Abstract
The differential elastic scattering cross section for protons from nuclei has been measured for proton energies from 0.45 to 2.9 MeV at six different angles. The scattering data are consistent with an - and -wave phase shift analysis, assuming a single -wave state to be present at about MeV, with resonance parameters similar to the parameters previously assigned to the corresponding level in , and a very broad -wave state at higher energy. It is also possible to fit the scattering and reaction data with a -wave state and a different choice of -wave background. A -wave state is not consistent with the data. No evidence has been found for the existence of a previously reported state near MeV. Removal of the simplifying assumption that only one -wave state is participating would probably lead to different conclusions about the nature of the -wave scattering. The relative stopping cross section for protons in lithium was also measured and found to follow the Bloch formula from 0.8 to 2.8 MeV.
- Received 31 January 1963
DOI:https://doi.org/10.1103/PhysRev.130.2034
©1963 American Physical Society