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

通过亚纳秒区域的寿命测量来研究富中子变形核预期的核结构变化

• 批准号: 21740185
• 负责人: KOJIMA Yasuaki
• 金额: $ 2.91万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740185/
• 关键词: 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

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.

我们研制了一种由LaBr_3和薄塑料闪烁体组成的谱仪，旨在用于测量能级寿命。该谱仪对100 keV左右的γ射线具有600 ps的时间分辨率。这意味着该光谱仪能够在低至亚纳秒的时间范围内测量寿命。对于质量分离的^<93>Sr和^<148>Ce，观察到的能级寿命与先前评估的值一致。首次成功地获得了~ 1 Pr中98.2keV能级8.5（5）ns的寿命<148>。