Double beta decay transition mechanism
Abstract
After briefly reviewing β β decay as a test of the neutrino mass, I examine the nuclear structure involved in this process. Simple formulas (\`a la Pad\'e) are designed for the transition amplitudes and the general behavior of β β 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 <m>≈ 1 eV is obtained for the effective neutrino mass.
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