Gamow-Teller strength inNi60,62,64(n,p) reactions at 198 MeV

Low-lying GT+strength inCo64studied via thePopescu1, Bäumer2, Berg3 et al. 2007Phys. Rev. C22170View full textAdd to dashboardCite

“…This is about a factor of 8 better than what was achieved in a former 64 Ni(n, p) experiment [18], allowing now the separation of several individual states in the low excitation energy region.…”

“…12 of Ref. [18] are also shown for comparison. Because the strength for the ground-state transition as deduced from the β-decay measurement [see Eq.…”

“…(2) given in Ref. [18], which represents a parametrization as function of the beam energy and target mass. In all three distributions most of the strength is concentrated in the ground-state transition, but the shell-model calculations overestimate its value by about 50%.…”

“…The GT component contributing to this peak could, in fact, be due to contributions from the ground-state or the 453-keV level, whose angular distributions have a clear L = 0 character. The L = 2 character of the transition to the 296-keV level is of particular importance as Williams et al [18], in a previous (n, p) study on 64 Ni, deduced a possible 40% contribution of the transition to this level to the ground-state peak when determining the unit cross section [see Eq. (1)].…”

“…12 of Ref. [18] and the LSSM calculations of the GT + strength from 64 Ni to individual levels [31]. A quenching factor q = 0.74 was utilized for scaling the shell-model amplitudes.…”