$0\nu \beta \beta$ and $2\nu \beta \beta$ nuclear matrix elements, QRPA, and isospin symmetry restoration

Abstract

Within QRPA we achieve partial restoration of the isospin symmetry and hence fulfillment of the requirement that the $2\nu \beta \beta$ Fermi matrix element $M_F^{2\nu }$ vanishes, as it should, unlike in the previous version of the method. This is accomplished by separating the renormalization parameter $g_{pp}$ of the particle-particle proton-neutron interaction into the isovector and isoscalar parts. The isovector parameter $g_{pp}^{T=1}$ need to be chosen to be essentially equal to the pairing constant $g_{pair}$, so no new parameter is needed. For the $0\nu \beta \beta$ decay the Fermi matrix element $M_F^{0\nu }$ is substantially reduced, while the full matrix element $M^{0\nu }$ is reduced by $\approx$ 10%. We argue that this more consistent approach should be used from now on in the proton-neutron QRPA and in analogous methods.

11 pages, 5 figures, typos removed, references updated, accepted in Phys. Rev. C

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