Proton Pair Correlations And The Neutrinoless Double-β Decay Of 76Ge
Proton pair correlations relevant for the neutrinoless double-beta decay of Ge-76 have been probed via the Ge-74,Ge-76(He-3,n) reactions at 16 MeV. No evidence for pairing vibrations in either nucleus is observed at sensitivity limits of similar to 6% and similar to 19% of the ground-state strength in Se-76 and Se-78, respectively. These results are relevant for the understanding of matrix elements for neutrinoless double-beta decay. The lack of pairing vibrations is consistent with a simple BCS structure for the ground states of Ge-76 and Se-76, assumed in quasiparticle random phase approximation (QRPA) models of the process.
Roberts, A., A. M. Howard, J. J. Kolata, A. N. Villano, F. D. Becchetti, Paul A. DeYoung, M. Febbraro, S. J. Freeman, B. P. Kay, S. A. McAllister, A. J. Mitchell, J. P. Schiffer, J. S. Thomas and R. O. Torres-Isea. "Proton Pair Correlations and the Neutrinoless Double-Β Decay of 76ge." Physical Review C 87, no. 5 (2013). http://link.aps.org/doi/10.1103/PhysRevC.87.051305