Absolute cross sections for theNi58,60(O16,X)reactions

Abstract

The absolute cross sections for a variety of reactions resulting from bombardment of ${}_{}{}^{58,60}{}_{}{}^{}\mathrm{Ni}$ with 38-, 42-, and 46-MeV ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ions were determined from yields of $\gamma$ rays observed from the decay of resulting radioactivities and from yields of in-beam $\gamma$ rays. The strongest reactions are (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},pn$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},2p$), and (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},\alpha p$). Other identified reactions are (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},p$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},2n$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},\alpha$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},\alpha n$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},2\mathrm{}\alpha$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},2\mathrm{pn}$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},3p$), (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},{}_{}{}^{12}{}_{}{}^{}\mathrm{C}$), and (${}_{}{}^{16}{}_{}{}^{}\mathrm{O},{}_{}{}^{15}{}_{}{}^{}\mathrm{N}$). At the higher projectile energies the total cross sections are in reasonable agreement with the reaction cross sections based on an optical-model calculation. The relative yields of the reaction products were compared to predictions for statistical decay of a compound-nuclear system by neutron, proton, and $\alpha$-particle emission. This model does account for the general features of the experimental data; in particular it correctly predicts that charged-particle emission strongly competes with neutron emission.