULTRAVIOLET TO GAMMA RAY, PTS 1 AND 2, 7011, English[Refereed]International conference proceedings
- 2008, Proceedings of Science[Refereed]
- Dec. 2007, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46(12) (12), 7932 - 7938, English[Refereed]Scientific journal
- Oct. 2007, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 581(1-2) (1-2), 110 - 114, English[Refereed]Scientific journal
- Oct. 2007, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 654(3-4) (3-4), 58 - 64, English[Refereed]Scientific journal
- Oct. 2007, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 581(1-2) (1-2), 517 - 521, English[Refereed]Scientific journal
- Oct. 2007, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 580(2) (2), 1031 - 1035, English[Refereed]Scientific journal
- Jun. 2007, NIRS-M (Natl Inst Radiol Sci), (203) (203), 214 - 215, JapaneseResponse of a position-sensitive tissue equivalent proportional counter to heavy ions
- Jun. 2007, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 576(1) (1), 43 - 46, English[Refereed]Scientific journal
- May 2007, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46(5A) (5A), 3101 - 3110, English[Refereed]Scientific journal
- Apr. 2007, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 573(1-2) (1-2), 204 - 207, English[Refereed]Scientific journal
- Apr. 2007, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 573(1-2) (1-2), 115 - 118, English[Refereed]Scientific journal
- Apr. 2007, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 573(1-2) (1-2), 195 - 199, English[Refereed]Scientific journal
- 2007, 2007 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-11, 1826 - +, EnglishDevelopment of Position-sensitive Tissue Equivalent Proportional Chamber for Space DosimetryInternational conference proceedings
- 2007, IEEE Nuclear Science Symposium Conference Record, 3, 1826 - 1829, English[Refereed]International conference proceedings
- 2007, IEEE Nuclear Science Symposium Conference Record, 1, 406 - 410, English[Refereed]International conference proceedings
- 2007, UTNL-R(東京大学大学院工学系研究科原子力専攻), (0457) (0457), 13 - 14, Japanese微細加工技術を用いたガス画像装置μPICの開発・応用
- 2007, UTNL-R(東京大学大学院工学系研究科原子力専攻), (0457) (0457), 39 - 40, Japanese位置有感比例計数管による宇宙放射線線量当量計測器の開発
- 2007, IEEE Nuclear Science Symposium Conference Record, 5, 3395 - 3399, English[Refereed]International conference proceedings
- 2007, IEEE Nuclear Science Symposium Conference Record, 4, 2558 - 2563, English[Refereed]International conference proceedings
- 2007, Proceedings of Science[Refereed]
- 2007, 2007 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-11, 3, 1960 - +, English[Refereed]International conference proceedings
- 2007, IEEE Nuclear Science Symposium Conference Record, 6, 4569 - 4573, English[Refereed]International conference proceedings
- 2007, Proceedings of the 6th International Workshop on the Identification of Dark Matter, IDM 2006, 308 - 313[Refereed]
- Jul. 2006, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 563(1) (1), 49 - 53, English[Refereed]Scientific journal
- May 2006, NIRS-M (Natl Inst Radiol Sci), (192) (192), 249 - 250, JapaneseResponse of a position-sensitive tissue equivalent proportional counter to heavy ions
- 2006, 2006 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOL 1-6, 3860 - 3864, English[Refereed]International conference proceedings
- 2006, 2006 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOL 1-6, 3870 - 3874, English[Refereed]International conference proceedings
- 2006, Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering, 72(11) (11), 1327 - 1330, EnglishElection tracking compton gamma-ray camera for medical imaging[Refereed]
- 2006, 2006 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOL 1-6, 5, 2971 - 2975, English[Refereed]International conference proceedings
- 2006, 2006 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOL 1-6, 1, 406 - 410, English[Refereed]International conference proceedings
- Nov. 2005, JOURNAL OF SYNCHROTRON RADIATION, 12(6) (6), 820 - 825, English[Refereed]Scientific journal
- Jul. 2005, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 546(1-2) (1-2), 258 - 262, English[Refereed]Scientific journal
- Jul. 2005, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 546(3) (3), 457 - 465, English[Refereed]Scientific journal
- Mar. 2005, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 540(2-3) (2-3), 266 - 272, English[Refereed]Scientific journal
- 2005, 2005 IEEE Nuclear Science Symposium Conference Record, Vols 1-5, 371 - 375, EnglishHigh-speed position encoding system for the TPC with micro pixel chamber readout[Refereed]International conference proceedings
- 2005, IEEE Nuclear Science Symposium Conference Record, 5, 2993 - 2997, English[Refereed]International conference proceedings
- 2005, IEEE Nuclear Science Symposium Conference Record, 1, 443 - 447, English[Refereed]International conference proceedings
- 2005, ORIGIN OF MATTER & EVOLUTION OF GALAXIES 2003, 123 - 132, EnglishCurrent status of Tokyo dark matter experiment[Refereed]International conference proceedings
- 2005, ORIGIN OF MATTER & EVOLUTION OF GALAXIES 2003, 537 - 540, EnglishNewage project - With an advanced gaseous tracking device[Refereed]International conference proceedings
- 2005, Identification of Dark Matter, 372 - 377[Refereed]
- 2005, IEEE Nuclear Science Symposium Conference Record, 5, 2998 - 3001, English[Refereed]International conference proceedings
- 2005, IEEE Nuclear Science Symposium Conference Record, 1, 371 - 375, English[Refereed]International conference proceedings
- Dec. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 535(1-2) (1-2), 236 - 241, English[Refereed]Scientific journal
- Oct. 2004, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 51(5) (5), 2140 - 2144, English[Refereed]Scientific journal
- Aug. 2004, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 51(4) (4), 1337 - 1342, English[Refereed]Scientific journal
- Aug. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 529(1-3) (1-3), 373 - 377, English[Refereed]Scientific journal
- Jun. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 525(1-2) (1-2), 20 - 27, English[Refereed]Scientific journal
- Jun. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 525(1-2) (1-2), 107 - 113, English[Refereed]Scientific journal
- Jun. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 525(1-2) (1-2), 28 - 32, English[Refereed]Scientific journal
- Feb. 2004, NEW ASTRONOMY REVIEWS, 48(1-4) (1-4), 263 - 268, English[Refereed]Scientific journal
