PUBLICATIONS and FUNDINGS

PUBLICATIONS

2024

• Search for Charged Excited States of Dark Matter with KamLAND-Zen
  S. Abe, M. Eizuka, S.Futagi, et al. (KamLAND-Zen Collaboration)
  (Accepted for publication in PLB, 2024 Jun 27th)
  arXiv:2311.09676

2023

• High-pressure xenon gas time projection chamber with scalable design and its performance at around the Q value of 136Xe double-beta decay
  Masashi Yoshida, Kazuhiro Nakamura, Shinichi Akiyama, et al. (AXEL Collaboration)
  (Accepted for publication in  PTEP, 2023 Dec 1st)
  Published on 2023 December  5th
  arXiv:2310.19714
  DOI:10.1093/ptep/ptad146
  Progress of Theoretical and Experimental Physics, vol.2024, Issue1, p.013H01 (2024)

• Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND
  S. Abe, S. Asami, M. Eizuka, et al. (KamLAND Collaboration)
  (Accepted for publication in  PRC, 2023 April 5th)
  Published on 2023 May 22nd
  arXiv:2301.09307
  DOI:10.1103/PhysRevC.107.054612
  Physical Review C, vol.107, issue.5, p.054612 (2023)

• First measurement of the strange axial coupling constant using neutral-current quasi-elastic interactions of atmospheric neutrinos at KamLAND
  S. Abe, S. Asami, M. Eizuka, et al. (KamLAND Collaboration)
  (Accepted for publication in  PRD, 2023 March 7th)
  Published on  2023 April 19th
  arXiv:2211.13911
  DOI:10.1103/PhysRevD.107.072006
  Physical Review D, vol.107, issue.7, p.072006 (2023) 

• Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen
  S. Abe, S. Asami, M. Eizuka, et al. (KamLAND-Zen Collaboration)
  Published on 2023 January
  arXiv:2203.02139
  DOI:10.1103/PhysRevLett.130.051801
  Physical Review Letters, vol.130, issue.5, p.051801 (2023) 

2022

• A study of self-vetoing balloon vessel for liquid-scintillator detectors
  S. Obara, Y.Gando, S. Ieki, et al. (KamLAND-Zen Collaboration)
  (Proceedings of the International Conference on Technology and Instrumentation in Particle Physics (TIPP 2021))
  Published on 2022 November
  DOI:10.1088/1742-6596/2374/1/012111
  Journal of Phys.: Conf. Series, vol.2374, p.012111 (2022)

• Abundances of uranium and thorium elements in Earth estimated by geoneutrino spectroscopy
  S. Abe, S. Asami, M. Eizuka, et al. (KamLAND Collaboration)
  Accepted for publication in Geophysical Research Letters, 2022 August 5th
  Published on 2022 August 11th
  arXiv:2205.14934
  DOI:10.1029/2022GL099566
  Geophysical Research Letters, vol.49, num,16, p.e2022GL099566 (2022)

• KamLAND's search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube
  S. Abe, S. Asami, M. Eizuka, et al. (KamLAND Collaboration)
  Accepted for publication in Astroparticle Physics, Available online 2022 July 11th
  Available online 2022 July 21st
  arXiv:2202.07345
  DOI:10.1016/j.astropartphys.2022.102758
  Astroparticle Physics, vol.143, p.102758 (2022)

• Search for supernova neutrinos and constraint on the galactic star formation rate with the KamLAND data
  S. Abe, S. Asami, M. Eizuka, et al. (KamLAND Collaboration)
  Published on 2022 July 28th
  arXiv:2204.12065
  DOI:10.3847/1538-4357/ac7a3f
  The Astrophysical Journal, vol.934, num.1, p.85 (2022)

• A search for correlated low-energy electron antineutrinos in KamLAND with gamma-ray bursts
  S. Abe, S. Asami, A. Gando, et al. (KamLAND Collaboration)
  Published on 2022 March 7
  arXiv:2112.04918
  DOI:10.3847/1538-4357/ac4e7e
  The Astrophysical Journal, vol.927, num.1, p.69 (2022)

• Limits on astrophysical antineutrinos with the KamLAND experiment
  S. Abe, S. Asami, A. Gando, et al. (KamLAND Collaboration)
  Published on 2022 January 20
  arXiv:2108.08527
  DOI:10.3847/1538-4357/ac32c1
  The Astrophysical Journal, vol.925, num.1, p.14 (2022) 

• Search for Solar Flare Neutrinos with the KamLAND detector
  S. Abe, S. Asami, A. Gando, et al. (KamLAND Collaboration)
  Published on 2022 January 17
  arXiv:2105.02458
  DOI:10.3847/1538-4357/ac35d1
  The Astrophysical Journal, vol.924, num.2, p.103 (2022)

2021

• A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector
  S. Abe, S. Asami, A. Gando, et al. (KamLAND-Zen Collaboration)
  (Preprint)
  arXiv:2101.06049 

• Search for Supernova Relic Neutrinos at KamLAND
  S.Obara, S.Ieki, K.Ishidoshiro, et al. (KamLAND collaboration)
  (Proceedings on the 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP2021))
  DOI:10.1088/1742-6596/2156/1/012138
  Journal of Phys.: Conf. Series, vol.2156, p.012138 (2021)

• Supernova Neutrino Burst Search at KamLAND
  M.Eizuka, K.Ishidoshiro, S.Obara, et al. (KamLAND collaboration)
  (Proceedings on the 17th International Conference on Topics in Astroparticle and Underground Physics (TAUP2021))
  DOI:10.1088/1742-6596/2156/1/012195
  Journal of Phys.: Conf. Series, vol.2156, p.012195 (2021)

• The nylon balloon for xenon loaded liquid scintillator in KamLAND-Zen 800 neutrinoless double-beta decay search experiment
  Y. Gando, A. Gando, T. Hachiya, et al. (KamLAND-Zen Collaboration)
  Published on 2021 August 9
  arXiv:2104.10452
  DOI:10.1088/1748-0221/16/08/P08023
  Journal of Instrumentation, vol.16, num.8, p.08023 (2021)

• Low-energy astrophysics with KamLAND
  N.Kawada, S.Obara, K.Ishidoshiro, et al. (KamLAND collaboration)
  (Proceedings on the 37th International Cosmic Ray Conference (ICRC2021))
  DOI:10.22323/1.395.1163
  Proceedings of Science, vol.ICRC2021, p.1163 (2021) 

• Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events
  S. Abe, S. Asami, A. Gando, et al. (KamLAND Collaboration)
  Published on 2021 March 10
  arXiv:2012.12053
  DOI:10.3847/1538-4357/abd5bc
  The Astrophysical Journal, vol.909, num.2, p.116 (2021)

2020

• Front-end electronics for the SiPM-readout gaseous TPC for neutrinoless double beta decay search
  K.Z.Nakamura, et al. (AXEL Collaboration)
  arXiv:2001.02104
  DOI:10.1109/TNS.2020.2988716
  IEEE Transactions on Nuclear Science (2020) 

• AXEL: High-pressure Xe gas TPC for BG-free 0n2b decay search
  S.Obara, et al. (AXEL Collaboration)
  (Proceedings on the 15th Vienna Conference on Instrumentation (VCI2019))
  arXiv:1909.09343
  DOI:10.1016/j.nima.2019.162803
  Nuclear Instruments and Methods in Physics Research Section A, vol.958, p.162803 (2020) 

• Design and performance of a high-pressure xenon gas TPC as a prototype for a large-scale neutrinoless double-beta decay search
  S.Ban, et al. (AXEL Collaboration)
  arXiv:2001.03281
  DOI:10.1093/ptep/ptaa030
  Progress of Theoretical and Experimental Physics, vol.2020, Issue3, p.033H01 (2020)

• Inner balloon production for KamLAND-Zen 800
  A.Gando, Y.Gando, T.Hachiya, S.Hayashida, K.Hosokawa, H.Ikeda, S.Obara, H.Ozaki, K.Ueshima, H.Watanabe, and for KamLAND-Zen Collaboration
  (Proceedings on the 16th International Conference on Topics in Astroparticle and Underground Physics (TAUP2019))
  DOI:10.1088/1742-6596/1468/1/012145
  Journal of Phys.: Conf. Series, vol.1468, p.012145 (2020) 

• Scintillation balloon for liquid scintillator base Neutrinoless double beta decay search experiments
  S.Obara, Y.Gando, and K.Ishidoshiro
  (Proceedings on the 16th International Conference on Topics in Astroparticle and Underground Physics (TAUP2019))
  arXiv:1912.08067
  DOI:10.1088/1742-6596/1468/1/012136
  Journal of Phys.: Conf. Series, vol.1468, p.012136 (2020)

2019

• Scintillation balloon for neutrinoless double-beta decay search with liquid scintillator detectors
  S.Obara, Y.Gando, and K.Ishidoshiro
  arXiv:1903.10736
  DOI:10.1093/ptep/ptz064
  Progress of Theoretical and Experimental Physics, vol.2019, Issue7, p.073H01 (2019) 

