Possible Evidence of Time Variation of Weak Interaction Constant from Double Beta Decay Experiments

A comparison is made of the probability of the process of two neutrino double beta decay for Se in direct (counter) and geochemical experiments. It is shown that the probability is systematically lower in geochemical experiments, which characterize the probability of ββ(2ν) decay a few billions years ago. The experimental data for Te are also analyzed. It is shown that geochemical measurements on young minerals give lower values of T1/2( Te) and T1/2( Se) as compared to measurements on old minerals. It is proposed that this could be due to a change in the weak interaction constant with time. Possibilities of new, precise measurements be performed with the aid of counters and geochemical experiments are discussed.