Study of 48Ca Double beta decay

• Project/Area Number: 17104003
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University
• Principal Investigator: KISHIMOTO Tadafumi Osaka University, 大学院・理学研究科, 教授 (90134808)
• Co-Investigator(Kenkyū-buntansha): OGAWA Izumi 大阪大学, 大学院・理学研究科, 助教 (20294142) ; AJIMURA Syuuhei 大阪大学, 核物理研究センター, 准教授 (10273575)
• Project Period (FY): 2005 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥101,530,000 (Direct Cost: ¥78,100,000、Indirect Cost: ¥23,430,000); Fiscal Year 2008: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000); Fiscal Year 2007: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000); Fiscal Year 2006: ¥30,420,000 (Direct Cost: ¥23,400,000、Indirect Cost: ¥7,020,000); Fiscal Year 2005: ¥46,150,000 (Direct Cost: ¥35,500,000、Indirect Cost: ¥10,650,000)
• Keywords: ニュートリノ / 二重ベータ崩壊 / マヨナラ質量 / 粒子数非保存 / 極低バックグラウンド / シンチレーション光 / 地下実験室 / 同位体濃縮 / マヨラナ質量 / 極低バックグランド / 2重ベータ崩壊 / シンチレーター

Research Abstract

ニュートリノのマヨラナ性を検証すべく、^<48>Caのニュートリノ放出を伴わない二重ベータ崩壊を探索する装置、CANDLES III(U.G.)の建設を神岡地下実験施設にて行った。大阪大学(地上)に建設したプロトタイプ装置を用いて性能評価を行い、特にバックグラウンドの低減・エネルギー分解能の向上に関して、要求される性能が得られることを示した。また、将来のさらなる感度向上につながる^<48>Caの低コストの同位体濃縮研究にも着手し、わずかではあるが、実験室レベルでの濃縮に成功した。

Research Products

• [Journal Article] Neutrino-less double-βdecay of 48Ca studied by CaF2(Eu) Scintillators (2008)
  • Author(s): S.Umehara, T.Kishimoto, I.Ogawa, et al.
  • Journal Title: PHYSICAL REVIEW C 78
  • Peer Reviewed
• [Journal Article] Gammma-ray spectroscopy of 16ΛO and 15ΛN hypernuclei via the 16O(K-, π-γ) reaction (2008)
  • Author(s): M.Ukai, S.Ajimura, T.Kishimoto
  • Journal Title: HYSICAL REVIEW C 77
  • Peer Reviewed
• [Journal Article] Study of 48Ca double beta decay with CANDLES (2008)
  • Author(s): I.Ogawa
  • Journal Title: Nuclear Physics A (Proc. International Nuclear Physics Conference) 805 Pages: 24-26
  • Peer Reviewed
• [Journal Article] Study of 48Ca double beta decay with CANDLES (2008)
  • Author(s): Y.Hirano, ;T.Kishimoto, I.Ogawa, et al
  • Journal Title: Journal of Physics: Conference Series 120 Pages: 52053-52053
  • Peer Reviewed
• [Journal Article] Study of the design for the CANDLES trigger system (2008)
  • Author(s): G.Ito, T.Kishimoto, I.Ogawa, Et al.
  • Journal Title: Journal of Physics: Conference Series 120 Pages: 52061-52061
  • Peer Reviewed
• [Journal Article] Ultra-violet wavelength shift for undoped CaF2 scintillation detector by two phase of liquid scintillator system in CANDLES (2008)
  • Author(s): S.Yoshida, T.Kishimoto, I.Ogawa, et al.
