Curriculum Vitaes
Profile Information
- Affiliation
- Aerospace Project Research Associate, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Degree
- PhD(Mar, 2022, Kobe University)Master(Mar, 2019, Osaka University)Bachelor(Mar, 2017, Kobe University)
- ORCID ID
https://orcid.org/0000-0002-3723-7250- J-GLOBAL ID
- 201901000915830639
- researchmap Member ID
- B000367539
Major Research Interests
2Research History
2-
Apr, 2019 - Mar, 2022
Education
3-
Apr, 2019 - Mar, 2022
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Apr, 2017 - Mar, 2019
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Apr, 2013 - Mar, 2017
Committee Memberships
1-
Apr, 2019 - Mar, 2021
Awards
1Papers
28-
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1069 169982-169982, Dec, 2024 Peer-reviewed
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Progress of Theoretical and Experimental Physics, 2024(3), Feb 15, 2024 Peer-reviewedAbstract Uncovering neutrinoless double beta decay (0ν2β) is crucial for confirming neutrinos’ Majorana characteristics. The decay rate of 0νββ is theoretically uncertain, influenced by nuclear matrix elements that vary across nuclides. To reduce this uncertainty, precise measurement of the half-life of neutrino-emitting double beta decay (2ν2β) in different nuclides is essential. We have launched the PIKACHU (Pure Inorganic scintillator experiment in KAmioka for CHallenging Underground sciences) project to fabricate high-purity Ce-doped Gd3Ga3Al2O12 (GAGG) single crystals and use them to study the double beta decay of 160Gd. Predictions from two theoretical models on nuclear matrix element calculations for 2ν2β in 160Gd show a significant discrepancy in estimated half-lives, differing by approximately an order of magnitude. If the lower half-life estimation holds true, detecting 2ν2β in 160Gd could be achievable with a sensitivity enhancement slightly more than an order of magnitude compared to prior investigations using Ce-doped Gd2SiO5 (GSO) crystal. We have successfully developed GAGG crystals with purity levels surpassing previous standards through refined purification and selection of raw materials. Our experiments with these crystals indicate the feasibility of reaching sensitivities exceeding those of earlier studies. This paper discusses the ongoing development and scintillator performance evaluation of high-purity GAGG crystals, along with the anticipated future prospects of the PIKACHU experiment.
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Physical Review Letters, 131(4), Jul 28, 2023 Peer-reviewed
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Physical Review D, 108(1), Jul 26, 2023 Peer-reviewed
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Journal of Instrumentation, 18(07) P07054-P07054, Jul 1, 2023 Peer-reviewedAbstract The XENONnT detector uses the latest and largest liquid xenon-based time projection chamber (TPC) operated by the XENON Collaboration, aimed at detecting Weakly Interacting Massive Particles and conducting other rare event searches.The XENONnT data acquisition (DAQ) system constitutes an upgraded and expanded version of the XENON1T DAQ system.For its operation, it relies predominantly on commercially available hardware accompanied by open-source and custom-developed software.The three constituent subsystems of the XENONnT detector, the TPC (main detector), muon veto, and the newly introduced neutron veto, are integrated into a single DAQ, and can be operated both independently and as a unified system.In total, the DAQ digitizes the signals of 698 photomultiplier tubes (PMTs), of which 253 from the top PMT array of the TPC are digitized twice, at ×10 and ×0.5 gain.The DAQ for the most part is a triggerless system, reading out and storing every signal that exceeds the digitization thresholds.Custom-developed software is used to process the acquired data, making it available within ∼30 s for live data quality monitoring and online analyses.The entire system with all the three subsystems was successfully commissioned and has been operating continuously, comfortably withstanding readout rates that exceed ∼500 MB/s during calibration.Livetime during normal operation exceeds 99% and is ∼90% during most high-rate calibrations.The combined DAQ system has collected more than 2 PB of both calibration and science data during the commissioning of XENONnT and the first science run.
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Physical Review Letters, 130(26), Jun 30, 2023 Peer-reviewed
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The European Physical Journal C, 83(6), Jun 27, 2023 Peer-reviewedAbstract A low-energy electronic recoil calibration of XENON1T, a dual-phase xenon time projection chamber, with an internal $${}^{37}$$Ar source was performed. This calibration source features a 35-day half-life and provides two mono-energetic lines at 2.82 keV and 0.27 keV. The photon yield and electron yield at 2.82 keV are measured to be ($$32.3\,\pm \,0.3$$) photons/keV and ($$40.6\,\pm \,0.5$$) electrons/keV, respectively, in agreement with other measurements and with NEST predictions. The electron yield at 0.27 keV is also measured and it is ($$68.0^{+6.3}_{-3.7}$$) electrons/keV. The $${}^{37}$$Ar calibration confirms that the detector is well-understood in the energy region close to the detection threshold, with the 2.82 keV line reconstructed at ($$2.83\,\pm \,0.02$$) keV, which further validates the model used to interpret the low-energy electronic recoil excess previously reported by XENON1T. The ability to efficiently remove argon with cryogenic distillation after the calibration proves that $${}^{37}$$Ar can be considered as a regular calibration source for multi-tonne xenon detectors.
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Journal of Physics G: Nuclear and Particle Physics, 50(1) 013001-013001, Jan 1, 2023 Peer-reviewedAbstract The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon time-projection chamber is the leading technology to cover the available parameter space for weakly interacting massive particles, while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinoless double-beta decay and through a variety of astrophysical sources. A next-generation xenon-based detector will therefore be a true multi-purpose observatory to significantly advance particle physics, nuclear physics, astrophysics, solar physics, and cosmology. This review article presents the science cases for such a detector.
