Abstract

The results are given for an experiment on measuring the difference between the values of triton beta decay constant in atomic and molecular tritium, Δλam=λa−λm. In order to determine Δλam, the growth rates of the relative content of radiogenic helium-3 in samples with atomic and molecular tritium have been compared. The value of Δλam=(4.6±0.8)×10−12 s−1 has been obtained, which corresponds to a relative change of the decay constant by ∼0.26%. Using the value of Δλam measured, the following value of the half-life of atomic tritium has been derived: (T1/2)a=(12.264±0.018) years.

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