  • Journal Title: Nuclear Instruments and Methods in Physics Research 601 Pages: 282-293
  • Peer Reviewed
• [Journal Article] Study of ^<48>Ca double beta decay with CANDLES (2008)
  • Author(s): I. Ogawa, et al
  • Journal Title: J. Phys. Conf. Ser. (Proceedings of INPC2007) 136 Pages: 42053-42053
• [Journal Article] Double beta decay of ^<48>Ca studied by CaF_2(Eu) scintillators (2008)
  • Author(s): S. Umehara, et al
  • Journal Title: J. Phys. Conf. Ser. (Proceedings of TAUP2007) 120 Pages: 52058-52058
• [Journal Article] Study of Double Beta Decay of ^<48>Ca with CANDLES (2008)
  • Author(s): Y. Hirano
  • Journal Title: J. Phys. Conf. Ser. (Proceedings of TAUP2007) 120 Pages: 52053-52053
• [Journal Article] Study of Design for CANDLES Trigger System (2008)
  • Author(s): G. Ito
  • Journal Title: J. Phys. Conf. Ser. (Proceedings of TAUP2007) 120 Pages: 52061-52061
• [Journal Article] Study of light guide system for CANDLES (2008)
  • Author(s): Y. Tsubota
  • Journal Title: J. Phys. Conf. Ser. (Proceedings of TAUP2007) 120 Pages: 52060-52060
• [Journal Article] 2重ベータ崩壊とCANDLES実験 (2007)
  • Author(s): 岸本忠史・小川泉・梅原さおり・平野祥之
  • Journal Title: 原子核研究 51 Pages: 36-48
  • Peer Reviewed
• [Journal Article] Search for the H-dibaryon resonance in C-12 (K-, K+ ΛΛ X). (2007)
  • Author(s): C. J. Yoon, et. al.,
  • Journal Title: Physical Review C 75 Pages: 22201-22201
• [Journal Article] CANDLES for double beta decay of 48Ca (2006)
  • Author(s): S.Umehara, T.Kishimoto, I.Ogawa, et al.
  • Journal Title: Journal of Physics: Conference Series 39 Pages: 356-356
  • Peer Reviewed
• [Journal Article] Cascade Gamma Decay in the 7ΛLi Hypernucleus (2006)
  • Author(s): M.Ukai, S.Ajimura, T.Kishimoto
  • Journal Title: Physical Review C 73
  • Peer Reviewed
• [Journal Article] Search for the H-dibaryon resonance in C-12 (K-, K+ΛΛX) (2006)
  • Author(s): C.J.Yoon, T.Kishimoto
  • Journal Title: Physical Review C 75 Pages: 22201-22201
  • Peer Reviewed
• [Journal Article] CANDLES project for double beta decay of 48Ca (2006)
  • Author(s): S.Yoshida、T.Kishimoto, I.Ogawa
  • Journal Title: Nuclear Physics B(Proc. Suppl. ) 138 Pages: 214-214
  • Peer Reviewed
• [Journal Article] Challenge on 48Ca enrichment for CANDLES double beta decay experiment (2006)
  • Author(s): R.Hazama, Y.Tatewaki, T.Kishimoto, K.Matsuoka, Y.Shibahara, M.Tanimizu
  • Journal Title: Proc. of 6th Recontres du Vietnam (Challenges in Particle Astrophysics)
  • Peer Reviewed
• [Journal Article] CANDLES for double beta decay of $^ {48} $Ca (2006)
  • Author(s): S. Umehara, et. al.,
  • Journal Title: Journal of Physics: Conference Series, 39 Pages: 356-356
• [Journal Article] Cascade Gamma Decay in the 7ΛLi Hypernucleus (2006)
  • Author(s): M. Ukai, et. al.,
  • Journal Title: Physical Review C 73
• [Journal Article] 二重ベータ崩壊とCANDLES実験 (2005)
  • Author(s): 岸本忠史
  • Journal Title: 高エネルギーニュース 24 Pages: 182-182
  • Peer Reviewed
• [Journal Article] CANDLES for double beta decay of 48Ca (2005)
  • Author(s): S.Umehara, T.Kishimoto, I.Ogawa
  • Journal Title: J. of Phys. : Conf. Series 39 Pages: 356-356
  • Peer Reviewed
• [Journal Article] CANDLES project for double beta decay of 48Ca (2005)
  • Author(s): S.Yoshida, T.Kishimoto, I.Ogawa
  • Journal Title: Nuclear Physics B(Proc. Suppl. ) 138 Pages: 214-214
  • Peer Reviewed
• [Journal Article] CANDLES FOR THE STUDY OF double beta DECAY OF 48CA (2005)
  • Author(s): I.Ogawa, T.Kishimoto
  • Journal Title: Proc. of the 5th Int. Works. on Neutrino Oscillations and their Origin Pages: 260-260
• [Journal Article] CANDLES project for double beta decay of ^<48>Ca (2005)
  • Author(s): S.Yoshida et al.
  • Journal Title: Nclear Physics B (Proc.Suppl.) 138 Pages: 214-214
• [Journal Article] CANDLES FOR THE STUDY OF ββ DECAY OF ^<48>CA (2005)
  • Author(s): I.Ogawa et al.
  • Journal Title: Proc.of the 5th Int. Works. on Neutrino Oscillations and their Origin Pages: 260-260
• [Journal Article] Expected Performance of CANDELS III detector (2005)
  • Author(s): I.Ogawa et al.
