The Elastic Scattering of Protons by Lithium

Abstract

The cross section for the reaction ${\mathrm{Li}}^7(p, p)$ has been measured over the proton energy range 360-1400 kev. Measurements were made at scattering angles of 50, 70, 89.2, 110, 130, 143.4, and 160 degrees in the center-of-mass system. Anomalous scattering was observed near 441.5 kev, the resonance energy for the reaction ${\mathrm{Li}}^7(p, \gamma )$, and near 1030 kev, the resonance energy for the reaction ${\mathrm{Li}}^7(p, p^{\prime })$. Analysis of the results at 441.5 kev indicates a state in ${\mathrm{Be}}^8$ with $J=1\mathrm{}$, even parity, formed by $p$ wave protons. The relative stopping cross section for protons in lithium was also measured from 200-1300 kev.