High-resolution study of Gamow-Teller transitions in the Ti 48 (He 3,t) v 48 reaction

In this work we have studied Tz=+2→+1, Gamow-Teller (GT) transitions in the Ti48(He3,t)V48 charge-exchange reaction at 140 MeV/nucleon and 0 at the Research Center for Nuclear Physics, Osaka. From the high-resolution facility, consisting of a high-dispersion beamline and the Grand Raiden spectrometer, the spectrum had an energy resolution of 21 keV, among the best achieved. Individual GT transitions were observed and GT strength was derived for each state populated up to an excitation energy of 12 MeV. The total sum of the B(GT) strength observed in discrete states was 4.0, which is 33% of the sum-rule-limit value of 12. The results were compared with the results of shell-model calculations carried out with the GXPF1J interaction. The measured B(GT) distribution was also compared with that obtained in the (He3,t) charge-exchange reaction on Ti47. On the assumption of isospin symmetry the β spectrum of the Tz=-2 nucleus Fe48 was deduced from the observed spectrum in the Ti48(He3,t)V48 reaction and this predicted spectrum was compared with the measured one. © 2016 American Physical Society