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中国科学院上海原子核研究所
纸质出版日期:1998-04-01
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[1]顾嘉辉,刘静怡,何四言,余笑寒,曾寄萍,曹玉祥,李燕,石双惠.用于核态寿命测量的X-γ-γ定时符合系统[J].核技术,1998(04):193-198.
GU Jiahui LIU Jingyi HE Siyan YU Xiaohan ZENG Jiping CAO Yuxiang LI Yan SHI Shuanghui. An X-γ-γ timing coincidence system used for life timemeasurement of nuclear levels[J]. Nuclear techniques, 1998, (4).
由两只BaF2闪烁探测器和一只高纯锗探测器组成的延迟符合系统适用于电子俘获衰变和E0跃迁生成的ns和ps量级激发态寿命测量。快符合涉及特征X射线和相应的级联衰变γ射线测量,系统具有元素和级联选择的优点。该系统对放射性核素152 ̄Eu进行测量,除得到X-γ-γ瞬发时间谱的半高全宽度外,还分别得到121.78keV和366.48keV能级的半寿命分别为1.395±0.035ns和48±10ps。结果表明该系统适用于Z≥62的电子俘获衰变研究。
A delayed coincidence timing system consisting of two BaF2 scintillation detectors and a HPGe detector and operating in fast-slow coincidence mode has been set up.It is suitable for the measurement of lifetime in the ns and ps range for nuclear levels populated by EC decay and E0 transitions. The fast coincidences involve characteristic X-rays and cascade γ rays coming from correlated levels. The system has the advantage of both element and cascade choices. Radioactive isotope 152Eu has been measured
The half-lives of 1.395± 0.035 ns and 48± 10 ps are observed for 121.78keV and 366.48keV levels respectively. These results show that the system can be used for the elements of Z≥62 with EC decays.
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