  • Journal Title: OULNS Annual Report Pages: 1-1
• [Journal Article] Study of Light Propagation in CANDLES System (2005)
  • Author(s): S.Yoshida et al.
  • Journal Title: OULNS Annual Report Pages: 3-3
• [Journal Article] Development of pulse shape discrimination for CANDLES (2005)
  • Author(s): K.Ichihara et al.
  • Journal Title: OULNS Annual Report Pages: 7-7
• [Journal Article] Radioactive Contaminations in CaF_2(pure) Scintillators (2005)
  • Author(s): S.Umehara et al.
  • Journal Title: OULNS Annual Report Pages: 11-11
• [Journal Article] Dark matter search with CaF2 scintillator at Osaka
  • Author(s): I.Ogawa
  • Journal Title: Journal of Physics: Conference Series 120 Pages: 42019-42019
  • Peer Reviewed
• [Presentation] Kaon-Nucleus Interaction Studied through the In-Flight (K-, N) Reaction (2008)
  • Author(s): T.Kishimoto
  • Organizer: International Conference on Particles and Nuclei (PANIC08), Eilat (Israel)
  • Year and Date: 2008-11-13
• [Presentation] Study of 48Ca double beta decay with CANDLES (2008)
  • Author(s): I.Ogawa;
  • Organizer: International Conference on Particles and Nuclei (PANIC08)
  • Place of Presentation: Eilat (Israel)
  • Year and Date: 2008-11-13
• [Presentation] Study of 48Ca Double Beta Decay (2008)
  • Author(s): T.Kishimoto
  • Organizer: Franco-Japanese Symposium on New Paradigms in Nuclear Physics
  • Place of Presentation: Paris, France
  • Year and Date: 2008-09-30
• [Presentation] Study of 48Ca double beta decay with CANDLES (2008)
  • Author(s): I.Ogawa
  • Organizer: The XXIII International Conference on Neutrino Physics and Astrophysics
  • Place of Presentation: Christchurch (New Zealand)
  • Year and Date: 2008-05-28
• [Presentation] クラウンエーテル樹脂を用いたカルシウム同位体分離 (2008)
  • Author(s): 梅原さおり
  • Organizer: 第6回同位体科学研究会
  • Place of Presentation: 名古屋
  • Year and Date: 2008-03-05
• [Presentation] Study of 48Ca Double Beta Decay by CANDLES (2007)
  • Author(s): T.Kishimoto
  • Organizer: DUSEL Town Meeting
  • Place of Presentation: Washington(USA)
  • Year and Date: 2007-11-03
• [Presentation] Study of ^<48>Ca Double Beta Decay by CANDLES (2007)
  • Author(s): T. Kishimoto
  • Organizer: DUSEL Town Meeting
  • Place of Presentation: Washington, USA
  • Year and Date: 2007-11-03
• [Presentation] Double beta-decay at Oto laboratory (2007)
  • Author(s): T.Kishimoto
  • Organizer: The 3rd Japanese-German EFES(JSPS)-DFG/GSI workshop on Nuclear Structure and Astrophysics
  • Place of Presentation: Faruenchiemsee(Germany)
  • Year and Date: 2007-10-01
• [Presentation] Double beta-decay at Oto laboratory (2007)
  • Author(s): T. Kishimoto
  • Organizer: The 3rd Japanese-German EFES(JSPS)-DFG/GSI workshop on Nuclear Structure and Astrophysics
  • Place of Presentation: Faruenchiemsee, Germany
  • Year and Date: 2007-10-01
• [Presentation] CANDLESによる二重ベーダ崩壊の研究(24) -CANDLES III(地上)の現状報告- (2007)
  • Author(s): 小川泉
  • Organizer: 日本物理学会 第62回年会
  • Place of Presentation: 北海道
  • Year and Date: 2007-09-24
• [Presentation] CANDLESによる二重ベーダ崩壊の研究(25) -CANDLESIIIの基本特性と地上における測定- (2007)
  • Author(s): 平野祥之
  • Organizer: 日本物理学会 第62回年会
  • Place of Presentation: 北海道
  • Year and Date: 2007-09-24
• [Presentation] CANDLESによる二重ベーダ崩壊の研究(26)-FADCを用いたデータ収集システムー (2007)
  • Author(s): 梅原さおり
  • Organizer: 日本物理学会 第62回年会
  • Place of Presentation: 北海道
  • Year and Date: 2007-09-24
• [Presentation] CANDLESによる二重ベーダ崩壊の研究(27) -FPGAを用いたトリガー回路の研究- (2007)
  • Author(s): 伊藤豪
  • Organizer: 日本物理学会 第62回年会
