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AOKI ShigekiGraduate School of Human Development and Environment / Department of Human Environmental ScienceProfessor
Research activity information
■ Award- Mar. 2016 日本物理学会, 第21回論文賞, Observation of tau neutrino appearance in the CNGS beam with the OPERA experiment.（Prog. Theor. Exp. Phys. Vol.2014, No.10）
- Nov. 2015 Fundamental Physics Prize Foundation, 2016 Breakthrough Prize in Fundamental Physics, Super-Kamiokande, SNO, KamLAND, K2K/T2K, and Daya Bay experimentsFor the fundamental discovery and exploration of neutrino oscillations, revealing a new frontier beyond, and possibly far beyond, the Standard Model of particle physics.International academic award
- Mar. 2002 日本物理学会, 第7回論文賞, Direct Observation of Sequential Weak Decay of a Double Hypernucleus（Prog. Theor. Phys. Vol.85, No.6 1287）
- Mar. 2025, The European Physical Journal CScientific journal
- The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7(16.3)×1020 protons on target in (anti)neutrino mode, the analysis finds a 1.9σ exclusion of CP conservation (defined as JCP=0) and a 1.2σ exclusion of the inverted mass ordering. Published by the American Physical Society 2025American Physical Society (APS), Jan. 2025, Physical Review Letters, 134(1) (1)Scientific journal
- Elsevier BV, Oct. 2024, Astroparticle Physics, 103055 - 103055Scientific journal
- Abstract The SHiP-charm project was proposed to measure the associated charm production induced by 400 GeV/c protons in a thick target, including the contribution from cascade production. An optimisation run was performed in July 2018 at CERN SPS using a hybrid setup. The high resolution of nuclear emulsions acting as vertex detector was complemented by electronic detectors for kinematic measurements and muon identification. Here we present first results on the analysis of nuclear emulsions exposed in the 2018 run, which prove the capability of reconstructing proton interaction vertices in a harsh environment, where the signal is largely dominated by secondary particles produced in hadronic and electromagnetic showers within the lead target.Springer Science and Business Media LLC, Jun. 2024, The European Physical Journal C, 84(6) (6)Scientific journal
- Abstract We are developing the Gamma-Ray Astro-Imager with Nuclear Emulsion project, designed for 10 MeV–100 GeV cosmic γ-ray observations with a high angular resolution (5′/0.°08 at 1–2 GeV) and a polarization-sensitive large-aperture (∼10 m2) emulsion telescope for repeated long-duration balloon flights. In 2018, a balloon-borne experiment was carried out in Australia with a 0.38 m2 sensitive area and a flight duration of 17.4 hr, including 6.7 hr of Vela observations. Significant improvements compared with the 2015 balloon-borne experiment were achieved by a factor of 5, including both an increase in effective area × time and a reduction in the background contribution. We aimed to demonstrate the telescope’s overall performance based on detection and imaging of a known γ-ray source, the Vela pulsar. A robust detection of the Vela pulsar was achieved with a 68% containment radius of 0.°42, at a significance of 6σ, at energies above 80 MeV. The resulting angular profile is consistent with that of a pointlike source. We achieved the current best imaging performance of the Vela pulsar using an emulsion γ-ray telescope with the highest angular resolution of any γ-ray telescope to date.American Astronomical Society, Dec. 2023, The Astrophysical Journal, 960(1) (1), 47 - 47Scientific journal
- Dec. 2023, Physical Review D, 108(11) (11)Scientific journal
- Nov. 2023, Physical Review D, 108(9) (9)Scientific journal
- American Physical Society (APS), Oct. 2023, Physical Review D, 108(7) (7)Scientific journal
- Abstract Tau neutrino is the least studied lepton of the Standard Model (SM). The NA65/DsTau experiment targets to investigate Ds, the parent particle of the ντ, using the nuclear emulsion-based detector and to decrease the systematic uncertainty of ντ flux prediction from over 50 % to 10 % for future beam dump experiments. In the experiment, the emulsion detectors are exposed to the CERN SPS 400 GeV proton beam. To provide optimal conditions for the reconstruction of interactions, the protons are required to be uniformly distributed over the detector's surface with an average density of 105 cm-2 and the fluctuation of less than 10%. To address this issue, we developed a new proton irradiation system called the target mover. The new target mover provided irradiation with a proton density of 1.01 × 105 cm-2 and the density fluctuation of 1.9 ± 0.3% in the DsTau 2021 run.IOP Publishing, Oct. 2023, Journal of Instrumentation, 18(10) (10), P10008 - P10008Scientific journal
- Abstract The T2K experiment presents new measurements of neutrino oscillation parameters using $$19.7(16.3)\times 10^{20}$$ protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional $$4.7\times 10^{20}$$ POT neutrino data was collected at the FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data. Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations. Frequentist and Bayesian analyses are presented, including results on $$\sin ^2\theta _{13}$$ and the impact of priors on the $$\delta _{\textrm{CP } }$$ measurement. Both analyses prefer the normal mass ordering and upper octant of $$\sin ^2\theta _{23}$$ with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on $$\sin ^2\theta _{13}$$ from reactors, $$\sin ^2\theta _{23}=0.561^{+0.021}_{-0.032}$$ using Feldman–Cousins corrected intervals, and $$\varDelta {}m^2_{32}=2.494_{-0.058}^{+0.041}\times 10^{-3}~\text {eV}^2$$ using constant $$\varDelta \chi ^{2}$$ intervals. The CP-violating phase is constrained to $$\delta _{\textrm{CP } }=-1.97_{-0.70}^{+0.97}$$ using Feldman–Cousins corrected intervals, and $$\delta _{\textrm{CP } }=0,\pi $$ is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than $$2\sigma $$ credible level using a flat prior in $$\delta _{\textrm{CP } },$$ and just below $$2\sigma $$ using a flat prior in $$\sin \delta _{\textrm{CP } }.$$ When the external constraint on $$\sin ^2\theta _{13}$$ is removed, $$\sin ^2\theta _{13}=28.0^{+2.8}_{-6.5}\times 10^{-3},$$ in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.Springer Science and Business Media LLC, Sep. 2023, The European Physical Journal C, 83(9) (9)Scientific journal
- Abstract This paper describes a new νe identification method specifically designed to improve the low-energy (<30 GeV) νe identification efficiency attained by enlarging the emulsion film scanning volume with the next generation emulsion readout system. A relative increase of 25-70% in the νe low-energy region is expected, leading to improvements in the OPERA sensitivity to neutrino oscillations in the framework of the 3 + 1 model. The method is applied to a subset of data where the detection efficiency increase is expected to be more relevant, and one additional νe candidate is found. The analysis combined with the ντ appearance results improves the upper limit on sin 22θμe to 0.016 at 90% C.L. in the MiniBooNE allowed region $\Delta m^2_{41} \sim {0.3}eV^2$.Oxford University Press (OUP), Jan. 2023, Progress of Theoretical and Experimental Physics[Refereed]Scientific journal
- Abstract A multi-stage shifter allows timestamped measurements by emulsion films, which have a thin medium and high resolution (< 1μm). Using multiple layers of emulsion films that move at different speeds like hands of an analog clock, the shifter can create a unique positional displacement with respect to the time-track recorded. The time information of each track is obtained by reproducing each positional displacement by track reconstruction. We developed a new model of shifter with a lighter structure to enable a large aperture area and long-duration observation times by adding more layers. Operational testing suggested that the new shifter has a sub-second time resolution, which allows an emulsion gamma-ray telescope to obtain an imaging resolution within 1° (> 80 MeV), like previous balloon experiments. Furthermore, by adding a layer which move at 100 μm s-1, it achieved the 0.1 s time resolution required for high-resolution imaging above 1 GeV. We also found the possibilities of an almost three-fold improvement in the spatial resolutions in track reconstruction compared with the conventional model and of achieving time resolution on a scale of tens of milliseconds, which would enable phase resolution of a pulsar.Oxford University Press (OUP), Nov. 2022, Progress of Theoretical and Experimental Physics, 2022(11) (11)[Refereed]Scientific journal