- 宇宙の質量の大部分を占める暗黒物質の直接探索実験は、1980年台より行なわれているが、末だ発見には至っていない。本研究では方向に感度を持つ検出器を用いて、決定的な暗黒物質検出を目指す。詳細な計算等は参考文献[1]を参考にして頂きたい。素粒子論グループ 素粒子論研究 編集部, 2004, 素粒子論研究, 110(2) (2), B62 - B65, Japanese
- 2004, 2003 IEEE NUCLEAR SCIENCE SYMPOSIUM, CONFERENCE RECORD, VOLS 1-5, 1182 - 1186, EnglishDevelopment of an ASD IC for the Micro Pixel Chamber[Refereed]International conference proceedings
- 2004, 2003 IEEE NUCLEAR SCIENCE SYMPOSIUM, CONFERENCE RECORD, VOLS 1-5, 272 - 276, EnglishDevelopment of an MeV gamma-ray imaging detector[Refereed]International conference proceedings
- 2004, 2004 IEEE Nuclear Science Symposium Conference Record, Vols 1-7, 186 - 189, EnglishCompton gamma-ray imager using electron tracking gaseous TPC and scintillation camera[Refereed]International conference proceedings
- Jan. 2004, PHYSICS LETTERS B, 578(3-4) (3-4), 241 - 246, English[Refereed]Scientific journal
- Jan. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 517(1-3) (1-3), 219 - 225, English[Refereed]Scientific journal
- 2004, NEW X-RAY RESULTS, THE NEXT GENERATION OF X-RAY OBSERVATORIES AND GAMMA RAY BURST AFTERGLOW PHYSICS, 34(12) (12), 2688 - 2690, English[Refereed]Scientific journal
- Nov. 2003, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 513(1-2) (1-2), 277 - 281, English[Refereed]Scientific journal
- Nov. 2003, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 513(1-2) (1-2), 408 - 412, English[Refereed]Scientific journal
- Nov. 2003, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 513(1-2) (1-2), 94 - 98, English[Refereed]Scientific journal
- Aug. 2003, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 50(4) (4), 825 - 830, English[Refereed]Scientific journal
- 2001, DARK MATTER IN ASTRO- AND PARTICLE PHYSICS, 610 - 614, EnglishThe LiF dark matter experiment at Kamioka mine[Refereed]International conference proceedings
- 2001, IDENTIFICATION OF DARK MATTER, 391 - 396, EnglishDark matter search with lithium fluoride at Kamioka[Refereed]International conference proceedings
- Elsevier BV, Oct. 1999, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 436(1-2) (1-2), 233 - 237, English[Refereed]Scientific journal
- Sep. 1999, PHYSICS LETTERS B, 461(4) (4), 371 - 375, English[Refereed]Scientific journal
- Elsevier, 1998, Astroparticle Physics, 9(4) (4), 325 - 329, English[Refereed]Scientific journal
- Exploring the Origin of Galactic Diffuse MeV Gamma Rays with SMILE-3レポート番号: isas24-sbs-026宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS), Oct. 2024, Balloon Symposium: 2024, Japanese
- SMILE-3 : Development of pixel scintillator array and background evaluationレポート番号: isas24-sbs-028宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS), Oct. 2024, Balloon Symposium: 2024, Japanese
- 2024, 日本物理学会講演概要集(CD-ROM), 79(1) (1)SMILE-72: Development of Gas TPC Towards Increased Sensitivity and Stability
- 2023, 日本物理学会講演概要集(CD-ROM), 78(1) (1)Background study with water Cherenkov techniques in XENONnT
- 2023, 日本物理学会講演概要集(CD-ROM), 78(1) (1)Current status of XENONnT
- 2023, 日本物理学会講演概要集(CD-ROM), 78(2) (2)Next Generation Direct Dark Matter Search with the DARWIN/XLZD experiment
- 2022, 日本物理学会講演概要集(CD-ROM), 77(2) (2)XENONnT: measurement of environmental tritium for further understanding of low energy ER background (2)
- Efforts for long-term operation of a space dosimeter named PS-TEPCSpace Utilization Research (January 19-20, 2021. Online Meeting)Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Jan. 2021, 宇宙環境利用シンポジウム 第35回: 令和二年度 = Space Utilization Research, Vol. 35 2020: Proceedings of The Thirty-fifth Space Utilization Symposium, (35) (35), Japanese
- Present status of space dosimetry and its prospectSpace Utilization Research (January 21-22, 2020. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa JapanG-09Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Jan. 2020, 宇宙環境利用シンポジウム 第34回: 令和元年度 = Space Utilization Research, Vol. 34 2019: Proceedings of The Thirty-fourth Space Utilization Symposium, (34) (34), Japanese
- 2020, 量子科学技術研究開発機構研究報告書(Web), (17) (17)Response of a position-sensitive tissue equivalent proportional counter to heavy ions
- SMILE-2+バックグラウンド事象の研究大気球シンポジウム 2019年度(2019年11月7-8日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県著者人数: 19名著者の誤記: 庄司, 泰弘資料番号: SA6000140021宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2019, 大気球シンポジウム: 2019年度 = Balloon Symposium: 2019, Japanese
- SMILE+における銀河中心領域の観測大気球シンポジウム 2019年度(2019年11月7-8日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県著者人数: 18名資料番号: SA6000140022宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2019, 大気球シンポジウム: 2019年度 = Balloon Symposium: 2019, Japanese
- SMILE-2+における高エネルギー事象解析状況報告大気球シンポジウム 2019年度(2019年11月7-8日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県著者人数: 19名資料番号: SA6000140023宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2019, 大気球シンポジウム: 2019年度 = Balloon Symposium: 2019, Japanese
- Apr. 2019, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 924, 448 - 451, English[Refereed]
- Mar. 2019, 日本物理学会第74回年次大会SMILE45:電子飛跡検出型コンプトンカメラにおける電子のTPC脱出事象解析法とガンマ線応答評価
- Present Status of Development for the Domestic Space DosimetersSpace Utilization Research (January 24-25, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa JapanInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Jan. 2019, 宇宙環境利用シンポジウム 第33回: 平成30年度 = Space Utilization Research, Vol. 33 2018: Proceedings of The Thirty-third Space Utilization Symposium, (33) (33), Japanese
- 2019, 量子科学技術研究開発機構研究報告書(Web), (13) (13)位置有感比例計数管の重イオンに対する応答
- SMILE-2+実験実施報告大気球シンポジウム 平成30年度(2018年11月1-2日. 宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)), 相模原市, 神奈川県著者人数: 18名資料番号: SA6000128019宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2018, 大気球シンポジウム: 平成30年度 = Balloon Symposium: 2018, Japanese
- SMILE-2+ガンマ線望遠鏡ETCCの性能評価大気球シンポジウム 平成30年度(2018年11月1-2日. 宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)), 相模原市, 神奈川県著者人数: 19名資料番号: SA6000128020宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2018, 大気球シンポジウム: 平成30年度 = Balloon Symposium: 2018, Japanese
- SMILE-2+フライトデータ解析状況報告大気球シンポジウム 平成30年度(2018年11月1-2日. 宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)), 相模原市, 神奈川県著者人数: 18名資料番号: SA6000128021宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2018, 大気球シンポジウム: 平成30年度 = Balloon Symposium: 2018, Japanese
- Sep. 2018, 日本天文学会2018年秋季年会SMILE実験計画と2018年豪州気球実験SMILE-2+
- 20 Aug. 2018, 日本天文学会年会講演予稿集, 2018, 230, JapaneseSMILE‐2+軟ガンマ線望遠鏡による2018年豪州気球実験の初期解析
- 20 Aug. 2018, 日本天文学会年会講演予稿集, 2018, 225, JapaneseSMILE‐2+:広視野MeVガンマ線望遠鏡の性能評価と2018年豪州気球実験
- 21 Feb. 2018, EPJ Web of Conferences, 174
