Excited analogs in Ni62 and Cu63(p, n) and the weak-coupling model

The ground- and 2+ excited-state analog cross sections in Ni62(p, n) have been measured at bombarding energies of 16, 19, and 22 MeV. The measurements at 19 and 22 MeV confirm the weak coupling and Thankappan-True prediction of ∼ 0.4 for the fractionation of the 2+ strength into the 72- excited analog transition in Cu63(p, n). At 16 MeV, agreement with the weak-coupling model is poor. The discrepancy is possibly due to a preequilibrium contribution to the 72- excited analog transition in Cu63(p, n). NUCLEAR REACTIONS Ni62(p, n), E=16, 19, 22 MeV; measured σ(θ) ground-state and 2+ excited-state analog; calculated σ(θ) 2+ using weak-coupling model.