- Abstract The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium for the measurement of charged particles produced in neutrino interactions at its near detector complex. Over 10 years of operation the measured light yield recorded by the scintillator based subsystems has been observed to degrade by 0.9–2.2% per year. Extrapolation of the degradation rate through to 2040 indicates the recorded light yield should remain above the lower threshold used by the current reconstruction algorithms for all subsystems. This will allow the near detectors to continue contributing to important physics measurements during the T2K-II and Hyper-Kamiokande eras. Additionally, work to disentangle the degradation of the plastic scintillator and wavelength shifting fibres shows that the reduction in light yield can be attributed to the ageing of the plastic scintillator. The long component of the attenuation length of the wavelength shifting fibres was observed to degrade by 1.3–5.4% per year, while the short component of the attenuation length did not show any conclusive degradation.IOP Publishing, Oct. 2022, Journal of Instrumentation, 17(10) (10), P10028 - P10028[Refereed]Scientific journal
- American Physical Society (APS), Aug. 2022, Physical Review D, 106(3) (3)[Refereed]Scientific journal
- May 2022, EUROPEAN PHYSICAL JOURNAL C, 82(5) (5), English, Co-authored internationally[Refereed]
- Mar. 2022, JOURNAL OF INSTRUMENTATION, 17(3) (3)
- Dec. 2021, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2021(12) (12), English[Refereed]Scientific journal
- Abstract The OPERA experiment was designed to discover the vτ appearance in a vμ beam, due to neutrino oscillations. The detector, located in the underground Gran Sasso Laboratory, consisted of a nuclear photographic emulsion/lead target with a mass of about 1.25 kt, complemented by electronic detectors. It was exposed from 2008 to 2012 to the CNGS beam: an almost pure vμ beam with a baseline of 730 km, collecting a total of 1.8·1020 protons on target. The OPERA Collaboration eventually assessed the discovery of vμ→vτ oscillations with a statistical significance of 6.1 σ by observing ten vτ CC interaction candidates. These events have been published on the Open Data Portal at CERN. This paper provides a detailed description of the vτ data sample to make it usable by the whole community.Springer Science and Business Media LLC, Aug. 2021, Scientific Data, 8(1) (1)Scientific journal
- American Physical Society (APS), Jun. 2021, Physical Review D, 103(11) (11)[Refereed]Scientific journal
- American Physical Society (APS), Jun. 2021, Physical Review D, 103(11) (11)[Refereed]Scientific journal
- Springer Science and Business Media LLC, Apr. 2021, Journal of High Energy Physics, 2021(4) (4)
A<sc>bstract</sc> Dark matter is a well-established theoretical addition to the Standard Model supported by many observations in modern astrophysics and cosmology. In this context, the existence of weakly interacting massive particles represents an appealing solution to the observed thermal relic in the Universe. Indeed, a large experimental campaign is ongoing for the detection of such particles in the sub-GeV mass range. Adopting the benchmark scenario for light dark matter particles produced in the decay of a dark photon, withα D = 0. 1 andm A ′ = 3m χ , we study the potential of the SHiP experiment to detect such elusive particles through its Scattering and Neutrino detector (SND). In its 5-years run, corresponding to 2· 1020 protons on target from the CERN SPS, we find that SHiP will improve the current limits in the mass range for the dark matter from about 1 MeV to 300 MeV. In particular, we show that SHiP will probe the thermal target for Majorana candidates in most of this mass window and even reach the Pseudo-Dirac thermal relic.[Refereed]Scientific journal - Oxford University Press (OUP), Mar. 2021, Progress of Theoretical and Experimental Physics, 2021(3) (3)
Abstract We have carried out $\nu_{\mu}$ charged-current interaction measurement on iron using an emulsion detector exposed to the T2K neutrino beam in the J-PARC neutrino facility. The data samples correspond to $4.0 \times 10^{19}$ protons on target, and the neutrino mean energy is 1.49 GeV. The emulsion detector is suitable for precision measurements of charged particles produced in neutrino–iron interactions with a low momentum threshold thanks to a thin-layered structure and sub-$\mu$m spatial resolution. The charged particles are successfully detected, and their multiplicities are measured using the emulsion detector. The cross section was measured to be $\sigma^{\mathrm{Fe } }_{\mathrm{CC } } = (1.28 \pm 0.11({\mathrm{stat. } })^{+0.12}_{-0.11}({\mathrm{syst. } })) \times 10^{-38} \, {\mathrm{cm } }^{2}/{\mathrm{nucleon } }$. The cross section in a limited kinematic phase space of induced muons, $\theta_{\mu} < 45^{\circ}$ and $p_{\mu} > 400 \, {\rm MeV}/c$, on iron was $\sigma^{\mathrm{Fe } }_{\mathrm{CC \hspace{1mm} phase \hspace{0.5mm} space } } = (0.84 \pm 0.07({\mathrm{stat. } })^{+0.07}_{-0.06}({\mathrm{syst. } })) \times 10^{-38} \, {\mathrm{cm } }^{2}/{\mathrm{nucleon } }$. The cross-section results are consistent with previous values obtained via different techniques using the same beamline, and they are reproduced well by current neutrino interaction models. These results demonstrate the capability of the detector in the detailed measurement of neutrino–nucleus interactions around the 1 GeV energy region.[Refereed]Scientific journal - Oxford University Press (OUP), Mar. 2021, Progress of Theoretical and Experimental Physics, 2021(4) (4)
Abstract We report measurements of the flux-integrated $\overline{\nu}_\mu$ and $\overline{\nu}_\mu+\nu_\mu$ charged-current cross-sections on water and hydrocarbon targets using the T2K anti-neutrino beam with a mean beam energy of 0.86 GeV. The signal is defined as the (anti-)neutrino charged-current interaction with one induced $\mu^\pm$ and no detected charged pion or proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton Module. The phase space of muons is restricted to the high-detection efficiency region, $p_{\mu}>400~{\rm MeV}/c$ and $\theta_{\mu}<30^{\circ}$, in the laboratory frame. An absence of pions and protons in the detectable phase spaces of $p_{\pi}>200~{\rm MeV}/c$, $\theta_{\pi}<70^{\circ}$ and $p_{\rm p}>600~{\rm MeV}/c$, $\theta_{\rm p}<70^{\circ}$ is required. In this paper, both the $\overline{\nu}_\mu$ cross-sections and $\overline{\nu}_\mu+\nu_\mu$ cross-sections on water and hydrocarbon targets and their ratios are provided by using the D’Agostini unfolding method. The results of the integrated $\overline{\nu}_\mu$ cross-section measurements over this phase space are $\sigma_{\rm H_{2}O}=(1.082\pm0.068(\rm stat.)^{+0.145}_{-0.128}(\rm syst.)) \times 10^{-39}\,{\rm cm^{2} / nucleon}$, $\sigma_{\rm CH}=(1.096\pm0.054(\rm stat.)^{+0.132}_{-0.117}(\rm syst.)) \times 10^{-39}\,{\rm cm^{2} / nucleon}$, and $\sigma_{\rm H_{2}O}/\sigma_{\rm CH} = 0.987\pm0.078(\rm stat.)^{+0.093}_{-0.090}(\rm syst.)$. The $\overline{\nu}_\mu+\nu_\mu$ cross-section is $\sigma_{\rm H_{2}O} = (1.155\pm0.064(\rm stat.)^{+0.148}_{-0.129}(\rm syst.)) \times 10^{-39}\,{\rm cm^{2} / nucleon}$, $\sigma_{\rm CH}=(1.159\pm0.049(\rm stat.)^{+0.129}_{-0.115}(\rm syst.)) \times 10^{-39}\,{\rm cm^{2} / nucleon}$, and $\sigma_{\rm H_{2}O}/\sigma_{\rm CH}=0.996\pm0.069(\rm stat.)^{+0.083}_{-0.078}(\rm syst.)$.[Refereed]Scientific journal - American Physical Society (APS), Jan. 2021, Physical Review D, 103(1) (1)[Refereed]Scientific journal
- Oct. 2020, Journal of High Energy Physics, 2020(10) (10), English[Refereed]Scientific journal
- American Physical Society (APS), Oct. 2020, Physical Review D, 102(7) (7)[Refereed]Scientific journal
- Springer Science and Business Media LLC, Aug. 2020, The European Physical Journal C, 80(8) (8)
Abstract An event topology with two secondary vertices compatible with the decay of short-lived particles was found in the analysis of neutrino interactions in the OPERA target. The observed topology is compatible with tau neutrino charged current (CC) interactions with charm production and neutrino neutral current (NC) interactions with$$c\overline{c}$$ $$\nu _{\tau }$$ [Refereed]Scientific journal - Jul. 2020, Phys.Rev.D, 102(1) (1), 012007 - 012007Scientific journal
- Jul. 2020, Physical Review D, 102(1) (1), English[Refereed]Scientific journal
- Jun. 2020, Physical Review D, 101(11) (11), English[Refereed]Scientific journal
- Jun. 2020, Physical Review D, 101(11) (11), English[Refereed]Scientific journal
- Apr. 2020, Physical Review Letters, 124(16) (16), English[Refereed]Scientific journal
- Apr. 2020, Nature, 580(7803) (7803), 339 - 344, English[Refereed]Scientific journal
- Mar. 2020, Eur. Phys. J. C, 80(3) (3), 284Measurement of the muon flux from 400 GeV/c protons interacting in a thick molybdenum/tungsten target[Refereed]
- Jan. 2020, Phys.Rev.D, 101(1) (1), 012007 - 012007[Refereed]Scientific journal
- Jan. 2020, JOURNAL OF HIGH ENERGY PHYSICS, 2001(1) (1), 033, English[Refereed]Scientific journal
- Jan. 2020, JOURNAL OF INSTRUMENTATION, 15(1) (1), Japanese
- Dec. 2019, Phys.Rev.D, 100(11) (11), 112009 - 112009[Refereed]Scientific journal
- Nov. 2019, JINST, 14(11) (11), P11028Fast simulation of muons produced at the SHiP experiment using Generative Adversarial Networks[Refereed]
- IOP Publishing, Oct. 2019, JCAP, 1910(10) (10), 003 - 003[Refereed]Scientific journal
- Sep. 2019, Progress of Theoretical and Experimental Physics, 2019[Refereed]Scientific journal