- Space dosimetry with a three-dimensional gas tracking detectorSpace Utilization Research (January 15-16, 2018. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa JapanInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Jan. 2018, 宇宙環境利用シンポジウム 第32回: 平成29年度 = Space Utilization Research, Vol. 32 2017: Proceedings of The Thirty-second Space Utilization Symposium, (32) (32), Japanese
- SPIE, 01 Jan. 2018, Proceedings of SPIE - The International Society for Optical Engineering, 10699
- US Cosmic Visions: New Ideas in Dark Matter 2017: Community ReportThis white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in15 Jul. 2017
Dark Matter" held at University of Maryland on March 23-25, 2017.Technical report - Mar. 2017, 日本天文学会2017年春季年会SMILE-2+気球実験計画と軟ガンマ線撮像分光器の改良
- Development of Position Sensitive Tissue Equivalent Proportional Chamber (PS-TEPC) as an active space dosimeterSpace Utilization Research (January 16-17, 2017. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa JapanInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Jan. 2017, 宇宙環境利用シンポジウム 第31回: 平成28年度 = Space Utilization Research, Vol. 31 2016: Proceedings of The Thirty-first Space Utilization Sysmposium, (31) (31), Japanese
- Sep. 2016, 日本天文学会2016年秋季年会MeVガンマ線撮像カメラETCCの改良と南半球気球実験計画
- Mar. 2016, 日本天文学会2016年春季年会MeVガンマ線超広角撮像カメラによるIa型超新星の起源解明可能性
- Mar. 2016, 日本物理学会第71回年次大会核ガンマ線全天撮像分光で探るIa型超新星の起源
- Feb. 2016, 宇宙核物理連絡協議会研究会全天イメージング核分光によるIa型超新星の爆発起源探査
- Development of Position Sensitive Tissue Equivalent Proportional Chamber(PS-TEPC) for Space Dosimetry on board the International Space StationSpace Utilization Research (January 19-20, 2016. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa JapanInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Jan. 2016, 宇宙環境利用シンポジウム 第30回: 平成27年度 = Space Utilization Research, Vol. 30 2015: Proceedings of The Thirtieth Space Utilization Symposium, (30) (30), Japanese
- 01 Jan. 2016, Proceedings of Science, Part F128556
- Sep. 2015, GRB workshop 2015, EnglishTrue imaging trigger for GRBs by Electron-Tracking Compton Camera with a well-defined PSF
- Jul. 2015, 14th Marcel Grossmann Meeting, EnglishAn Observational Key to SN Ia Progenitors: MeV All-Sky Survey
- 位置有感型比例計数箱PS-TEPCフライトモデルの開発(Ⅱ)第62回応用物理学会春季学術講演会(2015年3月11日-14日. 東海大学湘南キャンパス), 平塚市, 神奈川県資料番号: AC1500089000レポート番号: 11p-A19-1応用物理学会, Mar. 2015, 第62回応用物理学会春季学術講演会, Japanese
- Development of Position Sensitive Tissue Equivalent Proportional Chamber (PS-TEPC) and establishment of a technique for space dosimetry on the International Space Station (2014RT report)Space Utilization Research (January 24-25, 2015. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa JapanInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Jan. 2015, 宇宙環境利用シンポジウム 第29回: 平成26年度 = Space Utilization Research, Vol. 29 2014: Proceedings of The Twenty-ninth Space Utilization Symposium, (29) (29), 61 - 63, Japanese
- 2015, Proceedings of Science, 30-July-2015Balloon-borne experiment for deep sky survey of MeV gamma rays using an electron-tracking Compton camera
- Sep. 2014, 日本天文学会2014年秋季年会広視野低雑音MeVガンマ線コンプトンカメラを用いたSMILE-IIシステムの改良
- The Physical Society of Japan (JPS), 22 Aug. 2014, Meeting abstracts of the Physical Society of Japan, 69(2) (2), 23 - 23, Japanese19pSH-10 Development of Resistive GEM using sputtering carbon
- Mar. 2014, 日本天文学会2014年春季年会軟ガンマ線撮像気球実験SMILE-II搭載の電子飛跡検出型コンプトンカメラの改良
- 2014, 2014 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC), English
- Nov. 2013, The 4th Symposimum on Polar Science, EnglishObservation of Gamma-Rays from Relativistic Electron Precipitation with Balloon Experiment around the Polar Regions
- Sep. 2013, 日本天文学会2013年秋季年会MeVガンマ線全天探査に向けた第二次気球実験SMILE-II計画
- We have developed a prototype time-resolved neutron imaging detectorThe Japanese Society for Neutron Science, 21 May 2013, hamon, 23(3) (3), 218 - 222, Japanese
employing a micro-pattern gaseous detector known as the micro-pixel chamber
({\mu}PIC) coupled with a field-programmable-gate-array-based data acquisition
system. Our detector system combines 100{\mu}m-level spatial and sub-{\mu}s
time resolutions with a low gamma sensitivity of less than 10^-12 and high data
rates, making it well suited for applications in neutron radiography at
high-intensity, pulsed neutron sources. In the present paper, we introduce the
detector system and present several test measurements performed at NOBORU
(BL10), J-PARC to demonstrate the capabilities of our prototype. We also
discuss future improvements to the spatial resolution and rate performance.Technical report - The Physical Society of Japan (JPS), 26 Mar. 2013, Meeting abstracts of the Physical Society of Japan, 68(1) (1), 147 - 147, English26aXZB-9 Recent Results for the μPIC Neutron Imaging Detector with DAQ Upgrade
- Mar. 2013, 高エネルギーニュース, 31, Japanese方向に感度を持つ暗黒物質探索実験 NEWAGEIntroduction other
- 2013, IEEE Nuclear Science Symposium Conference Record
- 2013, 日本中性子科学会誌「波紋」, 23, 218 - 222μPIC(Micro-Pixel Chamber)を用いた中性子イメージング検出器の開発
- The Physical Society of Japan (JPS), 24 Aug. 2012, Meeting abstracts of the Physical Society of Japan, 67(2) (2), 23 - 23, Japanese13pSG-1 R&D of spark suppression μ-PIC with resistive cathode
- The Physical Society of Japan (JPS), 05 Mar. 2012, Meeting abstracts of the Physical Society of Japan, 67(1) (1), 37 - 37, Japanese26pFB-13 Development of the resistive μ-PIC and equipped with, readout strips embedded in polyimide base
- 2012, Proceedings of the 26th Workshop on Radiation Detectors and Their Uses, 1 - 7, EnglishResponse of PS-TEPC filled with propane based tissue-equivalent gas to proton beam with energy of 230 MEV[Refereed]
- The Physical Society of Japan (JPS), 24 Aug. 2011, Meeting abstracts of the Physical Society of Japan, 66(2) (2), 984 - 984, English22aJA-9 Neutron Imaging Detector Based on the μPIG Micro-Pixel Gaseous Chamber
- The Physical Society of Japan (JPS), 03 Mar. 2011, Meeting abstracts of the Physical Society of Japan, 66(1) (1), 963 - 963, English25pTN-4 Performance of a Neutron Imaging Detector Based on the μPIC Micro-Pixel Gaseous Chamber
- 応用物理学会放射線分科会, 01 Nov. 2010, Ionizing radiation., 36(4) (4), 169 - 178, JapanesePerformance of Micro Pixel Chamber (μPIC) in Small Angle X-ray scattering
- Jul. 2010, 38th COSPAR, EnglishObservation of sub-MeV gamma rays with an Electron Tracking Compton Telescope using a gaseous TPC at balloon altitudes[Refereed]
- The Physical Society of Japan (JPS), 01 Mar. 2010, Meeting abstracts of the Physical Society of Japan, 65(1) (1), 1012 - 1012, English23aHT-9 Development of a Neutron Imaging Detector Based on the μPIC Micro-Pixel Gaseous Chamber
