Cross Sections for Nuclear Reactions Involving Nuclear Isomers

Abstract

Cross sections for the reactions ${\mathrm{Cr}}^{52}(p, n){\mathrm{Mn}}^{52m}$, ${\mathrm{Cr}}^{52}(p, n){\mathrm{Mn}}^{52}$, ${\mathrm{Ag}}^{107}(p, pn){\mathrm{Ag}}^{106m}$, ${\mathrm{Ag}}^{107}(p, pn){\mathrm{Ag}}^{106}$, and ${\mathrm{Cu}}^{63}(p, n){\mathrm{Zn}}^{63}$ were determined as a function of energy with the 20.6-Mev proton beam of the U.C.L.A. synchrocyclotron. The relative yields of ${\mathrm{Sr}}^{85}$, ${\mathrm{Sr}}^{85m}$, and ${\mathrm{Sr}}^{87m}$ obtained in the proton bombardment of rubidium were also determined. In all cases the isomer yield ratios varied with energy over the entire energy range studied. The results are discussed in terms of conservation of angular momentum, assuming compound nucleus formation.