A Study for the 4th Neutrino Search with KamLAND

• Project/Area Number: 25400292
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: NAKAMURA KENGO 東北大学, ニュートリノ科学研究センター, 講師 (10400219)
• Co-Investigator(Renkei-kenkyūsha): SHIMIZU Itaru 東北大学, ニュートリノ科学研究センター, 助教 (10400227)
• Research Collaborator: MATSUDA Sayuri 東北大学, 大学院理学研究科, 博士
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 4th ニュートリノ / 第４世代ニュートリノ

Outline of Final Research Achievements

Re-analysis of past reactor neutrino experiments is suggesting the existence of the 4th neutrinos. KamLAND experiment that has achieved important measurements of the neutrino oscillation parameters has a potential to explore the 4th neutrinos.
Technical design of implementing an anti-neutrino generator into the KamLAND has been developed in this study. It has been shown that it is feasible to perform an experiment to explore the 4th neutrinos with KamLAND.

Research Products

• [Journal Article] CeLAND: search for a 4th light neutrino state with a 3 PBq 144Ce-144Pr anti νe generator in KamLAND (2013)
  • Author(s): A. Gando, Y. Gando, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui,D. Motoki, K. Nakamura, Y. Oki, M. Otani, I. Shimizu, J. Shirai, F. Suekane, A. Suzuki, Y. Takemoto et al. Ce-LAND collaboration
  • Journal Title: arXiv Volume: 1312.0896 Pages: 1-67
• [Presentation] KamLAND 外部検出器の改修報告 (2016)
  • Author(s): 尾崎秀義, 他KamLAND Collaboration
  • Organizer: 日本物理学会第７１回年次大会
  • Place of Presentation: 東北学院大学 泉キャンパス（宮城・仙台）
  • Year and Date: 2016-03-19
• [Presentation] KamLAND (2014)
  • Author(s): 中村健悟
  • Organizer: 日本物理学会北陸支部特別講演会
  • Place of Presentation: 福井大学、福井県福井市
  • Year and Date: 2014-11-21
  • Invited
• [Presentation] CeLAND実験：KamLAND検出器へのCe反ニュートリノ源の導入 (2014)
  • Author(s): 中村 健悟
  • Organizer: 日本物理学会第６９回年次大会
  • Place of Presentation: 東海大学
• [Presentation] CeLAND実験：シミュレーションによるバックグラウンド事象の評価 (2014)
  • Author(s): 松田 さゆり
  • Organizer: 日本物理学会第６９回年次大会
  • Place of Presentation: 東海大学
• [Presentation] CeLAND実験：ステライルニュートリノ探索における系統誤差の評価 (2014)
  • Author(s): 清水 格
  • Organizer: 日本物理学会第６９回年次大会
  • Place of Presentation: 東海大学