Abstract
Nine angular distributions of the neutron polarization produced in the (ground-state) reaction were determined for energies from 2.24 to 3.70 MeV. High polarizations were found at all energies, the extreme values being -0.87 at 2.39 MeV and 50°, and +0.72 at 3.70 MeV and 40°. Below 3.2 MeV, the neutron yield at 0° and the differential cross sections exhibit compound-nuclear effects. Above this energy, the 0° yield curve is structureless, and the cross section shows pronounced , diproton stripping patterns. Also, the three polarization distributions between 3.30 and 3.70 MeV are similar. An attempt was made to fit the 3.70-MeV () cross section and neutron polarization distributions with a distorted-wave Born-approximation (DWBA) analysis. Prior to this analysis, elastic-scattering data were obtained over the region from 3.6 to 3.8 MeV, and optical-model parameters for the incident channel were extracted. Considering the possible compound-nuclear effects which were neglected in the fitting procedure, reasonable results were achieved with the DWBA code. One striking result was that the predicted polarization is insensitive to the spin-orbit strength.
- Received 19 May 1967
DOI:https://doi.org/10.1103/PhysRev.163.1034
©1967 American Physical Society