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 ⁸²Se 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 billion years ago. The experimental data for ¹³⁰Te are also analyzed. It is shown that geochemical measurements on young minerals give lower values of T_1/2 (¹³⁰Te) and T_1/2 (⁸²Se) 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 performed with the aid of counters and geochemical experiments are discussed.