Total cross sections for the ${}_{}{}^{151,153}{}_{}{}^{}\mathrm{Eu}$(p,n${)}^{151,153}$Gd reactions have been measured between 5 and 12 MeV. We observe a significant (≤35%) enhancement of the cross sections for ${}_{}{}^{153}{}_{}{}^{}\mathrm{Eu}$ relative to ${}_{}{}^{151}{}_{}{}^{}\mathrm{Eu}$ and find that the enhancement below ∼10 MeV is due largely to the shape difference between ${}_{}{}^{151}{}_{}{}^{}\mathrm{Eu}$(${\mathrm{\beta }}_2$=0.13) and ${}_{}{}^{153}{}_{}{}^{}\mathrm{Eu}$(${\mathrm{\beta }}_2$=0.28).

• Received 9 April 1990

DOI:https://doi.org/10.1103/PhysRevC.42.R479