- Sep. 2019, JINST, 14(9) (9), P09009Development of a balloon-style pressure vessel gondola for balloon-borne emulsion gamma-ray telescopes[Refereed]
- Sep. 2019, Phys.Rev.D, 100(5) (5), 052006 - 052006[Refereed]Scientific journal
- American Physical Society (APS), Sep. 2019, Phys. Rev. D, 100(5) (5), 051301[Refereed]Scientific journal
- Jun. 2019, J.Phys.G, 46(8) (8), 08LT01, English[Refereed]Scientific journal
- American Physical Society (APS), Apr. 2019, Physical Review D, 99(7) (7)[Refereed]Scientific journal
- Apr. 2019, JHEP, 2019(04) (04), 077Sensitivity of the SHiP experiment to Heavy Neutral Leptons[Refereed]
- Mar. 2019, JINST, 14(3) (3), P03025The experimental facility for the Search for Hidden Particles at the CERN SPS[Refereed]
- American Physical Society, 2019, Physical Review Letters, (1) (1), EnglishScientific journal
- 2019, 26TH EXTENDED EUROPEAN COSMIC RAY SYMPOSIUM, 1181
- Nov. 2018, Advances in Space Research, 62(10) (10), 2945 - 2953GRAINE project, prospects for scientific balloon-borne experiments[Refereed]
- Oct. 2018, Phys.Rev.Lett., 121(17) (17), 171802 - 171802, English[Refereed]Scientific journal
- Aug. 2018, Phys.Rev.D, 98(3) (3), 032003 - 032003, English[Refereed]Scientific journal
- Jul. 2018, Phys.Rev.D, 98(1) (1), 012004 - 012004, English[Refereed]Scientific journal
- Abstract The OPERA experiment has discovered the tau neutrino appearance in the CNGS muon neutrino beam, in agreement with the 3 neutrino flavour oscillation hypothesis. The OPERA neutrino interaction target, made of Emulsion Cloud Chambers, was particularly efficient in the reconstruction of electromagnetic showers. Moreover, thanks to the very high granularity of the emulsion films, showers induced by electrons can be distinguished from those induced by π0s, thus allowing the detection of charged current interactions of electron neutrinos. In this paper the results of the search for electron neutrino events using the full dataset are reported. An improved method for the electron neutrino energy estimation is exploited. Data are compatible with the 3 neutrino flavour mixing model expectations and are used to set limits on the oscillation parameters of the 3+1 neutrino mixing model, in which an additional mass eigenstate m4 is introduced. At high Δm412 (≳0.1 eV2), an upper limit on sin2 2θμe is set to 0.021 at 90% C.L. and Δm412 ≳ 4 × 10− 3 eV2 is excluded for maximal mixing in appearance mode.Springer Science and Business Media LLC, Jun. 2018, Journal of High Energy Physics, 2018(6) (6)Scientific journal
- Oxford University Press (OUP), Jun. 2018, Prog. Theor. Exp. Phys., 2018(6) (6), 063H01[Refereed]Scientific journal
- American Physical Society (APS), May 2018, Physical Review Letters, 120(21) (21), 211801[Refereed]Scientific journal
- Feb. 2018, Phys.Rev.D, 97(3) (3), 032002 - 032002, English[Refereed]Scientific journal
- Jan. 2018, JHEP, 2018(6) (6), 151Final results of the search for νμ→νe oscillations with the OPERA detector in the CNGS beam[Refereed]
- Jan. 2018, Phys.Rev.D, 97(1) (1), 012001 - 012001, English[Refereed]Scientific journal
- 2018, Universe, 4(12) (12)Scientific journal
- 2018, European Physical Journal C, 78(9) (9)Scientific journal
- Springer New York LLC, Jan. 2018, European Physical Journal C, 78(1) (1), P05011, English[Refereed]Scientific journal
- Nov. 2017, Phys.Rev.D, 96(9) (9), 092006 - 092006, English[Refereed]Scientific journal
- Sep. 2017, Phys.Rev.D, 96(5) (5), 052001 - 052001, English[Refereed]Scientific journal
- Editrice Compositori s.r.l., Sep. 2017, Nuovo Cimento della Societa Italiana di Fisica C, 40(5) (5), English[Refereed]Scientific journal
- Jul. 2017, Phys.Rev.D, 96(1) (1), 011102 - 011102, English[Refereed]Scientific journal
- Jun. 2017, Phys.Rev.D, 95(11) (11), 111101 - 111101, English[Refereed]Scientific journal
- EDP Sciences, Jun. 2017, EPJ Web of Conferences, 145, English[Refereed]International conference proceedings
- Jun. 2017, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2017(6) (6), 063C02, English[Refereed]Scientific journal
- Jun. 2017, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2017(6) (6), 063H02, English[Refereed]Scientific journal
- May 2017, JOURNAL OF INSTRUMENTATION, 12(5) (5), P05011, English[Refereed]Scientific journal
- Apr. 2017, Phys.Rev.Lett., 118(15) (15), 151801 - 151801, English[Refereed]Scientific journal
- Jan. 2017, Phys.Rev.D, 95(1) (1), 012010 - 012010, English[Refereed]Scientific journal
- Sissa Medialab Srl, 2017, Proceedings of Science, EnglishMeasurement of cosmic ray nuclei with GRAINE2015International conference proceedings
- Nov. 2016, Phys.Rev.Lett., 117(19) (19), 192501 - 192501, English[Refereed]Scientific journal
- Oct. 2016, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 833, 165 - 168, English[Refereed]Scientific journal
- Jul. 2016, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2016(7) (7), 073F01, English[Refereed]Scientific journal
- Jul. 2016, JOURNAL OF INSTRUMENTATION, 11(7) (7), P07022, English[Refereed]Scientific journal
- Jun. 2016, Phys.Rev.D, 93(11) (11), 112012 - 112012, English[Refereed]Scientific journal
- May 2016, Phys.Rev.Lett., 116(18) (18), 181801 - 181801, English[Refereed]Scientific journal
- Apr. 2016, Phys.Rev.D, 93(7) (7), 072002 - 072002, English[Refereed]Scientific journal
- Jan. 2016, Phys.Rev.D, 93(1) (1), 012006 - 012006, English[Refereed]Scientific journal
- Dec. 2015, Phys.Rev.D, 92(11) (11), 112003 - 112003, English[Refereed]Scientific journal
- Dec. 2015, JOURNAL OF INSTRUMENTATION, 10(12) (12), P1208, English[Refereed]Scientific journal
- Sep. 2015, PHYSICAL REVIEW LETTERS, 115(12) (12), 121802, English[Refereed]Scientific journal
- Jun. 2015, Phys.Rev.D, 91(11) (11), 112010 - 112010, English[Refereed]Scientific journal
- Jun. 2015, Phys.Rev.D, 91(11) (11), 112002 - 112002, English[Refereed]Scientific journal
- Jun. 2015, JOURNAL OF HIGH ENERGY PHYSICS, 1506(6) (6), 69, English[Refereed]Scientific journal
- May 2015, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2015(5) (5), 053C01, English[Refereed]Scientific journal
- Apr. 2015, Phys.Rev.D, 91(7) (7), 072010 - 072010, English[Refereed]Scientific journal
- Apr. 2015, PTEP, 2015(4) (4), 043C01, English[Refereed]Scientific journal
- Apr. 2015, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2015(4) (4), 043H01, English[Refereed]Scientific journal
- Mar. 2015, Phys.Rev.D, 91(5) (5), 051102 - 051102, English[Refereed]Scientific journal
- 2015, NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS, 267, 87 - 93, Japanese
- Dec. 2014, Phys.Rev.Lett., 113(24) (24), 241803 - 241803, English[Refereed]Scientific journal
- Oct. 2014, Phys.Rev.D, 90(7) (7), 072012 - 072012, English[Refereed]Scientific journal
- Oct. 2014, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 2014(10) (10), 101C01, English[Refereed]Scientific journal
- Sep. 2014, Phys.Rev.D, 90(5) (5), 052010 - 052010, English[Refereed]Scientific journal
- Aug. 2014, EUROPEAN PHYSICAL JOURNAL C, 74(8) (8), 2986, English[Refereed]Scientific journal
- Jul. 2014, EUROPEAN PHYSICAL JOURNAL C, 74(7) (7), 2933, English[Refereed]Scientific journal
- May 2014, Phys.Rev.Lett., 112(18) (18), 181801 - 181801, English[Refereed]Scientific journal
- May 2014, Phys.Rev.D, 89(9) (9), 092003 - 092003, English[Refereed]Scientific journal
- Mar. 2014, PHYSICAL REVIEW D, 89(5) (5), 51102, English[Refereed]Scientific journal
- Feb. 2014, Phys.Rev.Lett., 112(6) (6), 061802 - 061802, English[Refereed]Scientific journal
- 2014, Nuclear Physics B - Proceedings Supplements, 246-247[Refereed]Scientific journal
- Springer Heidelberg, 2014, Journal of High Energy Physics, 2014(4) (4), English[Refereed]Scientific journal
- Nov. 2013, Phys.Rev.Lett., 111(21) (21), 211803 - 211803, English[Refereed]Scientific journal
- Nov. 2013, JOURNAL OF HIGH ENERGY PHYSICS, 1311(11) (11), 36, English[Refereed]Scientific journal
- Aug. 2013, Phys.Rev.D, 88(3) (3), 032002 - 032002, English[Refereed]Scientific journal
- Jul. 2013, PHYSICAL REVIEW C, 88(1) (1), 14003, English[Refereed]Scientific journal
- May 2013, Phys.Rev.D, 87(9) (9), 092003 - 092003, English[Refereed]Scientific journal
- Feb. 2013, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 701, 127 - 132, English[Refereed]Scientific journal
- Jan. 2013, Phys.Rev.D, 87(1) (1), 012001 - 012001, English[Refereed]Scientific journal
- Jan. 2013, PHYSICAL REVIEW D, 87(1) (1), English[Refereed]
- 2013, Journal of High Energy Physics, 1 - 3, English[Refereed]Scientific journal
- Jan. 2013, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 698, 135 - 146, English[Refereed]Scientific journal
- Jan. 2013, JOURNAL OF HIGH ENERGY PHYSICS, 1301(1) (1), 153, English[Refereed]Scientific journal
- 2013, Journal of High Energy Physics, 2013(7) (7), 4, English[Refereed]Scientific journal
- Dec. 2012, Nucl.Instrum.Meth.A, 694, 211 - 223, English[Refereed]Scientific journal
- Oct. 2012, JOURNAL OF HIGH ENERGY PHYSICS, Vol. 1210, p. 093(10) (10), English[Refereed]Scientific journal
- Mar. 2012, NEW JOURNAL OF PHYSICS, 14, English[Refereed]Scientific journal
