Study of Majorana Neutrino Mass with High Luminance Liquid Scintillator Detector

• Project/Area Number: 15H03649
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: Shimizu Itaru 東北大学, ニュートリノ科学研究センター, 准教授 (10400227)
• Co-Investigator(Renkei-kenkyūsha): KOGA MASAYUKI 東北大学, ニュートリノ科学研究センター, 准教授 (90343029) ; IKEDA HARUO 東北大学, ニュートリノ科学研究センター, 助教 (90400233) ; GANDO AZUSA 東北大学, ニュートリノ科学研究センター, 教育研究支援者 (20704399)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000); Fiscal Year 2017: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2016: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000); Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: ニュートリノ / 素粒子実験 / 実験核物理 / 液体シンチレータ開発

Outline of Final Research Achievements

The development of a liquid scintillator detector to search for the Majorana neutrino mass was performed. We found that molecular sieve and activated charcoal are effective to remove light absorbing materials in the liquid scintillator, resulting in improved performance. The increase of the light output and transparency of the scintillator will enhance the detector performance. The present study enables us to reduce the cost of constructing a large detector and increases the chance of observing the Majorana neutrino mass with a liquid scintillator detector.

Research Products

• [Int'l Joint Research] University of California, Berkeley/Lawrence Berkeley National Laboratory/Massachusetts Institute of Technology(米国)
• [Int'l Joint Research] University of Amsterdam(オランダ)
• [Int'l Joint Research] University of California, Berkeley/Lawrence Berkeley National Laboratory/Massachusetts Institute of Technology(米国)
• [Int'l Joint Research] University of Amsterdam(オランダ)
• [Int'l Joint Research] University of California, Berkeley/Lawrence Berkeley National Laboratory/University of California, Los Angels(米国)
• [Int'l Joint Research] University of Amsterdam(オランダ)
• [Journal Article] Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen (2016)
  • Author(s): 清水格
  • Journal Title: Physical Review Letters Volume: 117 Issue: 8 Pages: 082503-082503
  • DOI: 10.1103/physrevlett.117.082503
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Results from KamLAND-Zen (2015)
  • Author(s): 清水格
  • Journal Title: AIP Conference Proceedings Volume: 1666 Pages: 170003-170003
  • DOI: 10.1063/1.4915593
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] New Liquid Scintillator Detector to Search for Neutrinoless Double Beta Decay of 136Xe (2018)
  • Author(s): 清水格
  • Organizer: Workshop for Unification and Development of the Neutrino Science Frontier (2017)
  • Invited
• [Presentation] 公募研究：メタルスカベンジャーによる液体シンチレータ検出器の極低放射能化 (2017)
  • Author(s): 清水格
  • Organizer: 「宇宙の歴史をひもとく地下素粒子原子核研究」2017年領域研究会
  • Invited
• [Presentation] KamLAND2-Zen実験で用いる新液体シンチレータの活性炭による吸着純化 (2017)
  • Author(s): 上澤康平
  • Organizer: 日本物理学会
• [Presentation] ニュートリノ実験のための低放射能化 (2017)
  • Author(s): 清水格
  • Organizer: 第９回アルファ放射体実験室利用研究会合同研究会
  • Invited
• [Presentation] Broad Overview of Neutrino Physics (2017)
  • Author(s): 清水格
  • Organizer: International Workshop：Neutrino Research and Thermal Evolution of the Earth
  • Int'l Joint Research / Invited
• [Presentation] KamLAND and KamLAND-Zen (2016)
  • Author(s): 清水格
  • Organizer: Frontiers of liquid Scintillator Technology (FroST16)
  • Place of Presentation: Chicago（米国）
  • Year and Date: 2016-03-18
  • Int'l Joint Research / Invited
• [Presentation] Double Beta Decay (2016)
  • Author(s): 清水格
  • Organizer: PhyStat-ν Workshop
  • Int'l Joint Research / Invited
• [Presentation] KamLAND2-Zen実験用液体シンチレータ開発の現状 (2015)
  • Author(s): 大浦
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 大阪市立大学（大阪市）
  • Year and Date: 2015-09-25
• [Presentation] Matter Dominated Universe and Majorana Neutrino (2015)
  • Author(s): 清水格
  • Organizer: Joint symposium by three innovative areas: Gravitational Wave Source / Underground Particle-Nuclear Research / Neutron Star Matter "Universe and Astronomical Objects Uncovered by Multi-Fold Approach"
  • Place of Presentation: 東北大学（仙台市）
  • Year and Date: 2015-07-24
  • Invited
• [Presentation] Neutrino Mass Measurements Asia (2015)
  • Author(s): 清水格
  • Organizer: Second International Meeting for Large Neutrino Infrastructures
  • Place of Presentation: Chicago（米国）
  • Year and Date: 2015-04-20
  • Int'l Joint Research / Invited
• [Remarks] カムランド
  • URL: http://www.awa.tohoku.ac.jp/kamland/