1209.5981 (P. Sarriguren)

Deformation effects on the Gamow-Teller strength distributions in the
double-beta decay partners 76Ge and 76Se    [PDF]

P. Sarriguren

A theoretical approach based on a deformed quasiparticle random phase approximation built on a Skyrme selfconsistent mean field is used to describe the recent measurements of the Gamow-Teller GT- strength distribution extracted from the charge-exchange reaction 76Ge(3He,t)76As with high energy resolution. The same analysis is made to describe the Gamow-Teller GT+ strength distribution measured in the 76Se(d,2He)76As reaction. Combining these two branches, the nuclear matrix element for the two-neutrino double-beta decay process is evaluated and compared to experiment. The role of the nuclear deformation on those processes is emphasized and analyzed.

View original: http://arxiv.org/abs/1209.5981