Measurement of Difference of Half-Life of ~7Be in Be and Au

The half-life T_(1/2) of ~7Be implanted in natural beryllium and natural gold has been measured using two coaxial high-purity germanium detectors to be 53.275(25) d and 53.270(19) d,respectively.No difference in the half-life of ~7Be in the host media beryllium and gold is observed within measurement uncertainty of 0.12%.This result implies that the change of the decay rate of ~7Be implanted in different materials can not be simply expected from the electron affinity difference consideration alone and the(lattice) structure of the host materials should be taken into account.