Investigation of nuclear structure change expected for neutronrich deformed nuclei by means of lifetime measurements in sub-nanosecond region

• Project/Area Number: 21740185
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Hiroshima University
• Principal Investigator: KOJIMA Yasuaki Hiroshima University, 大学院・工学研究院, 助教 (80314730)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2009: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 実験核物理 / 寿命測定 / 遅延同時計数 / ランタンブロマイドシンチレータ / 遅延同時計測 / LaBr3シンチレニタ

Research Abstract

We have developed a spectrometer consisting of a LaBr_3 and a thin plastic scintillator, aiming for use to measure level lifetimes. The spectrometer showed a good time resolution of 600ps for γ rays with energies around 100keV. This means that the spectrometer is sufficiently capable of measuring lifetimes in a time range down to sub-nanosecond. Level lifetimes observed for mass-separated ^<93>Sr and ^<148>Ce agreed with the well-evaluated previous values. The lifetime of 8.5(5)ns for the 98.2keV level in ^<148>Pr was successfully obtained for the first time.

Research Products

• [Journal Article] Neutron onequasiparticle states in 251Fm151 popula ted via the alpha decay of 255No (2011)
  • Author(s): M.Asai, K.Tsukada, H.Haba, Y.Ishii, T.Ichikawa, A.Toyoshima, T.Ishii, Y.Nagame, I.Nishinaka, Y.Kojima, K.Sueki
  • Journal Title: Phy sical Review C 83
  • Peer Reviewed
• [Journal Article] Neutron one-quasiparticle states in ^<251>Fm_<151> populated via the alpha decay of ^<255>No (2011)
  • Author(s): M.Asai, et al.
  • Journal Title: Physical Review C Volume: 83
  • Peer Reviewed
• [Journal Article] Property Measurements on a LaBr3 Scintillator as a Fast γ-ray Detector (2010)
  • Author(s): Y.Kojima, K.Shizuma
  • Journal Title: KURRI Progress Report Pages: 124-124
• [Journal Article] Property Measurements on a LaBr_3 Scintillator as a Fast γ-ray Detector (2010)
  • Author(s): Y.Kojima, et al.
  • Journal Title: KURRI Progress Report Pages: 124-124
• [Presentation] コバルト60ガンマ線照射によるSr-87の核異性体励起 (2010)
  • Author(s): 日隈聖也, 小島康明, 遠藤暁, 静間清
  • Organizer: 日本原子力学会中国・四国支部第4回研究発表会
  • Place of Presentation: 広島商工会議所(広島市)
  • Year and Date: 2010-09-24
• [Presentation] コバルト60ガンマ線照射によるSr-87の核異性体励起 (2010)
  • Author(s): 日隈聖也
  • Organizer: 日本原子力学会中国・四国支部 第4回研究発表会
  • Place of Presentation: 広島商工会議所(広島市)
  • Year and Date: 2010-09-24
• [Presentation] 115mInの光共鳴励起を利用した60Coγ線照射室の線量分布 (2009)
  • Author(s): 村高礼典, 小島康明, 遠藤暁, 静間清
  • Organizer: 日本原子力学会中国・四国支部第3回研究発表会
  • Place of Presentation: 中国電力(株)島根支社(松江市)
  • Year and Date: 2009-09-11
• [Remarks] ホームページ等
  • URL: http://home.hiroshima-u.ac.jp/qea/