Abstract
Angular distributions for elastic and inelastic scattering of ∼ 50 MeV projectiles from targets of , , Si, and Fe are reported. Systematic differences between the experimental results and predictions of some first-order theories constructed from free amplitudes are observed for all cases studied. These discrepancies are similar to those reported earlier. Although several improved optical models exist which take into account better treatments of the first-order potential as well as some second-order effects such as absorption and the Lorentz-Lorentz effect, good agreement with the data cannot be achieved without a phenomenological adjustment of the potential parameters. A purely phenomenological Kisslinger potential when used to fit the data yields potential parameters which are independent of mass number over the region studied. The resulting -wave parameter is close to the value predicted from free models, while the -wave parameter requires severe adjustment of both real and imaginary parts from the value predicted from free models. The inelastic results are compared to distorted-wave Born-approximation calculations, which are seen to manifest characteristics similar to those seen in the elastic channel. A common optical potential is found to provide a good description of both elastic and inelastic scattering.
NUCLEAR REACTIONS Elastic and inelastic scattering of 50 MeV from , , Si and Fe. Angular distributions: . Optical model and DWBA of cross-section data.
- Received 12 June 1978
DOI:https://doi.org/10.1103/PhysRevC.19.971
©1979 American Physical Society