Partial restoration of isospin symmetry for neutrinoless double beta decay in the deformed nuclear system of ${}^{150}$Nd

Abstract

In this work, we calculate the matrix elements of $0\nu \beta \beta$-decay of ${}^{150}$Nd with the deformed pn-QRPA method. We adopted the approach introduced by Rodin, Faessler [Phys. Rev. C84, 014322 (2011)] and Simkovic {\it et. al.} [Phys. Rev. C87,045501(2013)] to restore the isospin symmetry by enforcing $M_F^{2\nu }=0$. We found that with this restoration, the Fermi matrix elements are reduced by about 30\% while the more important Gamow-Teller matrix elements remains the same. The results of an enlarged model space is also presented, which changes the matrix elements by less than 10\%.

Comments: 5 pages, 1 figure, accepted by Phys. Rev. C