Change Of ～7Be Decay Rate In Be And Au

We find the decay rate of 7Be in Be is smaller than that in Au. The change of decay rate (0.71 +0.32)%,indicates that the environment can indeed alter the decay rate,and the Electronic Affinity is not the only factor affecting the decay rate,so that one has to take the structure of the host materials into account in explaining the change of the decay rate. The results can be used to accurately extract the nuclear matrix of the astrophysically significant 7Be+e--7Li+v reaction. The method we used may find important application in condensed matter physics.