Neutrinoless double-beta decay matrix elements in large shell-model spaces with the generator-coordinate method

Abstract

We use the generator-coordinate method with realistic shell-model interactions to closely approximate full shell-model calculations of the matrix elements for the neutrinoless double-beta decay of ${}^{48}$Ca, ${}^{76}$Ge, and ${}^{82}$Se. We work in one major shell for the first isotope, in the $f_{5/2}p{g}_{9/2}$ space for the second and third, and finally in two major shells for all three. Our coordinates include not only the usual axial deformation parameter $\beta$, but also the triaxiality angle $\gamma$ and neutron-proton pairing amplitudes. In the smaller model spaces our matrix elements agree well with those of full shell-model diagonalization, suggesting that our Hamiltonian-based GCM captures most of the important valence-space correlations. In two major shells, where exact diagonalization is not currently possible, our matrix elements are only slightly different from those in a single shell.

8 pages, 7 figures

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