Protons from Alpha-Induced Reactions

The results of proton energy spectra measured at several angles from 30.5-Mev alpha particle induced reactions on Al²⁷, V⁵¹, Co⁵⁹, As⁷⁵, Nb⁹³, Rh¹⁰³, In¹¹⁵, and Ta¹⁸¹ were analyzed using the statistical model. The analysis yielded the differential cross section d²σdΩdE and the relative level density ω(E) of the residual nucleus as a function of proton and excitation energy of the residual nucleus. The nuclear temperature 1/T≡d(lnω)dE and the level density parameter a of ω=Cexp[(aE)1/2] were obtained. The energy and angular dependence of the spectra are adequately described by the statistical model at back angles, with the indication of the presence of a direct-reaction mechanism contribution at forward angles, which extends to high excitation energies.