On improvements of Double Beta Decay using FQTDA Model

L DE OLIVEIRA; A. SAMANA; F. KRMPOTIC; A. MARIANO; C. BARBERO

Journal of Physics: Conference Series

IOP Publishing

Año: 2015 vol. 630 p. 120481 - 120489

The Quasiparticle Tamm-Dancoff Approximation (QTDA) is applied to describe the nucleardouble beta decay with two neutrinos. Several serious inconveniences found in the QuasiparticleRandom Phase Approximation (QRPA) are not present in the QTDA, as such as the ambiguityin treating the intermediary states, and further approximations necessary for evaluation of thenuclear matrix elements (NMEs) or, the extreme sensitivity of NME with the ratio betweenthe pn and pp + nn pairings. Some years ago, the decay 48Ca --> 48Ti was discussed within theparticle-hole limit of QTDA. We found some mismatch in the numerical calculations when thefull QTDA was being implemented, and a new performance in the particle-hole limit of QTDAis required to guarantee the delity of the approximation.