- 2010, IEEE Nuclear Science Symposium Conference Record, 2844 - 2847, English[Refereed]
- Mar. 2009, Joint Gamma-Ray Mission Meeting 2009, EnglishElectron-Tracking Compton Telescope Based on Gaseous TPC ans a Scintillation Camera
- 2009, 2008 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (2008 NSS/MIC), VOLS 1-9, 3181 - +, EnglishAdvanced Compton Camera System for Nuclear Medicine: Prototype System Study[Refereed]
- 2009, 2009 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-5, 2437 - +, EnglishStudy on the Use of Electron-Tracking Compton Gamma-Ray Camera to Monitor the Therapeutic Proton Dose Distribution in Real Time[Refereed]
- 2009, IEEE Nuclear Science Symposium Conference Record, 2813 - 2816, English[Refereed]
- Oct. 2008, EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING, 35, S339 - S340, EnglishCompton scattering-based gamma-ray detector (Compton camera): an outline of detector equippment and a peformance characteristicSummary international conference
- 05 Jun. 2008, 薬学雑誌, 128(Suppl.1) (Suppl.1), 48, EnglishMulti Nuclides Simultaneous imaging with the Electron Tracking Compton Camera
- The Physical Society of Japan (JPS), 29 Feb. 2008, Meeting abstracts of the Physical Society of Japan, 63(1) (1), 923 - 923, Japanese24aWG-9 Performance evaluation of a 2-D imaging gas detector based on a μPIC with a wide dynamic range
- 2008, IEEE Nuclear Science Symposium Conference Record, 1181 - 1185, English
- 2008, IEEE Nuclear Science Symposium Conference Record, 3937 - 3941, English
- 2008, IEEE Nuclear Science Symposium Conference Record, 3906 - 3908, English[Refereed]
- The Physical Society of Japan (JPS), 21 Aug. 2007, Meeting abstracts of the Physical Society of Japan, 62(2) (2), 74 - 74, Japanese22aYF-8 Response of a Micro Pixel Chamber for heavy ion irradiation
- 応用物理学会, 10 Jun. 2007, 應用物理, 76(6) (6), 636 - 640, JapaneseDevelopment of micropixel gas chamber and its application to MeV gamma-ray imaging
- The Physical Society of Japan (JPS), 28 Feb. 2007, Meeting abstracts of the Physical Society of Japan, 62(1) (1), 940 - 940, Japanese18pXC-4 Development of imaging photon-counting detector based on micro pixel gas detector and its application for wide dynamic range X-ray scattering experiments (1)
- 2007, 2007 IEEE NUCLEAR SCIENCE SYMPOSIUM CONFERENCE RECORD, VOLS 1-11, 5, 3395 - +, EnglishDiagnostic approach of using an electron tracking compton gamma-ray camera based on small animal and phantom experiments[Refereed]Introduction scientific journal
- 2007, IEEE Nuclear Science Symposium Conference Record, 5, 2971 - 2975, English
- 2007, Proceedings of the 21st Workshop on Radiation Detectors and Their Uses, 213 - 219, EnglishDevelopment of drift cage for PS-TEPC[Refereed]
- 2007, Proceedings of the 21st Workshop on Radiation Detectors and Their Uses, 49 - 55, EnglishDevelopment and applications of a μ-PIC[Refereed]
- 2006, HIGH ENERGY, OPTICAL, AND INFRARED DETECTORS FOR ASTRONOMY II, 6276, English[Refereed]
- The Physical Society of Japan (JPS), 04 Mar. 2005, Meeting abstracts of the Physical Society of Japan, 60(1) (1), 163 - 163, Japanese25pYJ-13 Development-of Position Sensitive Tissue Equivalent Proportional Chamber
- 宇宙科学研究所, 06 Jan. 2005, 宇宙科学シンポジウム, 5, 293 - 296, Japanese広視野ガンマ線カメラによるMeVガンマ線天体探査
- 2005, 2005 IEEE Nuclear Science Symposium Conference Record, Vols 1-5, 5, 2993 - 2997, English[Refereed]
- 2005, 2005 IEEE Nuclear Science Symposium Conference Record, Vols 1-5, 1, 443 - 447, English[Refereed]
- 01 Dec. 2004, IEEE Nuclear Science Symposium Conference Record, 1, 186 - 189
- The Physical Society of Japan (JPS), 03 Mar. 2004, Meeting abstracts of the Physical Society of Japan, 59(1) (1), 17 - 17, Japanese27pZD-6 Development of Large Area Micro Pixel Chamber 4
- 01 Dec. 2003, IEEE Nuclear Science Symposium Conference Record, 1, 272 - 276
- 01 Dec. 2003, IEEE Nuclear Science Symposium Conference Record, 2, 1182 - 1186
- Oct. 2003, PHYSICS LETTERS B, 572(3-4) (3-4), 145 - 151, English
- Apr. 2003, ASTROPARTICLE PHYSICS, 19(1) (1), 135 - 144, English
- The Physical Society of Japan (JPS), 06 Mar. 2003, Meeting abstracts of the Physical Society of Japan, 58(1) (1), 26 - 26, JapaneseCharged particle tracking experiment using the Micro Pixel Chamber
- 2003, 2002 IEEE NUCLEAR SCIENCE SYMPOSIUM, CONFERENCE RECORD, VOLS 1-3, 1, 297 - 301, EnglishPerformance of the TPC with micro pixel chamber readout: micro-TPC
- 2003, 日本天文学会年会講演予稿集, 2003, 228, Japanese位置分解型ガス検出器μ‐PICを用いたX線偏光測定のエネルギーおよびガス依存性
- 2002, 日本天文学会年会講演予稿集, 2002, 261, Japanese次期X線天文衛星「NeXT」搭載予定透過型X線CCDの性能評価
- 応用物理学会,放射線分科会, 01 Jan. 2000, Ionizing radiation., 26(1) (1), 23 - 33, JapaneseComposite Bolometer and NTD Thermistor for Dark Matter Detection
- 2021年度第一回CRCタウンミーティング, Aug. 2021, JapaneseNEWAGE/CYGNUSOral presentation
- 3rd KEK-PH + KEK-Cosmo Joint Lectures and Workshop on "Dark Matter", Oct. 2020, EnglishDirect Search of Dark Matter[Invited]Invited oral presentation
- KUBEC International Workshop on Dark Matter Searches 2019, Aug. 2019, English, 神戸大学ブリュッセルオフィス, International conferenceNEWAGE[Invited]Invited oral presentation
- 日本物理学会第74回年次大会, Mar. 2019, Japanese, 日本物理学会, 九州大学, Domestic conference電場形成に高抵抗シートを用いたTPCの開発Oral presentation
- アクティブ媒質TPC開発座談会, Mar. 2019, Japanese, KobeUniversity, Domestic conference抵抗シートを用いたTPC開発[Invited]Invited oral presentation
- Revealing the history of the universe with underground particle and nuclear research 2019, Mar. 2019, English, Tohoku University, Sendai(Japan), International conferenceNEWAGE[Invited]Invited oral presentation
- 平成30年度宇宙線研究所共同利用研究成果発表研究会, Dec. 2018, Japanese, 東京大学宇宙線研究所, 東京大学, Domestic conferenceガス飛跡検出器による暗黒物質探索実験Oral presentation
- 9th symposium on Large TPCs for low-energy rare event detection, Dec. 2018, English, Diderot University, Paris, International conferenceLow BG TPC for direction-sensitive dark matter search[Invited]Invited oral presentation
- 2018年度年度 早稲田大学素粒子物理実験研究会, Nov. 2018, Japanese, 早稲田大学, フォレスト箱根, Domestic conferenceいま、探すべきDM質量領域Public discourse
- Identification of Dark Matter 2018 (IDM 2018), Jul. 2018, English, Brown University, International conferenceReview on Direction-Sensitive Direct Dark Matter Search with gaseous detectors[Invited]Invited oral presentation
- Identification of Dark Matter 2018 (IDM 2018), Jul. 2018, English, Brown University, International conferenceNEWAGE[Invited]Invited oral presentation
- 「極低放射能技術」研究会, Mar. 2018, Japanese, 神戸大学, 山形, Domestic conference低放射能μ-PICの開発Oral presentation
- 日本物理学会2018年春季大会, Mar. 2018, Japanese, 日本物理学会, 東京理科大学, Domestic conference低BG実験のための陰イオンガスTPC[Invited]Invited oral presentation
