Development of new liquid scintillator for neutrinoless double beta decay

• Project/Area Number: 26800116
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: 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): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: ニュートリノ / 二重ベータ崩壊 / 液体シンチレータ / カムランド / 素粒子実験

Outline of Final Research Achievements

Neutorinoless double beta decay requires Majorana nature of neutrino and various experiments search for this decay. Next target of experiments is to search for inverted hierarchy; its target half life reaches to 10 to the power 26-27 year. For a large liquid scintillator experiment, improvement of energy resolution is quite important.
We developed linear alkyl benzene based liquid scintillator with high light yield. Purification method is evaluated and its light yield is 1.52 times higher than current liquid scintillator.

Research Products

• [Journal Article] KamLAND Sensitivity to Neutrinos from Pre-Supernova Stars (2016)
  • Author(s): K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara, T. Oura, I. Shimizu, Y. Shirahata, J. Shirai,K. et al.
  • Journal Title: The Astrophysical Journal Volume: 818 Issue: 1 Pages: 91-91
  • DOI: 10.3847/0004-637x/818/1/91
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment (2016)
  • Author(s): K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara, M. Otani, T. Oura, I. Shimizu, Y. Shirahata, et al.
  • Journal Title: Nuclear Physics A Volume: 946 Pages: 171-181
  • DOI: 10.1016/j.nuclphysa.2015.11.011
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Study of electron anti-neutrinos associated with gamma-ray bursts using KamLAND (2015)
  • Author(s): K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara, Y. Oki, T. Oura, I. Shimizu, Y. Shirahata, et al.
  • Journal Title: The Astrophysical Journal Volume: 806 Issue: 1 Pages: 87-87
  • DOI: 10.1088/0004-637x/806/1/87
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for the proton decay mode p→nubar K+ with KamLAND (2015)
  • Author(s): K. Asakura, A. Gando, Y. Gando, T. Hachiya, S. Hayashida, H. Ikeda, K. Inoue, K. Ishidoshiro, T. Ishikawa, S. Ishio, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakamura, S. Obara1, Y. Oki, T. Oura, I. Shimizu, et al.
  • Journal Title: Physical Review D Volume: 92 Issue: 5 Pages: 0520006-0520006
  • DOI: 10.1103/physrevd.92.052006
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 7Be solar neutrino measurement with KamLAND (2015)
  • Author(s): A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, Y. Kishimoto, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D. Motoki, K. Nakajima, K. Nakamura, A. Obata, A. Oki, Y. Oki, M. Otani, I. Shimizu, et al.
  • Journal Title: Physical Review C Volume: 92 Issue: 5 Pages: 055808-055808
  • DOI: 10.1103/physrevc.92.055808
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Laboratory studies on the removal of radon-born lead from KamLAND’s organic liquid scintillator (2015)
  • Author(s): KamLAND Collaboration
  • Journal Title: Nuclear Instruments and Methods A Volume: 769 Pages: 79-87
  • DOI: 10.1016/j.nima.2014.09.050
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector (2014)
  • Author(s): T.I. Banks, S.J. Freedman, J. Wallig, N. Ybarrolaza, A. Gando, Y. Gando , H. Ikeda, K. Inoue, Y. Kishimoto, M. Koga et al.
  • Journal Title: Nucl.Instrum.Meth. Volume: A769 Pages: 8-8
  • DOI: 10.1016/j.nima.2014.09.068
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] KamLAND2-Zen実験用液体シンチレータ開発の現状 (2015)
  • Author(s): 大浦智也
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 大阪市立大学杉本キャンパス (大阪府大阪市)
  • Year and Date: 2015-09-25
• [Presentation] Search for neutrinoless double beta decay with KamLAND-Zen (2015)
  • Author(s): A. Gando for the KamLAND-Zen Collaboration
  • Organizer: Neutrinos and Dark Matter in Nuclear Physics 2015
  • Place of Presentation: Jyvaskyla, Finland
  • Year and Date: 2015-06-03
  • 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): 大浦智也, 他KamLAND-Zen Collaboration
  • Organizer: 日本物理学会第70回年次大会(2015年)
  • Place of Presentation: 早稲田大学 (東京都)
  • Year and Date: 2015-03-21
• [Presentation] Recent results from KamLAND-Zen (2015)
  • Author(s): Azusa Gando for KamLAND-Zen Collaboration
  • Organizer: 50th Rencontre de Moriond
  • Place of Presentation: La Thuile, Italy
  • Year and Date: 2015-03-15
  • Invited
• [Presentation] KamLAND-Zen純化後のデータを用いた136Xe二重ベータ崩壊の寿命測定 (2014)
  • Author(s): 丸藤亜寿紗, 他KamLAND-Zen Collaboration
  • Organizer: 日本物理学会2014秋季大会
  • Place of Presentation: 佐賀大学 (佐賀県)
  • Year and Date: 2014-09-20
• [Presentation] KamLAND2-Zen実験用液体シンチレータ開発の現状 (2014)
  • Author(s): 大浦智也, 他KamLAND-Zen Collaboration
  • Organizer: 日本物理学会2014秋季大会
  • Place of Presentation: 佐賀大学 (佐賀県)
  • Year and Date: 2014-09-20
• [Remarks] 東北大学ニュートリノ科学研究センター
  • URL: http://www.awa.tohoku.ac.jp/rcns/
• [Remarks] KamLAND
  • URL: http://www.awa.tohoku.ac.jp/kamland/