- Feb. 2012, Phys.Rev.D, 85, 031103 - 031103, English[Refereed]Scientific journal
- Jan. 2012, NEW JOURNAL OF PHYSICS, 14, English[Refereed]Scientific journal
- Dec. 2011, Nucl.Instrum.Meth.A, 659, 106 - 135, English[Refereed]Scientific journal
- Sep. 2011, NEW JOURNAL OF PHYSICS, 13, English[Refereed]Scientific journal
- Jul. 2011, Phys.Rev.Lett., 107, 041801 - 041801, English[Refereed]Scientific journal
- May 2011, NEW JOURNAL OF PHYSICS, 13, English[Refereed]Scientific journal
- Mar. 2011, Phys.Rev.D, 83, 054023 - 054023, English[Refereed]Scientific journal
- Feb. 2011, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 628(1) (1), 260 - 263, English[Refereed]International conference proceedings
- Nov. 2010, NEW JOURNAL OF PHYSICS, 12, English[Refereed]Scientific journal
- Aug. 2010, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 620(2-3) (2-3), 192 - 195, English[Refereed]Scientific journal
- Jul. 2010, ACTA PHYSICA POLONICA B, 41(7) (7), 1579 - 1584, EnglishTHE SMRD SUBDETECTOR AT THE T2K NEAR DETECTOR STATION[Refereed]Scientific journal
- Jul. 2010, PHYSICS LETTERS B, 691(3) (3), 138 - 145, English[Refereed]Scientific journal
- May 2010, EUROPEAN PHYSICAL JOURNAL C, 67(1-2) (1-2), 25 - 37, English[Refereed]Scientific journal
- Sep. 2009, NUCLEAR PHYSICS A, 828(3-4) (3-4), 191 - 232, English[Refereed]Scientific journal
- Jun. 2009, JOURNAL OF INSTRUMENTATION, 4, English[Refereed]Scientific journal
- Apr. 2009, JOURNAL OF INSTRUMENTATION, 4, English[Refereed]Scientific journal
- Dec. 2008, Physical Review C - Nuclear Physics, 78(6) (6), English[Refereed]Scientific journal
- Sep. 2008, PHYSICAL REVIEW D, 78(5) (5), English[Refereed]Scientific journal
- Aug. 2008, Phys.Rev.D, 78, 032003 - 032003, English[Refereed]Scientific journal
- Jul. 2008, JOURNAL OF INSTRUMENTATION, 3, English[Refereed]Scientific journal
- Jul. 2008, NUCLEAR PHYSICS B, 798(1-2) (1-2), 1 - 16, English[Refereed]Scientific journal
- Jul. 2008, JOURNAL OF INSTRUMENTATION, 3, English[Refereed]Scientific journal
- Apr. 2008, Nuclear Physics B, 793(1-2) (1-2), 326 - 343[Refereed]Scientific journal
- Feb. 2008, Phys.Rev.D, 77, 032003 - 032003, English[Refereed]Scientific journal
- Nov. 2007, EUROPEAN PHYSICAL JOURNAL C, 52(3) (3), 543 - 552, English[Refereed]Scientific journal
- Sep. 2007, EUROPEAN PHYSICAL JOURNAL A, 33(3) (3), 265 - 268, English[Refereed]Scientific journal
- Aug. 2007, EUROPEAN PHYSICAL JOURNAL C, 51(4) (4), 775 - 785, English[Refereed]Scientific journal
- May 2007, Physical Review C - Nuclear Physics, 75(5) (5), English[Refereed]Scientific journal
- Apr. 2007, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 574(1) (1), 192 - 198, English[Refereed]Scientific journal
- Dec. 2006, NEW JOURNAL OF PHYSICS, 8, English[Refereed]Scientific journal
- Oct. 2006, Phys.Rev.D, 74, 072003 - 072003, English[Refereed]Scientific journal
- Sep. 2006, Phys.Rev.D, 74, 052002 - 052002, English[Refereed]Scientific journal
- May 2006, Phys.Rev.Lett., 96, 181801 - 181801, English[Refereed]Scientific journal
- Feb. 2006, PHYSICS LETTERS B, 633(2-3) (2-3), 214 - 218, English[Refereed]Scientific journal
- Jan. 2006, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 556(2) (2), English[Refereed]Scientific journal
- Jan. 2006, PHYSICS LETTERS B, 632(1) (1), 65 - 75, English[Refereed]Scientific journal
- Dec. 2005, Phys.Rev.Lett., 95, 252301 - 252301, English[Refereed]Scientific journal
- Dec. 2005, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 52(6) (6), 2992 - 2997, English[Refereed]Scientific journal
- Oct. 2005, PHYSICS LETTERS B, 626, 24 - 34, English[Refereed]Scientific journal
- Jul. 2005, Phys.Lett.B, 619, 255 - 262, English[Refereed]Scientific journal
- Jul. 2005, NUCLEAR PHYSICS B, 718(1-2) (1-2), 35 - 54, English[Refereed]Scientific journal
- May 2005, PHYSICS LETTERS B, 613(3-4) (3-4), 105 - 117, English[Refereed]Scientific journal
- May 2005, PHYSICS LETTERS B, 614(3-4) (3-4), 155 - 164, English[Refereed]Scientific journal
- Mar. 2005, Phys.Rev.Lett., 94, 081802 - 081802, English[Refereed]Scientific journal
- Dec. 2004, PHYSICS LETTERS B, 604(3-4) (3-4), 145 - 156, English[Refereed]Scientific journal
- Dec. 2004, PHYSICS LETTERS B, 604(1-2) (1-2), 11 - 21, English[Refereed]Scientific journal
- Aug. 2004, PHYSICS LETTERS B, 596(1-2) (1-2), 44 - 53, English[Refereed]Scientific journal
- Jul. 2004, Phys.Rev.Lett., 93, 051801 - 051801, English[Refereed]Scientific journal
- Jan. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 516(1) (1), 21 - 33, English[Refereed]Scientific journal
- Nov. 2003, PHYSICS LETTERS B, 575(3-4) (3-4), 198 - 207, English[Refereed]Scientific journal
- Sep. 2003, EUROPEAN PHYSICAL JOURNAL C, 30(2) (2), 159 - 167, English[Refereed]Scientific journal
- Mar. 2003, PHYSICS LETTERS B, 555(3-4) (3-4), 156 - 166, English[Refereed]Scientific journal
- Feb. 2003, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 497(2-3) (2-3), 450 - 466, English[Refereed]Scientific journal
- Jan. 2003, Physical Review Letters, 90(4) (4), 418011 - 418015Indications of neutrino oscillation in a 250 km long-baseline experiment[Refereed]Scientific journal
- Jan. 2003, Phys.Rev.Lett., 90, 041801 - 041801, English[Refereed]Scientific journal
- Nov. 2002, PHYSICS LETTERS B, 549(1-2) (1-2), 48 - 57, EnglishDetermination of the semi-leptonic branching fraction of charm hadrons produced in neutrino charged-current interactions[Refereed]Scientific journal
- Nov. 2002, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 493(1-2) (1-2), 45 - 66, EnglishDetection and analysis of tau-neutrino interactions in DONUT emulsion target[Refereed]Scientific journal
- Sep. 2002, International Journal of Modern Physics A, 17(24) (24), 3393 - 3402, English[Refereed]International conference proceedings
- Aug. 2002, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 488(1-2) (1-2), 144 - 154, EnglishThe large area emulsion tracker of the CHORUS experiment[Refereed]Scientific journal
- Jul. 2002, PHYSICS LETTERS B, 539(3-4) (3-4), 188 - 196, EnglishObservation of one event with the characteristics of associated charm production in neutrino charged-current interactions[Refereed]Scientific journal
- May 2002, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 483(3) (3), 689 - 697, EnglishScintillating-fiber-block detector for studying double-strangeness nuclei[Refereed]Scientific journal
- Feb. 2002, PHYSICS LETTERS B, 527(3-4) (3-4), 173 - 181, EnglishMeasurement of D-0 production in neutrino charged-current interactions[Refereed]Scientific journal
- Nov. 2001, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 473(1-2) (1-2), 192 - 196, English[Refereed]International conference proceedings
- Nov. 2001, PHYSICAL REVIEW LETTERS, 87(21) (21), English[Refereed]Scientific journal
- Jul. 2001, Phys.Lett.B, 511, 178 - 184, English[Refereed]Scientific journal
- Jul. 2001, PHYSICS LETTERS B, 513(1-2) (1-2), 23 - 29, EnglishA new upper limit for the tau-neutrino magnetic moment[Refereed]Scientific journal
- Apr. 2001, PHYSICS LETTERS B, 504(3) (3), 218 - 224, EnglishObservation of tau neutrino interactions[Refereed]Scientific journal
- Mar. 2001, PHYSICS LETTERS B, 503(1-2) (1-2), 1 - 9, EnglishObservation of weak neutral current neutrino production of J/psi[Refereed]Scientific journal
- Feb. 2001, PHYSICS LETTERS B, 500(1-2) (1-2), 37 - 46, EnglishProduction of twin Lambda-hypernuclei from Xi(-) hyperon capture at rest[Refereed]Scientific journal
- Jan. 2001, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 497(1-2) (1-2), 8 - 22[Refereed]Scientific journal
- Nov. 2000, PHYSICAL REVIEW C, 62(5) (5), EnglishH-dibaryon and hypernucleus formation in the Xi C-12 reaction at rest[Refereed]Scientific journal
- Jun. 2000, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 447(3) (3), 361 - 376, EnglishNuclear emulsions in a large, hybrid experiment (CHORUS) to search for nu(mu) -> nu(tau) oscillations[Refereed]Scientific journal
- 2000, Physical Review C - Nuclear Physics, 62(5) (5), 12, English[Refereed]Scientific journal
- Dec. 1998, NUCLEAR PHYSICS A, 644(4) (4), 365 - 385, EnglishQuasifree p(K-,K+)Xi(-) reaction in nuclear emulsion[Refereed]Scientific journal
- Dec. 1998, PHYSICS LETTERS B, 444(3-4) (3-4), 267 - 272, EnglishEnhanced Lambda Lambda production near threshold in the C-12(K-,K+) reaction[Refereed]Scientific journal
- Nov. 1998, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 417(2-3) (2-3), 220 - 229, EnglishScintillating microfibers as a high-resolution tracking detector for hybrid-emulsion experiment[Refereed]Scientific journal
- Sep. 1998, PHYSICS LETTERS B, 435(3-4) (3-4), 458 - 464, EnglishObservation of neutrino induced diffractive D-s*(+) production and subsequent decay D-s*(+)-> D-s(+)->tau(+)->mu(+)[Refereed]Scientific journal
- Aug. 1998, PHYSICS LETTERS B, 434(1-2) (1-2), 205 - 213, EnglishSearch for nu(mu) -> nu(tau) oscillation using the tau decay modes into a single charged particle[Refereed]Scientific journal
- Aug. 1998, PHYSICAL REVIEW C, 58(2) (2), 1306 - 1309, EnglishCascade hypernuclei in the (K-,K+) reaction on C-12[Refereed]Scientific journal