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The European Physical Journal C, 82(11), Nov 3, 2022 Peer-reviewedAbstract The XENON collaboration has published stringent limits on specific dark matter – nucleon recoil spectra from dark matter recoiling on the liquid xenon detector target. In this paper, we present an approximate likelihood for the XENON1T 1 t-year nuclear recoil search applicable to any nuclear recoil spectrum. Alongside this paper, we publish data and code to compute upper limits using the method we present. The approximate likelihood is constructed in bins of reconstructed energy, profiled along the signal expectation in each bin. This approach can be used to compute an approximate likelihood and therefore most statistical results for any nuclear recoil spectrum. Computing approximate results with this method is approximately three orders of magnitude faster than the likelihood used in the original publications of XENON1T, where limits were set for specific families of recoil spectra. Using this same method, we include toy Monte Carlo simulation-derived binwise likelihoods for the upcoming XENONnT experiment that can similarly be used to assess the sensitivity to arbitrary nuclear recoil signatures in its eventual 20 t-year exposure.
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Physical Review Letters, 129(16), Oct 13, 2022 Peer-reviewed
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1045 167626-167626, Oct, 2022 Peer-reviewed
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Physical Review C, 106(2), Aug 26, 2022 Peer-reviewed
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The European Physical Journal C, 82(7), Jul 8, 2022 Peer-reviewedAbstract The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and $$^{222}$$Rn emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background ($$\sim $$17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected $$^{222}$$Rn activity concentration in XENONnT is determined to be 4.2 ($$^{+0.5}_{-0.7}$$) $$\upmu $$Bq/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system.
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Physical Review D, 106(2), Jul 5, 2022 Peer-reviewed
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Progress of Theoretical and Experimental Physics, Apr 29, 2022 Peer-reviewedAbstract A novel online distillation technique was developed for the XENON1T dark matter experiment to reduce intrinsic background components more volatile than xenon, such as krypton or argon, while the detector was operating. The method is based on a continuous purification of the gaseous volume of the detector system using the XENON1T cryogenic distillation column. A krypton-in-xenon concentration of (360±60)ppq was achieved. It is the lowest concentration measured in the fiducial volume of an operating dark matter detector to date. A model was developed and fit to the data to describe the krypton evolution in the liquid and gas volumes of the detector system for several operation modes over the time span of 550 days, including the commissioning and science runs of XENON1T. The online distillation was also successfully applied to remove 37Ar after its injection for a low energy calibration in XENON1T. This makes the usage of 37Ar as a regular calibration source possible in the future. The online distillation can be applied to next-generation LXe TPC experiments to remove krypton prior to, or during, any science run. The model developed here allows further optimization of the distillation strategy for future large scale detectors.
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Journal of Instrumentation, 16(12) P12033-P12033, Dec 1, 2021 Peer-reviewedLead authorCorresponding authorAbstract Scintillation detector is widely used for the particle detection in the field of particle physics. Particle detectors containing fluorine-19 (19F) are known to have advantages for Weakly Interacting Massive Particles (WIMPs) dark matter search, especially for spin-dependent interactions with WIMPs due to its spin structure. In this study, the scintillation properties of carbontetrafluoride (CF4) gas at low temperature were evaluated because its temperature dependence of light yield has not been measured. We evaluated the light yield by cooling the gas from room temperature (300 K) to 263 K. As a result, the light yield of CF4 was found to increase by (41.0 ± 4.0stat. ± 6.6syst.)% and the energy resolution was also found to improve at low temperature.
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Physical Review D, 103(9), May 26, 2021 Peer-reviewed
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Physical Review D, 103(6), Mar 19, 2021 Peer-reviewed
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 986 164727-164727, Jan, 2021 Peer-reviewed
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Journal of Physics: Conference Series, 1643(1), Dec 23, 2020 Peer-reviewed
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Journal of Cosmology and Astroparticle Physics, 2020(11) 031-031, Nov 16, 2020 Peer-reviewed
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Journal of Physics: Conference Series, 1468(1), Mar 20, 2020 Peer-reviewed
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Journal of Physics: Conference Series, 1468, 2020 Peer-reviewedLead authorLast authorCorresponding author
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Radiation detectors and their uses : proceedings of the 33rd Workshop on Radiation Detectors and Their Uses, 42-50, Dec, 2019 Peer-reviewed
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Journal of Instrumentation, 14(06) P06037-P06037, Jun 28, 2019 Peer-reviewedLead authorCorresponding author
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Meeting Abstracts of the Physical Society of Japan, 74.2 274-274, 2019
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Progress of Theoretical and Experimental Physics, 2018(12), Dec 1, 2018 Peer-reviewedLead authorCorresponding author
Misc.
7-
日本物理学会講演概要集(CD-ROM), 78(1), 2023
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応用物理学会秋季学術講演会講演予稿集(CD-ROM), 82nd, 2021
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応用物理学会秋季学術講演会講演予稿集(CD-ROM), 82nd, 2021
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16TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2019), 1468, Nov 3, 2019
Major Presentations
31-
JPS spring meeting 2019, Mar 16, 2019
Teaching Experience
6-
Oct, 2024 - Oct, 2024Advanced Sustainable Engineering (Tokyo University of Technology)
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Apr, 2024 - Jun, 2024ROOT講習会 (宇宙素粒子若手の会)
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Apr, 2023 - Jun, 2023ROOT講習会 (宇宙素粒子若手の会 (YMAP))
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Apr, 2022 - Jun, 2022ROOT lecture (YMAP)
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Apr, 2021 - Jun, 2021ROOT 講習会 (宇宙素粒子若手の会)
Professional Memberships
1Research Projects
2-
科学研究費助成事業, 日本学術振興会, Apr, 2024 - Mar, 2026
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Aug, 2022 - Mar, 2024
