engleski

Weak magnetism in two neutrino double beta decay

We have extended the formalism for the two-neutrino double beta decay by including the weak-magnetism term, as well as other second-forbidden corrections. The weak magnetism diminishes the calculated half-lives in ~ 10%, independently of the nuclear structure.Numerical computations were performed within the pn-QRPA, for 76Ge, 82Se, 100Mo, 128Te and 130Te nuclei. Not one of the second-forbidden corrections modifies signifincatly the spectrum shapes. The total reduction in the calculated half lives varies from 6% up to 32%, and strongly depend on the nuclear interaction in the particle-particle S = 1, T = 0 channel.We conclude that the higher order effects in the weak Hamiltonian cannot be observed in the two-neutrino double beta experiments.

double beta decay; weak magnetism; half lives

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