Abstract
The (n,pB reaction has been studied at 60 and 65 MeV. Cross sections for the ground state, the first excited state at 0.95 MeV, an unresolved pair of and states at 4.4 MeV, and the analogs of the giant electric dipole and spin-dipole resonances around 7.7 MeV have been extracted and compared with previous data at 56 MeV and with microscopic distorted-wave Born approximation calculations. The shapes of angular distributions out to q∼2 are well reproduced by the calculations. A comparison of (n,p), (p,n), and (p,p’) cross sections near 60 MeV is made, and a value for ‖‖ (the volume integral of the central, spin-isospin part of the effective nucleon-nucleon interaction) is extracted. The magnitudes of cross sections for negative-parity states can be qualitatively understood when the loose binding of the sd-shell neutron in the final state and the effect of ground-state correlations on the dipole and spin-dipole strengths are taken into account.
- Received 13 April 1990
DOI:https://doi.org/10.1103/PhysRevC.43.2284
©1991 American Physical Society