- 日本物理学会2018年春季大会, Mar. 2018, Japanese, 日本物理学会, 東京理科大学, Domestic conferenceNEWAGE実験48:地下実験報告Oral presentation
- 計画研究B02第10回若手研究会, Jan. 2018, Japanese, 地下素核新学術 計画研究B02, 大阪大学, Domestic conference中性子測定:これまでの神戸大学の取り組みOral presentation
- 第14回MPGD研究会, Dec. 2017, Japanese, 岩手大学, Domestic conference低バックグラウンドなTPCの開発Oral presentation
- 2017年度第二回CRC将来計画タウンミーティング, Dec. 2017, Japanese, 東京大学, 東京大学, Domestic conferenceフッ素を用いた大質量暗黒物質探索Oral presentation
- 平成29年度宇宙線研究所共同利用研究成果発表研究会, Dec. 2017, Japanese, 東京大学宇宙線研究所, 東京大学, Domestic conferenceガス飛跡検出器による暗黒物質探索実験Oral presentation
- Topical Workshop on Dark Matter, Nov. 2017, English, NanYang Technological University, Singapore, International conferenceDirection-Sensitive Direct Dark Matter Search[Invited]Invited oral presentation
- 研究会「宇宙観測と地上実験から探るダークマター研究の現状と展望」, Oct. 2017, Japanese, 石川県, Domestic conference暗黒物質直接探索実験の現状[Invited]Nominated symposium
- The Rencontres du Vietnam on Exploring the Dark Universe, Jul. 2017, English, Centre for Interdisciplinary Science Education (ICISE), Vietnam, International conferenceNEWAGE[Invited]Invited oral presentation
- 2017年度CRC将来計画タウンミーティン, Jun. 2017, Japanese, 東京大学, 東京, Domestic conferenceNEWAGEOral presentation
- CYGNUS 2017 : 6th Workshop on directional detection of Dark Matter, Jun. 2017, English, China, International conferenceCYGNUS GAS WG reportKeynote oral presentation
- Physics in LHC and early universe, 2017, English, 東京大学, 東京大学, International conferenceReview of direction-sensitive dark matter search[Invited]Invited oral presentation
- caastro-coepp joint workshop, 2017, English, School of Physics, University of Melbourne, オーストラリア, International conferenceNEWAGEOral presentation
- 神戸大学梅田インテリジェントラボラトリ, Jan. 2017, Japanese, 神戸大学, 大阪, Domestic conference”WIMP direction sensitive” (レビュー)Public discourse
- 神戸大学梅田 インテリジェントラボラトリ, Jan. 2017, Japanese, 神戸大学, 大阪, Domestic conferenceNEWAGE/CYGNUS”,ダークマターの懇談会Public discourse
- 明石市立天文科学館 プラネタリウム制作協力, Nov. 2016, Japanese, 明石市立天文科学館, 兵庫県, Domestic conferenceプラネタリウム「暗黒物質の謎をさぐる」制作協力Others
- 神戸大学理学部模擬授業, Oct. 2016, Japanese, 兵庫県立星陵高等学校, 兵庫県, Domestic conference「素粒子と宇宙」Public discourse
- 日本物理学会2019年秋季大会, Sep. 2016, Japanese, 宮崎大学, 宮崎大学, Domestic conferenceNEWAGE実験41:現状と将来Oral presentation
- 日本物理学会2016年秋季大会, Sep. 2016, Japanese, 宮崎大学, 宮崎大学, Domestic conferenceNEWAGE実験41:現状と将来Oral presentation
- 8th Hyogo Science E-cafe @ Sannnomiya NESCAFE, Jun. 2016, English, Sannnomiya NESCAFE, 兵庫県, Domestic conferenceDark Matter in the UniversePublic discourse
- 日本物理学会第71回年次大会, Mar. 2016, Japanese, 東北学院大学, 仙台, Domestic conferenceNEWAGE実験37:地下実験報告Oral presentation
- JGFoSフォローアップ研究会, Feb. 2016, Japanese, 埼玉大学東京ステーションカレッジ, Domestic conference暗黒物質Oral presentation
- Kick Off Symposium for Honolulu Office of Kobe University, 2016, English, KobeUniversity, 米国, International conferenceXMASS/NEWAGE Dark Matter SearchOral presentation
- 38th International Conference on High Energy Physics, 2016, English, Chicago, アメリカ合衆国, International conferenceNEWAGEOral presentation
- IDM 2016, 2016, English, Sheffield, 英国, International conferenceNEWAGE[Invited]Invited oral presentation
- Revealing the history of the universe with underground particle and nuclear research 2016, 2016, English, 東京大学, 東京大学, International conferenceNEWAGE[Invited]Invited oral presentation
- International Symposium on Radiation Detectors and Their Uses (ISRD2016), Jan. 2016, English, 高エネルギー加速器研究機構, 日本, Domestic conferenceRadiation Detector Development for Direct Dark Matter SearchOral presentation
- 平成27年度東京大学宇宙線研究所共同利用研究成果発表会, Dec. 2015, Japanese, 東京大学柏キャンパス, Domestic conferenceガス飛跡検出器による暗黒物質探索実験Oral presentation
- CRCタウンミーティング, Dec. 2015, Japanese, 東京大学柏キャンパス, Domestic conferenceNEWAGEOral presentation
- 日本物理学会 四国支部 チュートリアル講演会, Aug. 2015, Japanese, 徳島大学, Domestic conference宇宙の未知粒子『暗黒物質』を探るPublic discourse
- 島根大学 ヒッグス・初期宇宙プロジェクトセンター 一般講演会, Aug. 2015, Japanese, 島根大学, Domestic conference宇宙の未知粒子『暗黒物質』を探るPublic discourse
- Mini workshop on direct search of Dark Matter, Jul. 2015, English, デジョンCUPIBS, 韓国, International conferenceNEWAGEOral presentation
- CYGNUS 2015 : 5th Workshop on directional detection of Dark Matter, Jun. 2015, English, ロサンゼルス オクシデンタルカレッジ, 米国, International conferenceNEWAGE[Invited]Invited oral presentation
- 「極低放射能技術」研究会, Mar. 2015, Japanese, 兵庫県立 淡路夢舞台国際会議場, Domestic conference方向感度検出器の課題Oral presentation
- 「極低放射能技術」研究会, Mar. 2015, Japanese, 兵庫県立 淡路夢舞台国際会議場, Domestic conferenceNEWAGEにおけるラドンバックグラウンドOral presentation
- 武庫川女子大学生活美学研究所 平成26年度第4回定例研究会, Jan. 2015, Japanese, 武庫川女子大学・学術研究交流館, Domestic conferenceきらめく存在の不思議 ~美術と物理学と心理学の立場からPublic discourse
- 第11回マイクロパターンガス検出器研究会, Dec. 2014, Japanese, 東北大学, Domestic conferenceμ-PICの宇宙飛行士被曝モニターへの応用(PS-TEPC)Oral presentation
- 平成26年度宇宙線研究所共同利用研究成果発表研究会, Dec. 2014, Japanese, 東京大学宇宙線研究所(東京大学柏キャンパス), Domestic conferenceガス飛跡検出器による暗黒物質探索実験Oral presentation
- "NEWAGE", 7th international symposium, Dec. 2014, English, Paris(フランス), International conferencelarge TPCs for low-energy rare event detectionOral presentation
- 甲南大学セミナー, Nov. 2014, Japanese, 甲南大学, Domestic conference一時間でわかる暗黒物質Public discourse
- 11th Japanese-German Frontiers of Science Symposium(JGFoS), Oct. 2014, English, Bremen(ドイツ), International conferenceDark MatterPoster presentation
- 「地下素核研究」第一回研究会, Aug. 2014, Japanese, 大阪大学 豊中キャンパスシグマホール, Domestic conference低バックグラウンド技術を応用した方向感度を持つ暗黒物質探索の基礎研究Oral presentation
- 基研研究会 素粒子物理学の進展2014, Jul. 2014, Japanese, 京都大学 基礎物理学研究所, Domestic conference暗黒物質直接探索[Invited]Invited oral presentation
- 平成25年度東京大学宇宙線研究所共同利用研究成果発表会, Dec. 2013, Japanese, 東京大学柏キャンパス, Domestic conferenceガス飛跡検出器による方向に感度を持つ暗黒物質探索Nominated symposium
- 日本物理学会分科会, Sep. 2013, Japanese, 高知大学, Domestic conference直接探索の将来計画[Invited]Invited oral presentation
- 日本物理学会分科会, Sep. 2013, Japanese, 高知大学, Domestic conferenceNEWAGE実験26:2012年観測結果Oral presentation
- 日本物理学会分科会, Sep. 2012, Japanese, 京都産業大, Domestic conferenceNEWAGE実験23: 2012年地下測定経過報告Oral presentation
- Identification of Dark Matter (IDM12), Jul. 2012, English, Chicago, USA, International conferenceNEWAGE[Invited]Invited oral presentation
- 高エネルギー春の学校, May 2012, Japanese, 滋賀, Domestic conference地下実験[Invited]Invited oral presentation
- 第9回MPGD研究会, 2012, Japanese, Domestic conferenceビルドアップ法によるMPGDの製作Oral presentation
- Neutrinos and Dark Matter in Nuclear Physics(NDM12), 2012, English, International conferenceNEWAGEOral presentation
■ Research Themes
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Transformative Research Areas (A), Toho University, 01 Apr. 2024 - 31 Mar. 2029Direction Sensitive Dark Matter Search with High Precision Tracking Detector
