The 48Ca(3He,t)48Sc reaction at 66 and 70 MeV-reaction mechanism and Gamow-Teller strength

The 48Ca(3He,t)48Sc reaction has been studied at Esub(3He) = 66 MeV and 70 MeV. Angular distributions are given from theta = 80 to 350. The 0+-7+ multiplet in 48Sc is strongly excited at these energies and the spectra are further characterized by some broad structures on a continuous background. Broad peaks at Esub(ex) = 7.8, 10.6 and 13.3 MeV have an angular distribution similar to the low-lying 1+ state. The broad peaks are interpreted as envelopes of groups of 1+ states carrying a significant part of the Gamow-Teller strength. The strength distribution is consistent with a shell-model calculation. The reaction mechanism has been examined at 66 MeV. The cross section is calculated for the 0+-7+ multiplet in 48Sc as a coherent sum of one-step and two-step processes. The two-step contribution is calculated in a full finite-range 2nd-order DWBA. The result is similar contributions from (3He,α,t) and (3He,d,t). The calculations account reasonably well for the data with the exception of the transition to 08, IAS. (orig.)