Abstract
The neutron elastic and inelastic scattering double-differential cross sections of were measured at incident neutron energies of 11.5, 14.1, and 18.0 MeV. A phenomenological neutron optical model potential of was constructed to describe the total and elastic scattering cross sections from 5 MeV to several tens MeV, based on the present data together with information from other works. This potential was found to describe the inelastic scattering to the first excited state well via the distorted-wave Born approximation (DWBA) calculation with the macroscopic vibrational model. The continuum neutron energy spectra and angular distributions were then analyzed by the theory of final-state interaction extended to the DWBA form, with an assumption that the interaction is dominant in the three-body final state consisting of and α particles. Such a calculation was found to be successful in explaining the major part of the low-excitation neutron spectra and angular distribution down to the Q-value region of except for the Q-value range where the quasifree scattering will give a non-negligible contribution at forward angles.
- Received 8 May 1998
DOI:https://doi.org/10.1103/PhysRevC.58.2205
©1998 American Physical Society