- Jul. 1998, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 412(1) (1), 19 - 37, EnglishThe CHORUS scintillating fiber tracker and opto-electronic readout system[Refereed]Scientific journal
- Apr. 1998, PHYSICS LETTERS B, 424(1-2) (1-2), 202 - 212, EnglishA search for nu(mu)->nu(tau) oscillation[Refereed]Scientific journal
- Dec. 1997, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 401(1) (1), 7 - 44, EnglishThe CHORUS experiment to search for nu(mu)->nu(tau) oscillation[Refereed]Scientific journal
- Oct. 1997, NUCLEAR PHYSICS A, 625(1-2) (1-2), 231 - 250, EnglishScalar and vector meson production and two-step processes in the (K-,K+) reaction on C-12[Refereed]Scientific journal
- 1997, INTERSECTIONS BETWEEN PARTICLE AND NUCLEAR PHYSICS - 6TH CONFERENCE, (412) (412), 923 - 926, EnglishEnhanced production of Lambda Lambda pairs near threshold in (K-, K+) reaction[Refereed]International conference proceedings
- Elsevier, Aug. 1996, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 382(3) (3), 299 - 304, English[Refereed]Scientific journal
- Elsevier, Jun. 1996, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 378(1-4) (1-4), 53 - 58, English[Refereed]Scientific journal
- Dec. 1995, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 367(1-3) (1-3), 367 - 371, EnglishPerformance and calibration of the CHORUS scintillating fiber tracker and opto-electronics readout system[Refereed]Scientific journal
- Sep. 1995, NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS, 108(9) (9), 1125 - 1141, EnglishCHARGED-PARTICLE MULTIPLICITY AND TRANSVERSE ENERGY MEASURED IN S-32 CENTRAL INTERACTIONS AT 200 GEV PER NUCLEON[Refereed]Scientific journal
- Jul. 1995, PHYSICS LETTERS B, 355(1-2) (1-2), 45 - 51, English[Refereed]Scientific journal
- Feb. 1995, PHYSICS LETTERS B, 345(1) (1), 85 - 92, English[Refereed]Scientific journal
- 1995, PHOTOELECTRONIC DETECTORS, CAMERAS, AND SYSTEMS, 2551, 28 - 39, EnglishThe chorus scintillating fiber tracker and opto-electronics readout system[Refereed]International conference proceedings
- 1995, INTERSECTIONS BETWEEN PARTICLE AND NUCLEAR PHYSICS, (338) (338), 526 - 532, EnglishH-dibaryon search with a scintillating fiber live target[Refereed]International conference proceedings
- Nov. 1994, NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS, 107(11) (11), 2415 - 2420, English[Refereed]Scientific journal
- Sep. 1994, PHYSICS LETTERS B, 336(3-4) (3-4), 605 - 613, English[Refereed]Scientific journal
- Apr. 1994, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 344(1) (1), 143 - 148, EnglishSCINTILLATING-FIBER TRACKERS WITH OPTOELECTRONIC READOUT FOR THE CHORUS NEUTRINO EXPERIMENT[Refereed]Scientific journal
- 1994, Il Nuovo Cimento A Series 11, 107(11) (11), 2415 - 2420, English[Refereed]Scientific journal
- 1994, Nuclear Inst. and Methods in Physics Research, B, 93(3) (3), 340 - 354, English[Refereed]Scientific journal
- Oct. 1993, Physics Letters B, 316(2-3) (2-3), 455 - 462, English[Refereed]Scientific journal
- Oct. 1993, Physics Letters B, 316(1) (1), 188 - 196, English[Refereed]Scientific journal
- Aug. 1993, Physics Letters B, 313(1-2) (1-2), 260 - 266, English[Refereed]Scientific journal
- Jul. 1993, Physics Letters B, 309(3-4) (3-4), 483 - 491, English[Refereed]Scientific journal
- Apr. 1993, Physics Letters B, 303(3-4) (3-4), 359 - 367, English[Refereed]Scientific journal
- We report on the characteristics of 9 bb^^- pair events produced by a 600 GeV/c π^- beam and detected in the hybrid emulsion spectrometer of Fermilab experiment E653. The measured lifetimes for samples of 12 neutral and 6 charged beauty hadrons are τ_Published for the Research Institute for Fundamental Physics by Physical Society of Japan, Mar. 1993, Prog. Theor. Phys., 89(3) (3), 679 - 696, English[Refereed]
- Feb. 1993, PROGRESS OF THEORETICAL PHYSICS, 89(2) (2), 493 - 500, English[Refereed]Scientific journal
- 1993, SCINTILLATING FIBER TECHNOLOGY AND APPLICATIONS, 2007, 106 - 115, EnglishTHE SCINTILLATING-FIBER TRACKER SYSTEM OF THE CHORUS EXPERIMENT[Refereed]International conference proceedings
- Jan. 1993, PROGRESS OF THEORETICAL PHYSICS, 89(1) (1), 131 - 138, English[Refereed]Scientific journal
- Sep. 1992, NUCLEAR PHYSICS A, 547(1-2) (1-2), C211 - C216, EnglishSEARCH FOR H-DIBARYON BY SCINTILLATING FIBER TRACK DETECTOR[Refereed]Scientific journal
- Aug. 1992, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 39(4) (4), 680 - 684, EnglishRESEARCH-AND-DEVELOPMENT OF SCINTILLATING FIBER TRACKER FOR NU-MU-NU-TAU OSCILLATION EXPERIMENT[Refereed]Scientific journal
- Jul. 1992, Physics Letters B, 286(1-2) (1-2), 187 - 194, English[Refereed]Scientific journal
- Jun. 1992, PHYSICS LETTERS B, 284(3-4) (3-4), 461 - 470, EnglishCHARM MESON PRODUCTION IN 600 GEV/C PI-EMULSION INTERACTIONS[Refereed]Scientific journal
- May 1992, PROGRESS OF THEORETICAL PHYSICS, 87(5) (5), 1305 - 1313, English[Refereed]Scientific journal
- May 1992, PROGRESS OF THEORETICAL PHYSICS, 87(5) (5), 1315 - 1322, English[Refereed]Scientific journal
- Jan. 1992, Physics Letters B, 274(2) (2), 246 - 252, English[Refereed]Scientific journal
- Jul. 1991, PHYSICS LETTERS B, 263(3-4) (3-4), 579 - 583, English[Refereed]Scientific journal
- Jul. 1991, PHYSICS LETTERS B, 263(3-4) (3-4), 573 - 578, English[Refereed]Scientific journal
- Jun. 1991, PROGRESS OF THEORETICAL PHYSICS, 85(6) (6), 1287 - 1298, EnglishDIRECT OBSERVATION OF SEQUENTIAL WEAK DECAY OF A DOUBLE HYPERNUCLEUS[Refereed]Scientific journal
- May 1991, PROGRESS OF THEORETICAL PHYSICS, 85(5) (5), 951 - 956, EnglishEVIDENCE OF WEAK DECAY OF HEAVY DOUBLE HYPERNUCLEI[Refereed]Scientific journal
- Apr. 1991, PHYSICAL REVIEW LETTERS, 66(14) (14), 1819 - 1822, EnglishMEASUREMENT OF THE RELATIVE BRANCHING FRACTION GAMMA(D0-]K-MU-V)GAMMA(D0-]MU-X)[Refereed]Scientific journal
- 1991, CONFERENCE RECORD OF THE 1991 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE, VOLS 1-3, 264 - 268, EnglishRESEARCH-AND-DEVELOPMENT OF SCINTILLATING FIBER TRACKER FOR V-MU-V-TAU OSCILLATION EXPERIMENT[Refereed]International conference proceedings
- Apr. 1990, Nuclear Inst. and Methods in Physics Research, A, 289(1-2) (1-2), 146 - 167, English[Refereed]Scientific journal
- 1990, Nuclear Inst. and Methods in Physics Research, B, 51(4) (4), 466 - 472, English[Refereed]Scientific journal
- 1990, Physical Review Letters, 65(14) (14), 1729 - 1732, English[Refereed]Scientific journal
- Jan. 1989, Nuclear Inst. and Methods in Physics Research, A, 274(1-2) (1-2), 64 - 78, English[Refereed]Scientific journal
- Jul. 1988, PHYSICS LETTERS B, 209(1) (1), 113 - 118, English[Refereed]Scientific journal
- May 1988, PHYSICS LETTERS B, 206(2) (2), 380 - 384, English[Refereed]Scientific journal
- May 1988, PHYSICS LETTERS B, 206(2) (2), 375 - 379, English[Refereed]Scientific journal
- Mar. 1987, Physics Letters B, 187(1-2) (1-2), 185 - 190, English[Refereed]Scientific journal
- 1986, Physical Review Letters, 57(23) (23), 2897 - 2900, English[Refereed]Scientific journal
- 1986, Physical Review Letters, 56(17) (17), 1767 - 1770, English[Refereed]Scientific journal
- 1986, Physical Review Letters, 56(17) (17), 1771 - 1774, English[Refereed]Scientific journal
- 1985, PHYSICS LETTERS B, 158(2) (2), 186 - 192, English[Refereed]Scientific journal
- J-PARC Neutrino Beamline Upgrade Technical Design ReportIn this document, technical details of the upgrade plan of the J-PARC14 Aug. 2019
neutrino beamline for the extension of the T2K experiment are described. T2K
has proposed to accumulate data corresponding to $2\times{}10^{22}$
protons-on-target in the next decade, aiming at an initial observation of CP
violation with $3\sigma$ or higher significance in the case of maximal CP
violation. Methods to increase the neutrino beam intensity, which are necessary
to achieve the proposed data increase, are described.Technical report - T2K ND280 Upgrade - Technical Design ReportIn this document, we present the Technical Design Report of the Upgrade of12 Jan. 2019
the T2K Near Detector ND280. The goal of this upgrade is to improve the Near
Detector performance to measure the neutrino interaction rate and to constrain
the neutrino interaction cross-sections so that the uncertainty in the number
of predicted events at Super-Kamiokande is reduced to about 4%. This will allow
to improve the physics reach of the T2K-II project. This goal is achieved by
modifying the upstream part of the detector, adding a new highly granular
scintillator detector (Super-FGD), two new TPCs (High-Angle TPC) and six TOF
planes. Details about the detector concepts, design and construction methods
are presented, as well as a first look at the test-beam data taken in Summer
2018. An update of the physics studies is also presented.Technical report - Japan Radioisotope Association, 2019, RADIOISOTOPES, 68(12) (12), 877 - 891, Japanese
We are developing GRAINE project, 10 MeV–100 GeV cosmic γ-ray observations with a precise (0.08 degree @1–2 GeV) and polarization sensitive large-aperture-area (～10 m2) emulsion telescope by repeating long duration balloon flights. An overview, status and prospect of our project are described.
