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

Fedor Šimkovic, Vadim Rodin, Amand Faessler +1

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,…