Angular Distributions of the Recoil Nuclei from theCu65(p, pn)Cu64Reaction at 0.37, 1.0 and 2.8 GeV

Abstract

Angular distributions of the recoil nuclei from the ${\mathrm{Cu}}^{65}(p, pn){\mathrm{Cu}}^{64}$ reaction at incident proton energies of 0.37, 1.0, and 2.8 GeV were measured, and each was found to consist of a narrow sidewise peak on a gently sloping background. The most probable angle increases from 75° at 0.37 GeV to 85° at 2.8 GeV. The peaks are interpreted as resulting from a mechanism of inelastic scattering followed by neutron evaporation. They are thus taken to support the concept that the various mechanisms for nucleon, 2-nucleon reactions contribute independently, without interference, to the total cross sections for these reactions. The cross section in the peak was found to be about 0.3 of the total cross section at each of the three energies.