Under the assumption of isospin symmetry, Tz=±3/ 2→±1/2 Gamow-Teller (GT) transitions in an isobar quartet with a mass A are analogous, where Tz=(1/2)(N-Z) is the z component of the isospin T. We studied the Tz=+3/2→+1/2 GT transitions by the 37Cl(3He,t)37Ar reaction at an incoming beam energy of Ebeam=140 MeV/nucleon with an energy resolution of ΔE=30 keV. The distribution of the GT strength was obtained up to an excitation energy (Ex) of 14.2 MeV. This distribution was compared with that of the Tz=-2/3→-1/ 2 transitions studied in 37Ca β decay up to Ex=8.6 MeV. Although the overall distributions were similar, details of the fine structure were not necessarily reproduced. The experimental results were compared with a shell-model (SM) calculation using the USD interaction and the effective GT operator that compensates for the effect of limited model space. Although the overall distribution was reproduced by the SM calculation, the fragmentation of states was not reproduced. Neutrino cross sections were derived for the 8B solar-neutrino source.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics