Effects of orbital occupancies on the neutrinoless beta beta matrix element of Ge-76

作者：Suhonen J^*; Civitarese O

来源：Physics Letters B, 2008, 668(4): 277-281.

DOI：10.1016/j.physletb.2008.08.056

• Neutrinoless double beta decay
• Nuclear matrix elements
• Orbital occupancies

In this work we use the recently measured neutron occupancies in the Ge-76 and Se-76 nuclei as a guideline to define the neutron quasiparticle states in the 1p0f0g shell. We define the proton quasiparticles by inspecting the odd-mass nuclei adjacent to Ge-76 and Se-76. We insert the resulting quasiparticles in a proton-neutron quasiparticle random-phase approximation (pnQRPA) calculation of the nuclear matrix element of the neutrinoless double beta (O nu beta beta) decay of Ge-76. A realistic model space and effective microscopic two-nucleon interactions are used. We include the nucleon-nucleon short-range correlations and other relevant corrections at the nucleon level. It is found that the resulting O nu beta beta matrix element is smaller than in the previous pnQRPA calculations, and closer to the recently reported shell-model results.

• 出版日期2008-10-16