- The Physical Society of Japan, 2018, Meeting Abstracts of the Physical Society of Japan, 73, 101 - 101, Japanese
- The Physical Society of Japan, 2018, Meeting Abstracts of the Physical Society of Japan, 73, 106 - 106, Japanese
- 日本物理学会, Oct. 2017, 日本物理学会誌 = Butsuri, 72(10) (10), 734 - 742, JapaneseA Development of Time-Resolved Emulsion Detector by Multi-Stage Shifter
- 29 Aug. 2017, CERN Document Server (Scientific Committee Paper), CERN-SPSC-2017-029, SPSC-P-354, EnglishTechnical report
- Proposal for an Extended Run of T2K to $20\times10^{21}$ POTRecent measurements by the T2K neutrino oscillation experiment indicate that14 Sep. 2016
CP violation in neutrino mixing may be observed in the future by long-baseline
neutrino oscillation experiments. We propose an extension to the currently
approved T2K running from $7.8\times 10^{21}~\mbox{POT}$ to $20\times
10^{21}~\mbox{POT}$, aiming at initial observation of CP violation with
3$\,\sigma$ or higher significance for the case of maximum CP violation. The
program also contains a measurement of mixing parameters, $\theta_{23}$ and
$\Delta m^2_{32}$, with a precision of 1.7$^\circ$ or better and 1%,
respectively. With accelerator and beamline upgrades, as well as analysis
improvements, this program would occur before the next generation of
long-baseline neutrino oscillation experiments that are expected to start
operation in 2026.Technical report - Sensitivity of the T2K accelerator-based neutrino experiment with an Extended run to $20\times10^{21}$ POTRecent measurements at the T2K experiment indicate that CP violation in27 Jul. 2016
neutrino mixing may be observed in the future by long-baseline neutrino
oscillation experiments. We explore the physics program of an extension to the
currently approved T2K running of $7.8\times 10^{21}$ protons-on-target to
$20\times 10^{21}$ protons-on-target,aiming at initial observation of CP
violation with 3$\,\sigma$ or higher significance for the case of maximum CP
violation. With accelerator and beam line upgrades, as well as analysis
improvements, this program would occur before the next generation of
long-baseline neutrino oscillation experiments that are expected to start
operation in 2026.Technical report - The Physical Society of Japan (JPS), 2016, Meeting Abstracts of the Physical Society of Japan, 71, 88 - 88, Japanese
- The Physical Society of Japan, 2016, Meeting Abstracts of the Physical Society of Japan, 71, 82 - 82, Japanese
我々は、低エネルギーでのニュートリノ反応断面積の測定と、将来的にはステライルニュートリノ問題に決着をつけることを目指している。そのためのテスト実験(J-PARC T60)を、2014年より段階的に行っている。本実験では、Sub-Multi GeVエネルギーのニュートリノビームを標的兼検出器であるECC(Emulsion cloud chamber)に照射し、顕微鏡ステージを用いてデータを自動取得し、ニュートリノ反応の解析を行っている。本講演では、2015年1月末から5月末にかけてビーム照射したECCの原子核乾板の現像結果について報告する。
- GRAINE計画 : 2015年豪州気球実験 全体報告大気球シンポジウム 平成27年度（2015年11月5-6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: 41名資料番号: SA6000044028レポート番号: isas15-sbs-028宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2015, 大気球シンポジウム: 平成27年度 = Balloon Symposium: 2015, Japanese
- GRAINE*計画：ロードマップと次回豪州フライトの目標 (*Gamma Ray Astro Imager with Nuclear Emulsion)大気球シンポジウム 平成27年度（2015年11月5-6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: 41名資料番号: SA6000044043レポート番号: isas15-sbs-043宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS), Nov. 2015, 大気球シンポジウム: 平成27年度 = Balloon Symposium: 2015, Japanese
- 応用物理学会放射線分科会, Apr. 2015, 放射線 = Ionizing radiation, 40(3) (3), 127 - 131, JapaneseThe development of time-resolved multi-stage shifter for GRAINE project, cosmic gamma-ray observation with emulsion telescope
- GRAINE計画：エマルション望遠鏡による宇宙ガンマ線観測計画大気球シンポジウム 平成26年度（2014年11月6-7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: 37名資料番号: SA6000021003レポート番号: isas14-sbs-003宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS), Nov. 2014, 大気球シンポジウム: 平成26年度 = Balloon Symposium: 2014, Japanese
- GRAINE計画：オーストラリア実験の準備状況1大気球シンポジウム 平成26年度（2014年11月6-7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: 40名資料番号: SA6000021004レポート番号: isas14-sbs-004宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS), Nov. 2014, 大気球シンポジウム: 平成26年度 = Balloon Symposium: 2014, Japanese
- GRAINE計画：オーストラリア実験準備状況2大気球シンポジウム 平成26年度（2014年11月6-7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: 38名資料番号: SA6000021005レポート番号: isas14-sbs-005宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS), Nov. 2014, 大気球シンポジウム: 平成26年度 = Balloon Symposium: 2014, Japanese
- Apr. 2014, JOURNAL OF HIGH ENERGY PHYSICS, (4) (4), EnglishOthers
- Nov. 2010, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 623(1) (1), 382 - 384, English
- The Physical Society of Japan (JPS), 01 Mar. 2010, Meeting abstracts of the Physical Society of Japan, 65(1) (1), 34 - 34, Japanese20aBD-10 Ξ identification with multiple scattering measurement in the nuclear emulsion (KEK-E373)
- The Physical Society of Japan (JPS), 03 Mar. 2009, Meeting abstracts of the Physical Society of Japan, 64(1) (1), 63 - 63, Japanese27aSJ-2 Study of double hypernucleus by Ξ^-capture on emulsion
- The Physical Society of Japan (JPS), 03 Mar. 2009, Meeting abstracts of the Physical Society of Japan, 64(1) (1), 89 - 89, Japanese28aSC-10 The Application of Automatic Scanning Method to ECC for Primary Electron and MSC Balloon Experiment Analysis
- The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63(2) (2), 49 - 49, Japanese20aSD-4 Study of single/double hypernucleus by Ξ^-capture on emulsion (KEK-E373)
- 日本写真学会, Aug. 2008, 日本写真学会誌, 71(4) (4), 256 - 258, JapaneseEmulsion hybrid telescope for cosmic gamma-ray observation
- 27 Mar. 2007, 応用物理学関係連合講演会講演予稿集, 54th(1) (1), 151, Japanese医療用炭素ビームの核破砕反応
- 2007, PROCEEDINGS OF THE IX INTERNATIONAL CONFERENCE ON HYPERNUCLEAR AND STRANGE PARTICLE PHYSICS, Vol. 33, No. 3, pp. 265-268, 113 - +, EnglishFirst observation of the Sigma N decay of the S=-2 system
- May 2006, NIRS-M (National Inst. of Radiological Sciences), (192) (192), 196 - 197, JapaneseStudy on the applications of emulsion technology for the purpose of astrophysics and medicine
- 2006, NEXT GENERATION OF SCIENTIFIC BALLOON MISSIONS, 37(11) (11), 2120 - 2124, English
- May 2005, NIRS-M (National Inst. of Radiological Sciences), (180) (180), 226 - 227, JapaneseStudy on the applications of emulsion technology for the purpose of astrophysics and medicine
- The Physical Society of Japan, 2005, Meeting Abstracts of the Physical Society of Japan, 60(0) (0), 81 - 81, Japanese
- Dec. 2004, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 535(1-2) (1-2), 147 - 151, English
- The Physical Society of Japan (JPS), 03 Mar. 2004, Meeting abstracts of the Physical Society of Japan, 59(1) (1), 29 - 29, Japanese27aZL-10 Study of Double-Strangeness Nuclei With Hybrid-Emulsion Method (KEKPS-E373)
- The Physical Society of Japan, 2004, Meeting Abstracts of the Physical Society of Japan, 59(0) (0), 54 - 54, Japanese
- 2004, 2004 IEEE Nuclear Science Symposium Conference Record, Vols 1-7, Vol. 52, No. 6, pp. 2992-2997, 1034 - 1038, EnglishDesign, construction, and initial performance of SciBar detector in K2K experiment
- Jun. 2003, NUCLEAR PHYSICS A, 721, 951C - 954C, English
- The Physical Society of Japan (JPS), 13 Aug. 2002, Meeting abstracts of the Physical Society of Japan, 57(2) (2), 59 - 59, JapaneseStudy of Double-Strangeness Nuclei with Hybrid-Emulsion Method(KEK-PSE373)
- 一般社団法人日本物理学会, 01 Mar. 2002, 日本物理学会講演概要集, 57(1) (1), 62 - 62, Japanese27pWK-2 ハイブリッド・エマルション法を用いたダブルストレンジネス核の研究(KEK-PS E373)I
- Aug. 2001, NUCLEAR PHYSICS A, 691(1-2) (1-2), 246C - 249C, EnglishStudy of double-strangeness nuclei with hybrid-emulsion Method(KEK-PS E373)
- 2001, HADRONS AND NUCLEI, 594, 180 - 188, EnglishDoubly strange nuclei by a hybrid-emulsion experiment E373 at KEK
- Oct. 2000, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 453(1-2) (1-2), 165 - 176, EnglishDesign, construction, and operation of SciFi tracking detector for K2K experiment
- The Physical Society of Japan (JPS), 15 Mar. 1999, 日本物理学会講演概要集, 54(1) (1), 56 - 56, Japaneseダブルハイパー核探査実験(KEK‐PS E373)
- The Physical Society of Japan (JPS), 05 Sep. 1998, Meeting abstracts of the Physical Society of Japan, 53(2) (2), 51 - 51, JapaneseEvaluation of scintillating fiber block detector for double strangeness experiment
- The Physical Society of Japan (JPS), 05 Sep. 1998, Meeting abstracts of the Physical Society of Japan, 53(2) (2), 50 - 50, JapaneseStudy of double-strangeness nuclei with hybrid-emulsionmethod
- Aug. 1998, NUCLEAR PHYSICS A, 639(1-2) (1-2), 379C - 384C, EnglishEnhanced production of Lambda Lambda pairs near threshold in the (K-,K+) reaction on C-12
- The Physical Society of Japan, 1998, Meeting Abstracts of the Physical Society of Japan, 53(0) (0), 53 - 53, Japanese
- 一般社団法人 日本物理学会, 1998, 日本物理学会講演概要集, 53(0) (0), 53 - 53, Japanese
- The Physical Society of Japan (JPS), 02 Sep. 1997, Meeting abstracts of the Physical Society of Japan, 52(2) (2), 54 - 54, Japanese20p-D-5 R&D of the Tracking Detector using Scintillating Micro Fibers for the Scintillating Fiber-Emulsion Hybrid Experiment
- Società Italiana di Fisica, Sep. 1995, Il Nuovo Cimento A, 108(9) (9), 1125 - 1141, English
- Jun. 1995, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 360(1-2) (1-2), 254 - 257, English
- A search for non-statistical fluctuations was performed in 200 GeV per nucleon oxygen and sulphur ion-emulsion interactions selected by a high transverse energy trigger. No clear signal of dynamical correlations or of unusual fluctuations was found. © 1990.Elsevier BV, Dec. 1990, Physics Letters B, 252(2) (2), 303 - 310[Refereed]
- 01 Oct. 1990, Nuclear Physics, Section B, 342(2) (2), 279 - 301, English[Refereed]
- 06 Jul. 1989, Physics Letters B, 224(4) (4), 441 - 444, English[Refereed]
- 1986, NUCLEAR TRACKS AND RADIATION MEASUREMENTS, 12(1-6) (1-6), 249 - 252, EnglishCOMPUTER-AIDED EMULSION ANALYSIS SYSTEM TO STUDY EVENTS WITH PRODUCTION CROSS-SECTION OF NANO BARN
- 1986, International Journal of Radiation Applications and Instrumentation. Part, 12(1-6) (1-6), 249 - 252, English
- ICMaSS2023 (International Conference on Materials and Systems for Sustainability 2023), Dec. 2023, EnglishGRAINE Project: Balloon-borne Gamma-ray Telescope with Nuclear Emulsion[Invited]
- International Conference on the Physics of the Two Infinities, Mar. 2023GRAINE project: Cosmic gamma-ray observation by balloon-borne emulsion telescope[Invited]
