^7Be在Pd和Au中衰变率变化的相对测量

Measurement of Decay Rate Variation of ^7Be in Pd and Au

将HI-13串列加速器次级束流线产生的放射性核素7Be分别注入到Pd和Au中,利用两个高纯锗探测器同时测量7Be EC衰变核素7Li第一激发态放出的478 keVγ射线产额随时间的变化,发现7Be在Pd中的衰变率比在Au中大(0.8±0.2)%,并讨论了衰变率差别与这两种材料的电子亲合势及有效电子密度的关系。

We measured the variation of the decay rate of 7Be implanted in Pd and Au host materials by detecting the 478 keV γ ray emitted from deexcitation of the first excited state of 7Li which is produced by EC decay of 7Be with two HPGe detectors simultaneously,and found that the decay rate of 7Be in Pd is larger than that in Au by（0.8±0.2）%.The relation of the decay rate variation with electronic affinities and effective electron densities near the implanted ions in the two different host materials has been discussed.