Double beta decay transition mechanism
F. Krmpotić
Abstract
After briefly reviewing ββ decay as a test of the neutrino mass, I examine the nuclear structure involved in this process. Simple formulas (à la Padé) are designed for the transition amplitudes and the general behavior of ββ decay amplitudes in the quasiparticle random phase approximation are discussed. Results of a calculation for 48Ca, 76Ge , 82Se, 100Mo, 128Te and 130Te nuclei are presented, in which the particle-particle interaction strengths have been fixed by invoking the partial restoration of the isospin and Wigner SU(4) symmetries. An upper limit of <mν>≈ 1 eV is obtained for the effective neutrino mass.
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