天然Pt和Al对比材料中^7Be衰变率差别的测量  

Measurement of Decay Rate Variation of 7Be in Pt and Al

作　　者：李成波[1] 文群刚[1] 孟秋英[1] 刘志毅[1] 周书华[1] 李笑梅[1] 周静[1] 傅元勇[1] 胡守扬[1] 周峰[1] 李守平[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《原子核物理评论》2008年第3期236-239,共4页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(10305020)~~

摘　　要：将HI-13北京串列加速器次级束流线产生的放射性核素7Be分别注入到天然Pt和Al中,利用两个高纯锗探测器同时测量7Be经由7Li第一激发态衰变后跃迁到基态产生的478keVγ射线产额随时间的变化,结果在实验误差范围内(<0.14%)没有发现7Be衰变率在Pt与Al中有明显差别,讨论了这两种材料的电子亲和势及有效电子密度与EC衰变率的关系。We measured the variation of the decay rate of ^7Be implanted in Pt and Al host materials by detecting the 478 keV γ-ray emitted from the first excited state of ^7Li which is produced by EC decay of ^7Be with two HPGe detectors simultaneously, and found no difference of ^7Be decay rate in Pt from that in Al within our experimental error （〈0.14%）. We discussed the relation of the decay rate variation with the electronic affinities and effective electron densities near the implanted ions in the two different host materials.

关 键 词：电子俘获 衰变率 电子亲和势 有效电子密度 

分 类 号：O571.322[理学—粒子物理与原子核物理]