- The 5th KMI International Symposium (KMI2023), Feb. 2023GRAINE: Cosmic Gamma-ray Observation by Balloon-Borne Telescope with Nuclear Emulsion[Invited]
- ICMaSS2021 (International Conference on Materials and Systems for Sustainability 2021), Nov. 2021, EnglishGRAINE Project: Balloon-borne Gamma-ray Telescope with Nuclear Emulsion[Invited]Invited oral presentation
- ICMaSS 2019, Nov. 2019GRAINE Project: Balloon-borne Gamma-ray Telescope with Nuclear EmulsionOral presentation
- 宇宙線研究者会議(CRC) 将来計画タウンミーティング, Mar. 2017, English, 東京大学柏図書館メディアホール, Domestic conferenceGRAINE project: Cosmic Gamma-ray Observation by Balloon-Borne Telescope with Nuclear EmulsionOral presentation
- The 3rd KMI International Symposium on "Quest for the Origin of Particles and the Universe", Jan. 2017, English, Nagoya University, Japan, International conferenceGRAINE project: Cosmic Gamma-ray Observation by Balloon-Borne Telescope with Nuclear Emulsion[Invited]Invited oral presentation
- NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS, Oct. 2015, English, ELSEVIER SCIENCE BV, The OPERA experiment was designed to study v mu -> v(tau) oscillations in appearance mode using the CERN to Gran Sasso high energy neutrino beam. From 2008 to 2012, 19505 CNGS neutrino interactions were recorded in the OPERA detector. At the present status of the analysis, 4 v(tau) candidate events have been observed, establishing the oscillation mechanism in the atmospheric sector with a significance of 4.2 sigma. The oscillation analysis will be presented in detail and the candidate events will be described. The final measurement of the atmospheric muon charge ratio in the TeV region will be also reported.The OPERA experiment
- 「ニュートリノフロンティア」研究会, Dec. 2014, English, 富士カーム, Domestic conferenceGRAINE project: First massive production and use of "High sensitive emulsion gel film"Oral presentation
- 26th International Conference on Nuclear Tracks in Solids, Sep. 2014, English, Integrated Research Center, Kobe University, Japan, International conferenceGRAINE project: Gamma-Ray Astro-Imager with Nuclear Emulsion.Oral presentation
- 宇宙線研究者会議(CRC) 将来計画タウンミーティング, Mar. 2014, Japanese, Domestic conferenceGRAINE計画 Gamma-Ray Astro-Imager with Nuclear EmulsionOral presentation
- NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS, Jan. 2014, English, ELSEVIER SCIENCE BV, The Tokai to Kamioka (T2K) experiment studies neutrino oscillations using a beam of muon neutrinos produced by an accelerator. The neutrinos travel from J-PARC on the east coast of Japan and are detected 295 kilometers further away in the Super-Kamiokande detector. A complex of near detectors located 280 meters away from the neutrino production target is used to better characterize the neutrino beam and reduce systematic uncertainties. The experiment aims at measuring electronic neutrino appearance (nu(mu) ->nu(e) oscillation) to measure the neutrino mixing angle theta(13), and muon neutrino disappearance to measure the neutrino mixing angle theta(23) and mass splitting vertical bar Delta m(32)(2)vertical bar. We report here electron neutrino appearance results using three years of data, recorded until the 2012 summer, as well as muon neutrino disappearance results based on the data coming from the first two years of the experiment.Recent Results from the T2K Experiment
- 66th Fujihara Seminar: X-raying the Gamma-Ray Universe, Nov. 2013, English, Hakone-Yumoto, Kanagawa-ken, Japan, International conferenceGRAINE project: Cosmic Gamma-Ray Observation with Balloon-Borne Telescope with Nuclear Emulsion.Oral presentation
- Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013, 2013GRAINE project: The first demonstration of emulsion gamma-ray telescope in 2011 balloon experiment
- Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013, 2013GRAINE project: The observation of cosmic gamma-rays with balloon-borne emulsion telescope
- International Workshop on "Double Beta Decay and Neutrinos", Nov. 2011, English, Crystal Tower, Osaka Business Park, Osaka, Japan, International conferenceResults from T2K Experiment.[Invited]Invited oral presentation
- Nuclear Physics B - Proceedings Supplements, 2009, English, ElsevierGamma ray observation with emulsion hybrid telescope
- 「粒子線と物質の相互作用に関する新たなる展開を目指す総合研究」成果報告会, Mar. 2008, Japanese, 岡山理科大学, Domestic conferenceRecent development on nuclear emulsion technique and its applicationOral presentation
- LP01 (XX International Symposium on Lepton and Photon Interactions at High Energies), Jul. 2001, English, Laboratori Nazionali di Frascati, Universita' di Roma, Rome, イタリア, International conferenceExperimental Review of Neutrino Physics.Invited oral presentation
- FCP01 (Frontiers in Contemporary Physics – II), Mar. 2001, English, Vanderbilt University, Nashville, TN, アメリカ合衆国, International conferenceOPERA: An Appearance Experiment for \nu\mu to \nu\tau OscillationInvited oral presentation
- VERTEX 2000 (9th International Workshop on Vertex Detectors), Sep. 2000, English, Purdue University, Sleeping Bear Dunes National Lakeshore MI, アメリカ合衆国, International conferenceTracking and Vertex Reconstruction in Modern Emulsion Experiments.Invited oral presentation
- The Society of Photography and Imaging of JapanOct. 2010 - Present
- The Physical Society of JapanAug. 1985 - Present
- 日本学術振興会, 科学研究費助成事業, 基盤研究(A), 神戸大学, 05 Apr. 2021 - 31 Mar. 2024多段シフターによる時間分解原子核乾板検出器の実現と宇宙ガンマ線観測への展開
- 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), Nagoya University, 29 Jun. 2018 - 31 Mar. 2023Study of Nuclear Emulsion production for precise measurements of neutrino properties名古屋大学Ｆ研究室内に既存の原子核乳剤製造装置の10倍の製造能力を持つ新装置を立ち上げ、ニュートリノ実験で用いる原子核乳剤の供給体制の構築を目的にした研究を行っている。2020年度は、2019年度に整備した、メインタンク、(脱塩)水洗タンク、化学増感(後熟)タンクを連動して一連の工程を新装置群で行うべく、装置間の配管整備、操作盤の整備を行った。各タンクの洗浄の効率化、工程の効率化を進めた。一連の装置が揃ったので乳剤製造部屋の暗室化、隣接した調液準備室の整備を行った。 しかし、原子核乳剤製造の3つの工程の第2工程である脱塩・分散工程のところで原子核乳剤が水と均一に混じらない分散不良が生じた。これを改善すべく原子核乳剤の攪拌の仕方、攪拌プロペラの形状変更、原子核乳剤の分散処理用の水酸化ナトリウムの添加の仕方を調整し、データ解析を繰り返すことで分散不良を克服した。これに予想外の時間を費やしてしまったため、当初予定からは約3ヶ月遅れている。 2021年度より、実際に原子核乳剤を必要とする最初の実験(DsTau実検)に原子核乾板の供給がスケジュール（2021年7月納品）されおり、大量生産に向けて連続製造に向け工程のポリッシュ、廃液処理方法を確立した。 また、次世代の飛跡読み取り装置(HTS2)で飛跡を読み取るために、原子核乳剤結晶サイズの最適化研究も始めた。より高速で飛跡を読み出すためにレンズ倍率が下がるため、飛跡を構成しているグレインが大きい方が検出効率向上を見込めるからである。現在までに数バッチを作った所で、結晶サイズを大きくすることには成功したがノイズ(Fog)が少し多いなどの課題もみつかった。この乳剤に関してもノイズ削減、長期特性の確認・改良開発を引き続き進める。
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S), Grant-in-Aid for Scientific Research (S), Kobe University, May 2017 - Mar. 2022Cosmic gamma-ray observation by balloon borne emulsion telescope to study unsolved issuesJAXAに採択されている2018年4月のオーストラリアアリススプリングスにおける海外気球実験の準備を行った。2015年5月に同じくオーストラリアにおいて実施した気球実験の経験をふまえ、中口径(3840cm^2)望遠鏡のさまざまな構成要素に対して改良を加え、2015年の観測で観測統計を半減することにつながってしまった観測器の一部に発生した不具合に対して再発防止策を施した上で、JAXAの環境試験槽等を利用して低圧・低温環境でも確実に動作することのテストを重ねた。それらの構成要素を組上げて望遠鏡システムとした上で、JAXAの大気球実験室グループと共同して望遠鏡システムとしての動作テストおよびJAXA機器との噛み合わせ試験を輸出前に行った。 海外サイトでの気球実験実施のために、数ヶ月前に資材を現地に輸出し、数週間前から研究分担者および研究協力者が現地に常駐して望遠鏡組み立てを行い、打上げ予定期日までに準備を完了させた。さらに観測器回収後にオーストラリア国内での現像作業を速やかに実施できるようにするために、現地での望遠鏡組み立て作業に先立って、シドニー大学内にエマルションフィルムの現像設備を立ち上げた。 2018年の中口径望遠鏡での気球観測により既知の高輝度ガンマ線単体Velaパルサーのイメージングによりエマルション望遠鏡の総合性能を実証した後に、2021年にJAXAが計画している海外気球実験において科学観測を開始するために大口径望遠鏡の軽量化をはじめとする開発を進めた。
- 日本学術振興会, 科学研究費補助金／基盤研究(A), 基盤研究(A), 神戸大学, Apr. 2017 - Mar. 2020, Principal investigator2018年4月に予定されているオーストラリア・アリススプリングスでの気球実験にむけて、観測器の改良および準備を進めた。 タイムスタンパーとなるエマルション多段シフターについては、低エネルギー粒子に対する電磁散乱による影響や飛跡を再構成する際の不定性を小さくするために、金属ステージの開口部を最大化する改造を施すとともに、実装するエマルションフィルムの真空パックに関しては剛性を高めるとともに段間ギャップを短くするために炭素繊維強化プラスチックの背板を実装する検討を行った。真空包装機を導入するとともに、炭素繊維強化プラスチックの板がエマルションフィルムに対して化学的悪影響を及ぼさないことを確認する加速テストを進めた。 与圧容器については、将来の大面積化への拡張性を持たせるために、前回気球実験では円形だったジュラルミン製の主構造体を、エマルション望遠鏡実装部となる直線部分を含むレーストラック形状にする設計変更を行い、それに伴い球形だった圧力保持薄膜の形状を繭型に設計変更し、主構造体および薄膜の強度計算や構成要素の強度テストを進めた。Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Nagoya University, 01 Apr. 2015 - 31 Mar. 2018Study of Neutrino by OPERA experiment -Summary and study on cosmic-ray event-OPERA is an experiment to confirm the existence of neutrino oscillation, i.e. existence of neutrino mass, by detecting tau neutrino appearance. From 2000, we started the detector and beam line construction, did beam exposure from 2006 to 2012, have been performing event analysis until today. In 2015, we detected the fifth event and reached to the statistical significance of 5.1σlevel meaning the discovery level. From 2016, by applying looser cut and including the boarder events, the signal number reaches to 10 events with the expected background of 2.0±0.4. The reached significance level is 6.1σ. OPERA has finished the main analysis by this paper although continuing technological R&D using real events for electron neutrino detection and so on for future neutrino experiments.
- 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), Nagoya University, 28 Jun. 2013 - 31 Mar. 2018R&D of super high resolution neutrino detectorIn this research, we increased the nuclear emulsion gel production capability up to 700kg/year and the emulsion film production capability up to 300m2/year. Using this capability, we supplied nuclear emulsion films to the following projects and accelerated each projects and fields, 1) NINJA experiment at JPARC for the study of low energy neutrino interactions, 2) GRAINE project for the balloon borne large aperture and high precision gamma-ray telescope, 3) Cosmic-ray muon radiography to investigate the inner structure of large scale subjects like Pyramids. In parallel, we realized the extension of the crystal size selection from 20nm to 1.2 microns. By this extension, we can select the crystal size suited to the purpose. Using super fine crystal gel of 10 nano-meter size, we developed the experiment for dark matter directional detection, heavy ion experiments and high precision neutron detection.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Kobe University, Apr. 2014 - Mar. 2017Development of time-resolved multi-stage shifterBased on the invention, a prototype of the roller-driven model was co-developed with Mitaka Kohki Co., Ltd. from August 2014. Currently, working and performance tests are ongoing and a required accuracy of within 1 micron is being obtained. ~Millisecond time resolution in a balloon-borne experiment, ~second time resolution for 126.7 days in an accelerator neutrino experiment and ~10 to the 6th power time-resolved numbers are being achieved.
