Development of surface contamination measurement with a scintillation film

• Project/Area Number: 15K13473
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: Ikeda Haruo 東北大学, ニュートリノ科学研究センター, 助教 (90400233)
• Research Collaborator: SHIBUKAWA Yuna
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 極低放射能環境 / 表面汚染測定 / 表面汚染

Outline of Final Research Achievements

Radioactive contamination on the large detector surface makes serious background events for observing rare physics phenomenon like neutrino less double beta decay. Its measurement has been difficult because of the detector’s structure and materials. Alpha ray detection on the surface is useful method of understanding radioactive contamination. One sided scintillation film can measure only the surface contamination of the detector and separate environmental radioactive signals from beta and gamma rays using the time structure of scintillation light.

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] 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] 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
• [Presentation] シンチレーションフィルムによる表面汚染測定法の開発 (2016)
  • Author(s): 澁川友菜, 池田晴雄
  • Organizer: 日本物理学会
  • Place of Presentation: 宮崎大学(宮崎県・宮崎市)
  • Year and Date: 2016-09-22
• [Presentation] シンチレーションフィルムによる表面汚染測定法の開発 (2016)
  • Author(s): 澁川友菜 池田晴雄
  • Organizer: 日本物理学会
  • Place of Presentation: 東北学院大学（宮城、仙台）
  • Year and Date: 2016-03-19
• [Presentation] KamLAND の課題 (2016)
  • Author(s): 池田晴雄
  • Organizer: 「極低放射能技術」研究会
  • Place of Presentation: 徳島大学(徳島)
  • Year and Date: 2016-03-13
  • Invited