Abstract
A high-resolution () charge-exchange experiment at an incident energy of 420 MeV has been performed on the double beta () decay nucleus . A detailed Gamow-Teller () strength distribution in has been extracted, which provides information to the -decay nuclear matrix elements. Three strong and isolated transitions, which are to the 75, 1484 and the 2087 keV states in , are found to dominate the low-excitation region below MeV. Above 2.1 MeV a sudden onset of a strong GT fragmentation is observed. The degree of fragmentation resembles a situation found in the neighboring system , whereas the observed concentration of strength in the three low-lying states is reminiscent of the heavier neighbors and . The strong GT transition to the 75 keV state makes interesting for solar neutrino detection. The solar neutrino capture rate in a nonoscillation scenario is therefore evaluated to SNU, and some of the advantages of using selenium for solar neutrino studies are discussed.
- Received 23 May 2016
DOI:https://doi.org/10.1103/PhysRevC.94.014614
©2016 American Physical Society