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Pioneering), Kobe University, 28 Jun. 2024 - 31 Mar. 2027Development of a dark matter detector in a liquid state containing fluorine
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Nagoya University, 01 Apr. 2024 - 31 Mar. 2027Development of New Liquid Xenon Detectors with Thin Film Electrodes
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Pioneering), Kyoto University, 09 Jul. 2021 - 31 Mar. 2025Hunting solar axions with new pixel-type silicon detector under extremely low background environmentアクシオンは、素粒子標準理論の量子色力学の「強いCP問題」(=強い相互作用において、電荷パリティの反転で対称性の破れが検出されていないこと)の解決策として提唱された未発見の素粒子である。またアクシオンは、銀河の回転速度や宇宙マイクロ波背景放射の観測から存在が確実視されている暗黒物質として十分な量が宇宙初期に生成された可能性も考えられており、アクシオンの発見は素粒子物理学のみならず、宇宙物理学や天文学においても今後の学問の方向性を大きく転換・変革するブレイクスルーとなると考えられている。本研究では、XENON1T 実験から示唆された相互作用の一つであるアクシオンと原子核の相互作用に特化して検証するため、新型ピクセル型シリコン検出器と鉄同位体(原子番号57)を使った極低バックグラウンド環境での太陽アクシオン探査を実施する。 本年度は、主に実験場所の整備とそれぞれの検出器の準備を開始した。まずは、極低バックグラウンドを実現するための恒温槽と、その内部に放射線遮蔽用の鉛を置くための吊り下げ装置を設置した。また、鉛内部に設置するためのリジッドフレキシブル基板による新型ピクセル型X線検出器の実装と動作試験を開始し、この撮像素子と鉄同位体を設置するための無酸素銅による中心部を設計した。次に、その周りを囲む三角シンチレーターを使った飛跡検出型のアクティブシールドの製作を始め、ミューオン通過時の光量を測定した。さらに、環境モニター用の装置の製作を進めており、遠隔操作による定常観測実現へ向けた準備を進めた。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Kobe University, 05 Apr. 2021 - 31 Mar. 2025Migdal effect observation with position-sensitive gaseous detectors暗黒物質の直接探索実験は、2相式液体キセノンを用いた大質量検出器が数10GeV以上の質 量で制限を更新してきた。さらに2019年には、「ミダル効果」を用いることで、1GeV程度の低質量暗黒物質まで探索感度を伸ばした。ここで、ミグダル効果は理論的に計算されているが、実験的には未観測の現象である。つまり、今後キセノン検出器で低質量暗黒物質の探索、場合によっては発見の主張を行うためには、ミグダル効果の実証が必要不可欠となる。我々は独自の技術に基づく位置有感ガス検出器「マイクロTPC」を用いることで、ミグダル効果に特徴的な空間的情報を検出可能であることを考案 、中性子照射実験によってミグダル効果の観測について具体的なバックグラウンドを考慮した計算を行った。本提案では、この計算に基づいて、ミグダル効果の初観測を目指す。 ミグダル効果を観測するために、30cm角の位置有感ガス検出器「マイクロTPC」が必要である。2021年度には、30cm角実機の製作準備として30cm角のGEM及びTPCケージ、容器を製作した。また、これらを読み出すためのICの製作、対応する基板を製作した。産業技術総合研究所の中性子ビームを用いた試験を行い、主にビーム環境でのバックグラウンドをを測定した。このバックグラウンド(BG)測定の結果を活かして、2022年度にシールドの設計・試作を行い、マイクロTPCを用いた測定を開始する。 また、分担者の中村を中心として、キセノンガス中でのミグダル効果の観測に向けた基礎試験を進めた。XENONnT実験では、分担者の風間を中心として、XENON実験での暗黒物質探索を行った。分担者の伊部はミグダル効果を含んだ各種暗黒物質理論を進めた。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Tohoku University, 28 Jun. 2019 - 31 Mar. 2024Unraveling the history of the universe and matter evolution with underground physics総括班としての研究実績であり、直接的な研究活動は行わない。令和三年度は以下の活動を実施した。 1.研究代表者および地下大型実験の代表者が参加する運営会議を12回開催し、運転情報共有や個々の研究へのアドバイス、研究会の企画、協働体制の推進など領域の円滑な運営に努めた。また、内4回は、運営会議メンバーに加えて学術調査官や領域内外の評価者も参加する総括班会議を兼ね、研究の進捗や領域運営についての評価やアドバイスをもらい、運営に反映させた。また、領域の中間評価は、領域活動がそれぞれ評価され、留意事項・参考意見無くA判定であった。 2.領域研究会を2021年5月19日-21日に開催したほか、低温技術研究会6/18、素粒子宇宙論国際シンポジウム8/2-6, 暗黒物質国際シンポジウム11/29-12/2、若手研究会11/25-26、超新星ニュートリノ研究会1/6-7などを開催した。また、低温技術と量子デバイスが連携した新たなセミナーシリーズや、天文専攻とニュートリノ科学研究センターの合同談話会、地球科学と地球ニュートリノとのセミナーシリーズを開始するなど異分野との連携を幅広く開拓した。 3.成果発表、分野関連系、成果の波及のための旅費支援、国際活動のための旅費支援などを行なった。特に、COVID-19で海外渡航が困難である中、海外拠点へは長期派遣することで効率化を図った。また、国内設置の大型プロジェクトでは自動監視の仕組みを進めることで、昼間は日本人が現地で運転し、夜間は海外からリモート監視で運転することで、効率的な運転をおこなった。さらに、比較的小規模な装置を使用するプロジェクトでは、海外の施設を国内にコピーして構築し、遠隔地からアドバイスを得ることで、海外渡航をしなくてもそれぞれの個性を活かして役割分担をしながら研究を推進できるように工夫した。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Kobe University, 28 Jun. 2019 - 31 Mar. 2024Direction-sensitive dark matter searchNEWAGE実験はガス検出器(μ-PIC)を用いた方向に感度を持つ暗黒物質を行っている。このために、放射性不純物の含有量の少ないμ-PIC(低BGμ-PIC)の開発を代表者の身内が行う。2021年度には、2020年度に製作した30cm角低BGμ-PICの性能評価を詳細に行った。地下実験室では、既存のμ-PICを用い、低閾値化、低バックグラウンド化の改良を施した暗黒物質探索を行い、半年以上のデータを取得した。また、既存のμ-PICによる108日分の観測データを用いて、原子核反跳の三次元飛跡を利用した解析を行った結果の出版(PTEP 2021)、カーボンファイバーによるガス中からのラドン除去に関する論文出版なども行った(JINST2020)。 ガス検出器の深刻なBGである放射性同位体ラドン低減のために、分担者の小川が、吸着剤(モレキュラーシーブス, MS)を用いたラドン除去システムを開発している。2021年度には、英国シェフィールド大との共著論文を出版した(JINST2021)。また2020年度までに製作したものよりも低BGなMSの製作のため、材料の選択、製法の見直しを行った。また、ラドンBG・吸着の測定システムの運用を開始した。 NEWSdm 実験は、固体検出器(原子核乾板)を用いた方向に感度を持つ暗黒物質を行っている。このために読み取り装置の高感度化・高速化を分担者の中が行っている。2021年度には、東邦大学にプラズモン共鳴による事象解析に特化した読み取りシステムを構築した。また、イタリアの現地研究者と協力し、グランサッソ国立研究所での地下実験環境におけるバックグラウンドの理解を目的とした観測実験、ならびにsub-MeV帯の中性子の測定を目的とした観測実験を実施した。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory), Kobe University, 09 Jul. 2021 - 31 Mar. 2023Development of a Dark Matter Detector with Fluorine暗黒物質直接探索は、液体キセノンを用いた実験が感度を飛躍的に向上させている。一方、スピンに依存した反応に注目するとキセノンよりもフッ素が有利に働 き、PICOと呼ばれるフッ素を含むバブルチェンバー(エネルギー情報を取得できない閾値型検出器)を用いた実験も感度をのばしている。知名度としては液体キ セノンを用いた実験が上だが、数年以内にPICO実験によって暗黒物質発見の示唆がなされる可能性もある。こうした場合には、フッ素を含み、大質量が可能かつエネルギー情報を 取得可能な実験による検証が必要であるが、現在こうした検出器の開発は世界的に行われていない。本提案は、気体として発光及び電離電子の検出が実証されて いるCF4ガスを液化し、大質量検出器として用いるための基礎研究を行い、暗黒物質検出器としてのデモンストレーションを行う。キセノンの例では液化による発光量の変化はないなど、液化CF4が検出器として動作する可能性は十分ある一方で、検出器としての性能評価が行われていない、萌芽的な研究である。 本研究では、フッ素を含む大質量検出器の有力な材料として液化CF4(沸点145K)に着目、その性質を研究する。液体希ガス検出器としてキセノン(沸点165K)が用いられているが、CF4に関しては検出器としての性能はこれまで調べられていない。本研究では、過去に報告のない液化CF4の発光量を測定することを第一の目的とする。令和3年度には、光電子増倍管を2ケ用いた実験装置に気体のCF4を導入し、60keVのガンマ線を用いて光量を観測した結果を定量的に解析し、低温で光量が増加することを確認、論文として発表した。また、この結果を踏まえて、CF4を液化するための次期測定装置を設計、製作した。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), The University of Tokyo, 01 Apr. 2019 - 31 Mar. 2023Enhancing the direct search for dark matter in the XENON nT experiment with a water Cerenkov neutron detectorDespite COVID-19 related restrictions great progress was made towards starting the XENONnT experiment at LNGS in Italy. The liquid xenon time projection chamber was filled with liquid xenon, and its water Cherenkov muon detector shield and the neutron veto were filled with pure water. Commissioning of the full XENONnT detector started in this configuration at the end of FY2020. In January and February PI Kai Martens worked onsite at LNGS with our European colleagues to commission the neutron veto: All photomultiplier tube signals and FADC channels were checked and debugged with the help of the neutron veto's LED calibration system. After this pulser driven LED calibration system itself was brought into operation and tuned, a preliminary nVeto calibration with 2.6 MeV gamma rays from 208Tl was performed with a 232Th source; the results align with our expectations and projections for the neutron veto efficiency. The main purpose of PI Kai Martens's trip were onsite preparations for the installation of the Kamioka technology based gadolinium water purification system in the summer of 2021; these onsite preparations were successfully concluded and we expect the installation to proceed without delay this summer. Our Japanese group also got involved with the analysis of XENON1T data, and two of our senior members were elected to serve on the XENON collaboration's editorial board; please see the list of publications with neutron veto member authorship later in this report.