- 科学研究費補助金／基盤研究(A), Apr. 2014 - 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 (A), Nagoya University, 01 Apr. 2012 - 31 Mar. 2016Neutrino research by OPERA detectorUntil today, four clear tau neutrino events have been detected. The existence of the neutrino oscillation, i.e. muon-neutrino to tau-neutrino, has been confirmed with the statistical significance of 4.2sigma. In one of the detected event, the decay daughter was identified as muon with minus charge. This means that the event is tau-neutrino event not the anti-tau-neutrino event. By this fact, it is confirmed with 98% probability that muon-neutrino oscillate to tau-neutrino (not anti-tau neutrino). The search of electron- neutrino has been tried and 19 events was identified with 21.3 expectation. This result gave an upper limit on the osicllation parameter theta13 and gave limitation on the oscillation parameter region of LNSD claimed oscillation.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Priority Areas, Nagoya University, 2006 - 2011Study of neutrino flavor by the detection of Tau neutrinoIn this study, we pushed forward the OPERA experiment which intends to give a final conclusion to the existence of Neutrino Oscillation by detecting Tau neutrino appearance. Nuclear emulsion is the only one detector which can detect Tau neutrinos. In OPERA, about 9.3 Million nuclear emulsion films with the size of 10cm times 12.5cm were used to construct a neutrino detector of which mass is 1250 ton in Gran Sasso underground laboratory, Italy. Pure Muon neutrino beam was produced and injected to the direction of OPERA detector by a newly constructed neutrino beam line at CERN which is about 730km distant from Gran Sasso. In 2008, the exposure was started and until 2011 about 13000 neutrino interactions were accumulated in the detector. In parallel to the exposure, the extraction and the analysis of the Nuclear Emulsion target were continued. In 2011, we succeeded to detect the first Tau neutrino interaction.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Kobe University, 2008 - 2010, Principal investigatorThe research and development have been done to realize emulsion gamma-ray telescope system for cosmic gamma-ray observation. After various tests to confirm its performance, the flight models are designed and constructed. We proposed a balloon-borne experiment using 1st flight model to JAXA. It has been approved by JAXA and the launching is scheduled in June 2011.Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 2007 - 2009Basic performances were measured for the newly developed large aperture Electron Bombardment CCD(EBCCD). Its gain shows good linearity as a function of applied high voltage up to -12kV, where the gain is 2400. The spatial resolution was 250μm, and the linearity between the input and output was very good and better than that of an Image Intensifier Tube(IIT) which is the same kind of photosensor as an EBCCD. Cosmic rays were detected by this EBCCD with a plastic scintillator, which shows a practical use of this EBCCD in particle physics experiments.Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), High Energy Accelerator Research Organization, 2005 - 2008Development of new generation photon detectors with an utmost sensitivity単一のフォトン(光子)の検出ができる超高感度の光センサー(電子打ち込み型のハイブリッド光センサー(HPD))について、その可能性を探るためさまざまなタイプのセンサーを試作しその性能を検証した。試作されたセンサーは、2次元多チャネルアレイ・シングルフォトン解析装置,大口径微弱光撮像システムそして超高速光センサーの三種類である
- 日本学術振興会, 科学研究費助成事業, 学術創成研究費, 名古屋大学, 2000 - 2004素粒子標準理論の検証に関する日欧国際共同研究日欧国際共同で推進しているOPERA計画は、ニュートリノ振動の存在をappearanceの方法で検証する長基線νμ→ντニュートリノ振動実験をその中核とし、2006年の6月のニュートリノ照射の本審開始を目指して建設を推進している。CERN研究所で作るミューニュートリノをイタリアのGransasso研究所に向けて撃ち込み、ミューニュートリノから転化したタウニュートリノを捉える。 OPERA検出器は心臓部に原子核乾板「OPERA-film」と鉛板を積層するECCブリック1700トン、ニュートリノ反応の起きたECCブリックを識別する「識別カウンター」からなる。日本側(実質名古屋大学)は名古屋大学が富士写真フィルム社と共同開発した原子核乾板「リフレッシュ可能OPERA-film」の全量を分担している。このOPERA-filmは製造工程で蓄積する宇宙線飛跡を温度30℃、湿度95%に3日間さらすことで消去できる性能をもつ。リフレッシュ設備を岐阜県瑞浪市の地下90mに完成させた。2005年3月時点で「OPERA-film」の製造は970万枚(全使用量の50%)まで進み、そのうちの300万枚のリフレッシュを完了してイタリアのGransasso実験場に送り、リフレッシュ装置の処理能力は十分である。しかし「OPERA film」の残量50%の生産はお金の見通しがなく2006年6月までに完了できない。ヨーロッパ側が分担しているGransassoのOPERA検出器の土木工事、μ粒子用マグネット、ECCブリック1700トンを支える橋脚は完了し、SFTで読み出す「識別カウンター」の搬入も始まり、現像設備の建設も順調である。CERN研究所のニュートリノビームラインの構築は既にほぼ完了した。 2006年6月からは毎日50-60事象のニュートリノ反応がECCの中で起きるであろう。ニュートリノ反応の解析を行うS-UTS(自動飛跡読み取り装置:UTSの飛跡読み取り速度の50倍)の開発が完了して、2005年1月29日に第1号機の完成が中日新聞、毎日新聞で報道された。 2005年度1年間、CERNの加速器は運転が中断されるために、各種のテスト実験が不可能であり、2005年9-10月に米国FNALのニュートリノビームを使ってOPERAの解析のリハーサルを予定している。 *お金不足は中間評価で指摘されていた。国際的な問題とならないうちの解決を目指し努力中である。*
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Nagoya University, 2001 - 2003Research and development of a super high sensitive nuclear emulsion gelA research and development was performed on the nuclear emulsion gel, which has a long history and no new R&D trial was performed for a long period. With the help of Fuji film co., we applied' the newest technologies, i.e. controlled double jet production of AgBr and core-shell structure of the micro crystal, which were currently used in the photographic emulsion production, to the production of the nuclear emulsion gel. The developed nuclear emulsion gel can record 65 grains per 100 microns long trajectory of a minimum ionizing particle. The achieved sensitivity is about 1.8 times higher than Fuji ET7B used for a long time until today and about 1.4 times higher than the gel used in DONUT experiment. Also, we tried to create a fine resolution gel of 0.05 micron diameter. Though it has almost no sensitivity to a minimum ionizing particle, we can investigate the possibility of position resolution of nuclear emulsion by using electron-microscopes. The developed grains are normally larger than the original size of the micro crystal, because of a rapid growth of a filament like structure (diameter about 25 nm) from the grains. Further R&D is needed to suppress the filament growth and keep the position resolution as fine as the original size.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A)., Nagoya University, 1999 - 2000Research for the neutrino oscillation using the nuclear EmulsionThe purpose of this research is to study the mass of neutrinos by using the neutrino oscillation ν_μ→ν_τ. 1) We succeeded to get more than 150,000 neutrino interactions in the CHORUS emulsion film. These neutrino interactions were analyzed search for tau lepton emitted from the neutrino interactions by the microscope and following results were obtained (1) Upper limit of ν_μ→ν_τ : sin^2 (θμτ)=0.0004 under the condition of m^2>100 eV^2. (2) We developed Super high speed system for read out tracks in photographic films. (3) More than 1000 charm particles were obtained. 2) In DONUT experiment which was done at FNAL, We developed NET-SCAN analysis method for the emulsion film. We succeeded to identify 6 tau neutrino interactions in emulsion films.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Developmental Scientific Research (B), Kobe University, 1994 - 1995Development of Teaching System for Fundamental Course in Physics Laboratory under Consistent Four-years EducationThe items studied in this research are given below together with [the results obtained]. 1) investigation on the existing state of the fundamental cource in Physics Laboratory and relevant matters. [We collected the textbooks and inspected the laboratories for more than ten universities. And a questionaire was carried out in kobe university, and a few thouthands of answers from the studens and teachers working in natural science were anlyzed.] 2) establishment of network for the Fundamental Course in Physics Laboratory. [The hardware and fundamental software were prepared and provided for test use.] Arrangement of textbooks and space available for students, which helps them to learn by hemselves at any time. [Most of available textbooks on fundamental physics experiment were bought and arranged for the used by teachers and students.] 4) investigation of the educational efficiency of the present cource and design of new themes of experiment. [A questionaires was carried out every terms for the students took the Fundamental Course in Physics Laboratory and the results were analyzed.] 5) Introduction of a new theme using computers. [Computers were used for data analysis in the classes and it had good results.] 6) publication of progress report on this reseach project. [Several talks and papers were given on the progress of this research project.] 7) Test of wellknown histrical experiments and their educatinal effects. [Milikan's experiment were in preparation for studens.] 8) Investigation of interest and understanding of each student and its application for efficient teaching methods. [We tried several ideas. One of them is chaning parther every class.] 9) To finish the research by publishing the results. [It is to be finished soon.]
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for international Scientific Research, Nagoya University, 1993 - 1995The measurement of a tau-neutorino massCHORUS is the international project using the neutrino beam from super proton synchrotrn (SPS) of CERN (Center of Europ organization for Research of Nuclus). The object of this project is to observe the mass of tau-neutrino by the method of the oscillation from mu-neutrino to tau-neutrino. The identification of tau-neutrino could be done by detecting the produced tau by observing the trace of tau from produced point to the decay point in the photographic nucler emulsion. The detecter have many parts, target spectrometer calorimeter and muon spectrometer. We are contributing on the target the most important target of this experiment. This target has the sandwich structure of emulsion sheets and fiber trackers. The neutrino exposure has been finished on Novenber in 1995. The emulsion analysis, the most difficult job in this project, has been done by using Automatic emulsion analysis system originally developed by physists of Nagoya university. The number of analyzed neutrino interaction in the emulsion is more than 7700 neutorino interactions by 4 month scanning. This number is about 15% of all CHORUS, but already this number is 2 times higher than the most sensitive similler experiment, named E531 done in 1978. This experiment is sensitive to 1 eV in tauneutrino mass and 1% in mixing tau-neutrino to mu-neutrino. To finish all of the analysis, it take more two years.
- 日本学術振興会, 科学研究費助成事業, 奨励研究(特別研究員), 名古屋大学, 1989 - 1990全自動飛跡解析システムを用いる新素粒子の実験的研究