  • Place of Presentation: 北海道
  • Year and Date: 2007-09-24
• [Presentation] CANDLESによる二重ベーダ崩壊の研究(28) -ライトガイドによる集光の改善- (2007)
  • Author(s): 坪田悠史
  • Organizer: 日本物理学会 第62回年会
  • Place of Presentation: 北海道
  • Year and Date: 2007-09-24
• [Presentation] CANDLES (2007)
  • Author(s): Y. Hirano
  • Organizer: The tenth International Conference on Topics in Astroparticle and Underground Physics
  • Place of Presentation: 仙台
  • Year and Date: 2007-09-14
• [Presentation] Double Beta Decays of ^<48>Ca with CaF_2 (Eu) (2007)
  • Author(s): S. Umehara
  • Organizer: The tenth International Conference on Topics in Astroparticle and Underground Physics
  • Place of Presentation: 仙台
  • Year and Date: 2007-09-14
• [Presentation] CANDLES light Guide system (2007)
  • Author(s): Y. Tsubota
  • Organizer: The tenth International Conference on Topics in Astroparticle and Underground Physics
  • Place of Presentation: 仙台
  • Year and Date: 2007-09-14
• [Presentation] CANDLES trigger system (2007)
  • Author(s): G. Ito
  • Organizer: The tenth International Conference on Topics in Astroparticle and Underground Physics
  • Place of Presentation: 仙台
  • Year and Date: 2007-09-14
• [Presentation] The ELEGANT VI experiment (2007)
  • Author(s): I.Ogawa
  • Organizer: The tenth International Conference on Topics in Astroparticle and Underground Physics
  • Place of Presentation: Sendai(Japan)
  • Year and Date: 2007-09-12
• [Presentation] The ELEGANT VI experiment (2007)
  • Author(s): I. Ogawa
  • Organizer: The tenth International Conference on Topics in Astroparticle and Underground Physics
  • Place of Presentation: 仙台
  • Year and Date: 2007-09-12
• [Presentation] Study of Double Beta Decay with CANDLES (2007)
  • Author(s): T. Kishimoto
  • Organizer: International Workshop on "Towards a New Basic Science: Depth and Synthesis"
  • Place of Presentation: 大阪
  • Year and Date: 2007-09-10
• [Presentation] In flight (K-, N) reactions for the study of the kaon-nucleus interaction (2007)
  • Author(s): T.Kishimoto
  • Organizer: 3rd China-Japan-Korea Hadron and Nuclea Physics 2008 Symposium (HNP08)
  • Place of Presentation: Paris(France)
  • Year and Date: 2007-06-25
• [Presentation] Status and Future of Dark Matter Seach and Double Beta Decay (2007)
  • Author(s): T. Kishimoto
  • Organizer: Supersymmetry in 2010's
  • Place of Presentation: 北海道
  • Year and Date: 2007-06-22
• [Presentation] Purification of scintillating crystal (2007)
  • Author(s): S. Umehara
  • Organizer: International Workshop on "Double Beta Decay and Neutrinos"
  • Place of Presentation: 大阪
  • Year and Date: 2007-06-12
• [Presentation] Study of ^<48>Ca double beta decay by CANDLES (2007)
  • Author(s): T. Kishimoto
  • Organizer: International Workshop on "Double Beta Decay and Neutrinos"
  • Place of Presentation: 大阪
  • Year and Date: 2007-06-11
• [Presentation] Study of 48Ca double beta decay with CANDLES (2007)
  • Author(s): I.Ogawa
  • Organizer: International Nuclear Physics Conference
  • Place of Presentation: Tokyo(Japan)
  • Year and Date: 2007-06-05
• [Presentation] Study of ^<48>Ca double beta decay with CANDLES (2007)
  • Author(s): I. Ogawa
  • Organizer: International Nuclear Physics Conference
  • Place of Presentation: 東京
  • Year and Date: 2007-06-05
• [Remarks]
  • URL: http://wwwkm.phys.sci.osaka-u.ac.jp/info/syoukai/CANDLES_project.htm
• [Remarks]
  • URL: http://wwwkm.phys.sci.osaka-u.ac.jp/info/syoukai/CANDLES_project.htm