- 学術研究助成基金助成金/挑戦的研究(萌芽), Jun. 2018 - Mar. 2020, Principal investigatorCompetitive research funding
- 科学研究費補助金/基盤研究(A), Apr. 2016 - Mar. 2020, Principal investigatorCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Tohoku University, 06 Nov. 2015 - 31 Mar. 2019Networking international underground laboratories for revealing the history of the universeInternational collaboration among world underground laboratories has been developed aiming at the large synergies of sharing the common technologies. Concerning the search for dark matter in which international unification is occurring, Japanese team decided to join the foreign project bringing the technologies developed in this innovative area. Concerning the directional measurement of dark matter, Kamioka underground laboratory serves as a world-wide hub of its developmental efforts. As for the future innovative technology of scintillating bolometers, scintillation crystal technology in our area and bolometer technology in Korea can be combined and cooperative development has been started. These cooperative work on the basis of common technologies will secure the continuous leadership in the field of underground particle and nuclear research.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Tohoku University, 10 Jul. 2014 - 31 Mar. 2019Revealing the history of the universe with underground particle and nuclear researchIn this activity, the experimental projects located at Kamioka underground have cooperated on the common basis of ultra-low radioactivity techniques and science among them has been bridged by particle cosmology theories aiming at revealing the history of the universe. We have successfully promoted varieties of close collaborations through the frequent operational/executive meetings. At the same time, the newly defined our science area, originally spread in diverse fields, has organized common technologies and interests. Consequently, mobility and career path of young researchers have been increased. We have held many domestic/international conferences with new events such as tutorial and panel discussion and we developed many collaborations and interdisciplinary researches within/beyond our innovative area.
- 科学研究費補助金/新学術領域研究, Apr. 2014 - Mar. 2019, Principal investigatorCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Osaka University, 01 Apr. 2014 - 31 Mar. 2018Development of scintillating bolometer for next generation neutrino-less double beta decay searchIn this research, we developed a high energy resolution detector which is very important for neutrino-less double beta decay search. The scintillating bolometer with undoped calcium fluoride scintillation crystal containing 48Ca isotope, which has the highest Q value among double beta decay isotopes, was used. The crystal was cooled down to an extremely low temperature of 10 mK. We developed a method to simultaneously detect scintillation light in addition to heat quantity. Compare the signal intensities of both light and heat, types of particles can be identified. It was succeeded for the first time to realize the scintillating bolometer detector using the undoped calcium fluoride crystals during the research period. This achievement is an important step toward future high-sensitivity, large-scale neutrino-less double beta decay study using 48Ca isotope.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Niihama National College of Technology, 01 Apr. 2014 - 31 Mar. 2018Theoretical study of direct dark matter detection with directionalityIn directional detection of dark matter, not only recoil energy but also dark matter direction are expected to be detected. Some N-body simulation of dark matter suggest that the dark matter velocity distribution has anisotropic component. Directional detector is suitable to verify the anisotropy. By investigating data of Monte-Carlo simulation of dark matter scattering, we find that about O(10000) event number is required to check the anisotropy for both gas and solid directional detector.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, Kobe University, 01 Apr. 2014 - 31 Mar. 2017Development of fine MPGDs using carbon sputteringThe new MPGD with resistive electrodes using sputtered carbon (DLC) has been developed. Spark reduction in short gaps between anode and cathode was realized by resistive electrodes. The prototype of MSGC-type MPGD has been developed for estimating the limitation of fine structure of DLC electrodes on PCB technology. After that, prototype of Micro-Pixel chamber with resistive cathode with DLC has been developed and tested. Besides, using multi-layer PCB technology, HV bias resisters and readout AC coupling capacitors are included inside readout PCB compactly. Then very compact readout from u-PIC type detector has been realized. The operation test shows good performances with fine position resolution.
- 学術研究助成基金助成金/挑戦的萌芽研究, Apr. 2015 - Mar. 2017, Principal investigatorCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), High Energy Accelerator Research Organization, 01 Apr. 2013 - 31 Mar. 2016Development of wide gap semiconductor pixel detector for light dark matter searchWe developed pixel detectors based on wide gap semiconductor materials(i.e. diamond and silicon carbide) for light dark matter search. The wide gap semiconductor containing carbon improves the sensitivity for light dark matter search. The electrode size of the detectors is about 100um x 100um. The detector shows two or three orders of magnitudes leakage reduction compared to a silicon pixel detector, and the detector capacitance of the diamond pixel is one half the silicon pixel detector. We confirmed developed pixel detectors have enough S/N for our purpose. In order to evaluate the detectors low noise front-end integrated circuit is developed.The equivalent noise charge(ENC) is less than 100 electron which satisfies S/N for our evaluation of the detectors.
- 科学研究費補助金/新学術領域研究, Apr. 2014 - Mar. 2016, Principal investigatorCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2012 - 31 Mar. 2015Development of a high-sensitivity radon detector for purified gases and application to a dark matter experimentWe have developed a high-sensitivity radon detector (80L detector) to assay reaming radon in purified rare gases. We have lowered background level of the 80L detector. The achieved background level of the 80L detector is 0.81±0.08 (count/day). This level is about 1/3 of that of the previous radon detector. The basic performances are obtained in Ar gas and in Xe gas. This will enable us to apply the 80L detector to a dark matter search experiment with rare gas and so on. In a dark matter search experiment, XMASS, a real-time measurement device to assay radon in purified water is newly developed in this research, then started its operation.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), The University of Tokyo, 01 Apr. 2012 - 31 Mar. 2015A Search for Dark MatterWe know that there exists unknown matter in the universe called dark matter that amounts 5 to 6 times more than the ordinary matter. However, we do not know what they are. There are varieties of candidates for dark matter. Some interact with the ordinary matter and kick out the nucleus and some emit gamma rays when they hit the target material of the detector. Our detector, using 835 kg of liquid xenon as a target material has a characteristics of having very low energy threshold and the ability to detect e/gamma events as well as nuclear recoils. Therefore we are able to make high sensitive searches for low mass dark matter and a new type of dark matter that emits gamma rays. After the observation lasted more than one year, we could not find dark matter, but set very stringent limits for those candidates. We have also demonstrated that we are able to make the detector bigger and be able to achieve much higher sensitive searches in future.
- 学術研究助成基金助成金/挑戦的萌芽研究, Apr. 2013 - Mar. 2015, Principal investigatorCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Saga University, 2009 - 2011R & D on High precision 3D particle detector for future experimentsMicro pattern gas detector has became more popular than wire chamber in the charged particle detection. This movement request us to improve corresponding readout system which allow more precise detection. We develop a new pixel readout CMOS chip which consists of 20x20 pixels including ADC, TDC and TOT digital processing in each 200μm x 200μm pixel. Heavy ion irradiation with MPGD amplification provides clean track signal and good spatial resolution better than 100microns.
- 科学研究費補助金/若手研究(A), 2011, Principal investigatorCompetitive research funding
- 学術研究助成基金助成金/挑戦的萌芽研究, 2011, Principal investigatorCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (A), Kyoto University, 2007 - 2009Direction-Sensitive Dark Matter Search in a Deep Underground Laboratory with a Low Background Tracking DetectorWe performed a direction-sensitive dark matter search experiment with a three-dimensional gaseous tracking device "micro-TPC". We installed our detector in a underground laboratory and performed a dark matter search experiment. We obtained a limit five times better than the one we got in a surface laboratory (published as Physics Letters B 686(2010)11). Then we upgraded the detector to improve the sensitivity by one order of magnitude.