• Precision Analysis of the 136Xe Two-Neutrino BetaBeta Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements
  A.Gando et al. (KamLAND-Zen Collaboration)
  arXiv:1901.03871
  DOI:10.1103/PhysRevLett.122.192501
  Physical Review Letters, vol.122, issue19, p.192501 (2019)

2018

• A Search for Supernova Relic Neutrinos with KamLAND during Reactor-Off Period
  Shuhei Obara
  (Doctor dissertation, Tohoku Univ.)
  Link to KamLAND thesis page

2017

• Status of balloon production for KamLAND-Zen 800 kg phase
  S.Obara for the KamLAND-Zen Collaboration
  (Proceedings for The 14th Vienna Conference on Instrumentation (VCI2016))
  DOI: 10.1016/j.nima.2016.06.059
  Nuclear Instruments and Methods in Physics Research Section A, vol.845, p.410-413 (2017)

2016

• Search for electron antineutrinos associated with gravitational wave events GW150914 and GW151226 using KamLAND
  A.Gando et al. (KamLAND Collaboration)
  arXiv:1606.07155
  DOI:10.3847/2041-8205/829/2/L34
  The Astrophysical Journal Letters, vol.829, num.2, p.L34 (2016)
  (Erratum)
  DOI:10.3847/2041-8213/aa9a32
  The Astrophysical Journal Letters, vol.851, num.1, p.L22 (2017)

• Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen
  A.Gando et al.  (KamLAND-Zen Collaboration)
  arXiv:1605.02889
  DOI:10.1103/PhysRevLett.117.082503
  Physical Review Letters, vol.117, issue8, p.082503 (2016)
  (Erratum)
  DOI:10.1103/PhysRevLett.117.109903
  Physical Review Letters vol.117, issue10, p.109903 (2016)

• Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
  K.Asakura et al. (KamLAND-Zen Collaboration)
  arXiv:1509.03724
  DOI:10.1016/j.nuclphysa.2015.11.011
  Nuclear Physics A, vol.946, p.171-181 (2016)

• KamLAND Sensitivity to Neutrinos from Pre-Supernova Stars
  K.Asakura et al. (KamLAND Collaboration)
  arXiv:1506.01175
  DOI:10.3847/0004-637X/818/1/91
  The Astrophysical Journal, vol.818, num.1, p.91 (2016)

2015

• Search for the Proton Decay Mode p -> v– K+ with KamLAND
  K.Asakura et al. (KamLAND Collaboration)
  arXiv:1505.03612
  DOI:10.1103/PhysRevD.92.052006
  Physical Review D,  vol.92, issue5, p.052006 (2015)

• Study of electron anti-neutrinos associated with gamma-ray bursts using KamLAND
  K.Asakura et al. (KamLAND Collaboration)
  arXiv:1503.02137
  DOI:10.1088/0004-637X/806/1/87
  The Astrophysical Journal, vol.806, num.1, p.87 (2015)

FUNDINGS

(研究代表者分のみ記載)

• 反電子ニュートリノ精密観測のための13C(a,n)16O反応断面積測定
  日本学術振興会  新学術領域研究(研究領域提案型)
  21H00061
  (2021.04.01 -- 2023.03.31)

• ガス飛跡検出器で探るマヨラナ・ディラック決着への道
  日本学術振興会  新学術領域研究(研究領域提案型)
  20H05251
  (2020.04.01 -- 2022.03.31)

• 徹底した放射性背景事象除去による最高感度マヨラナニュートリノ探索への挑戦
  山田科学振興財団 自然科学研究助成
  (2020.08.01 -- 2022.03.31)

• キセノンガス検出器を用いた余剰次元を伝搬するアクシオン探索
  日本学術振興会 若手研究
  19K14738
  (2019.04.01 -- 2023.03.31)

• 超新星背景ニュートリノ探索のためのカムランドでのT2Kビーム事象観測と基礎研究
  日本学術振興会  新学術領域研究(研究領域提案型)
  19H05102
  (2019.04.01 -- 2021.03.31)

• 背景事象フリーな次世代型ＴＰＣ検出器によるマヨラナニュートリノ探索
  日本学術振興会 特別研究員奨励費 PD
  18J00365
  (2018.04.01 -- 2020.01.31)

• シンチレーションバルーンを用いた世界最高感度でのマヨナラニュートリノ探索
  日本学術振興会  特別研究員奨励費 DC1
  15J02193
  (2015.04.24 -- 2018.03.31)