- 日本学術振興会, 科学研究費助成事業, 萌芽研究, 東京大学, 2006 - 2007位置感度型ガス増幅装置を用いた光検出器の開発今年度は、昨年度に引き続きフッ化マグネシウム窓にCsI光電面を蒸着した透過型光電面を用いた光検出器の性能評価を行った。ガス増幅部に関しては、昨年度の経験からガスの劣化を招かず、フレームに取り付けやすくするため、あらかじめ穴の開いたGEMを開発し導入した。増幅率は200000倍を達成し、昨年度よりさらに10倍にすることができた。これにより原理的に一光電子を検出可能な光検出器が実現した。長期安定性に関しては、エキシマランプを用い、真空紫外光を光電面に照射し、プラズマ放電の周波数と一致した出力を記録することで、一年間光電面が劣化することなく、光検出器として動作することを確認した。そして、光検出器としての評価を行うための真空紫外光光源としてNdをドープしたフッ化ランタン(Nd:LaF3)結晶シンチレーターに着目し、まず光源としての性能を評価した。この結晶は光量は少ないものの、中心発光波長173nmのシンチレーション光を出すことが分かっていた。既存の真空紫外光に感度がある光電子増倍管を用い、Nd:LaF3にアメリシウム241からの5.5MeVのα線を照射した際の光量を求めたところ、1MeV(ガンマ線相当)あたり100光子の発光をであり、光検出器評価用としては最適な微弱真空紫外光源となることを確認した。そして、実際にこの光源を開発した光検出器にとりつけ、シンチレーション光を測定した。3光電子程度のピークを検出することに成功し、実際に一光電子をとらえる能力のあることを示した。透過型CsI光電面の量子効率が2%であることも確認し、当初の設計通りの光検出器として完成した。今後の研究は反射型光電面導入による量子効率の向上を中心にすすめていく方針である。また、より発光量の多い結晶と組み合わせたX線イメージング検出器としての応用の可能性があり、東北大、京都大のグループと共同研究を行っていくこととなった。
- 日本学術振興会, 科学研究費助成事業, 特定領域研究, 京都大学, 2006 - 2007マイクロTPCを用いた超対称性暗黒物質直接検出の為の地上・地下実験による基礎研究平成19年度の研究では、(1)京大タンデムを用いたマイクロTPC性能評価実験のための基礎実験(2)神岡地下実験室でのマイクロTPCの長期安定動作およびバックグラウンド測定を行った。 (1)電気分解法によって製作したTiDターゲットを京大タンデムにて重陽子ビームに照射、ターゲット中の重水素(D)と反応して、中性子とヘリウム3原子核を生成、ヘリウム3原子核をシリコン検出器で検出、中性子をマイクロTPCに照射することを目的としている。重陽子ビームの加速電圧、ターゲットの作成方法を変更しながら合計9度のビーム試験を行い、真空槽外部に設置した中性子検出器との同時計測によって真空槽内部に設置したシリコン検出器でエネルギースペクトルを取得した。この結果、平成18年度に設置した重陽子ビームの減速材(75マイクロメートル厚のアルミニウム)が背景事象の源となることが判明した。減速材を取り除いて2.5メガ電子ボルトに加速した重陽子ビームをターゲットに直射することで、シリコン検出器と中性子検出器の同時計測率が上昇、エネルギーの定まった中性子を用いたマイクロTPC較正への基礎となった。 (2)30cm角マイクロTPCを用いて、神岡地下実験室での長期測定及びバックグラウンド測定をを行った。平成19年1月に神岡地下実験室に装置を設置、月に1,2度のメンテナンスを除いて無人運転を行い、安定したデータ取得を実現した。更に宇宙からの放射線バックグラウンドが低い条件下での観測をおこなったことで、検出器内部のバックグラウンドを調査、得られたエネルギースペクトル、時間変化とシミュレーション結果を合わせることで、検出器構成物質の放射性不純物が現在のバックグラウンドの主であることが判明した。
- 日本学術振興会, 科学研究費助成事業, 若手研究(A), 京都大学, 2004 - 2006暗黒物質探索実験のための大容積微細三次元飛跡検出器(大型マイクロTPC)の開発平成18年度の研究では、平成17年度までに製作した30cm角マイクロTPCの(1)基礎評価(2)暗黒物質検出器としての詳しい性能評価、(3)地上実験室での暗黒物質探索実験、(4)地下実験の開始、を行った。 (1)平成17年度までに製作した30cm角マイクロTPCに標準的なアルゴン+エタンの混合ガスを封入、エネルギー分解能、位置分解能などの性能評価を行い、結果を平成18年7月にイタリア・ピサで行われた第八回放射線検出器国際会議(IWORID8)にて口頭発表した。 (2)標準的なガスでの基礎評価を終えた30cm角マイクロTPCに、暗黒物質探索実験で使用するCF_4ガスを0.2気圧で封入、暗黒物質探索のための詳しい性能評価を行った。具体的には、上記測定に加えて長期安定性、絶対検出効率の測定、検出効率の飛跡方向依存性、ガンマ線事象の排除カ、を測定した。この結果、暗黒物質探索実験に十分な性能を有する検出器であることが示され、結果を第六回暗黒物質検出国際会議(IDM2006)にて口頭発表した。この会議では同様な手法を用いて研究を進めている英国グループの発表もあった。本科研費の開始した平成16年の同会議(IDM2004)では英国グループにリードされていたが2年間の研究で英国グループの有する検出器の性能を上回る検出器を完成させたことが判明した。 (3)完成した30cm角マイクロTPCを用いて、地上実験室での暗黒物質探索実験を行った。地上であるために中性子バックグラウンドによって暗黒物質への感度が制限されているが、方向に感度を持つ手法としてはじめて暗黒物質と通常の物質との反応率に対して制限をつけた。この結果を論文としてまとめ、Physics Letters B誌に投稿した。 (4)30cmマイクロTPCを平成19年1月に東京大学宇宙線研究所神岡宇宙粒子地下実験室に設置、宇宙からの放射線バックグラウンドが低い条件下での観測を開始した。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Keio University, 2004 - 2006Development of high sensitivity, light-weight portable gamma camera based on innovative fundamentals for nuclear medicine examinationsThe Compton Camera which can directly detect the incident direction of gamma-ray does not need the collimator in principle. This camera is very efficient and high sensitive because it can utilize the information of gamma-ray from various directions. We applied Compton effects for nuclear medicine field and developed a new-type gamma camera which omits the shielding around the collimator and detector. We have realized both full ray-tracing and the background rejection for MeV and sub-MeV gamma-ray imaging by detecting the direction of the scatted electron in Compton process. The Compton camera is consisted of two detectors. Incident gamma-ray is scattered in the first (scatter) detector by Compton scattering. This detector takes the recoil electron energy. Our system utilizes a gas chamber as the first detector and the track of the recoil electron was detected with a flat detector placed on the edge of the gas chamber. The scattered gamma-ray is stopped in the second (absorb) detector. The second detector takes the energy and position of scattered gamma-ray. Using above energy and position information, the Compton gamma-ray camera is able to reconstruct the incident gamma-ray direction as cylindrical direction. What is important is that this system does not need the collimator. It enables the wide energy dynamic range and wide FOV.
- 日本学術振興会, 科学研究費助成事業, 特定領域研究, 京都大学, 2002 - 2006広視野ガンマ線カメラによるブラックホールからの熱的ガンマ線放射の探索我々は18年度に10cm角電子飛跡検出型コンプトンカメラを搭載した気球実験を行い、宇宙拡散ガンマ線および大気2次ガンマ線のサブMeV領域での検出実験を行い、良質のデータを取ることに成功した。18年度に荒いデータ解析は終了したが、実験精度、特に宇宙線による大気からのガンマ線雑音、大気による吸収などを正確にシミュレーションするため、シミュレーションの改良を中心に行った。特に精度向上のため気球搭載装置を実験室で再度動作させ、装置のレスポンスをシミュレーションで精度良く再現できる要調整作業を行った。また大気構造なども精度よくシミュレーションに取り入れることで、今回世界で初めて数十keVから十MeV付近までの広いエネルギー範囲での大気ガンマ線シミュレーションに成功、今までの計算、シミュレーションなどともスペクトル、および天頂角分布に対して良い一致が得られた。このように信頼性のあるシミュレーションを完成させた。またこのシミュレーションによりデータ解析も改良され検出ガンマ線を約2倍に増やすことが出来た。またこのシミュレーションにより検出器細部の動作を再現することが可能となり、今後の改善点が明確になるようになった。今、これらの成果をまとめている。また地上での30x30x30cmのTPCおよびGSOピクセルカメラを組み合わせた大型カメラの製作も終了し、300keV-900keVの範囲でガンマ線再構成に成功した。
- 2002 - 2005暗黒物質探索実験のためのMPGC-TPCの開発Competitive research funding