Sub-Coulomb proton absorption for isotopes of zirconium and molybdenum

Abstract

Total ($p$,$n$) cross sections were measured with enriched targets of $^{92,94}\mathrm{Zr}$ and $^{94,95,96,98}\mathrm{Mo}$, from each threshold energy to \ensuremath{\sim}6.7 MeV. Proton strength functions were deduced and compared with those of neighboring nuclei. The strength functions were characterized by a minimum which was interpreted as a valley between the $3s$ and $3p$ single-particle resonances. Optical-model calculations were performed to fit the deduced strength functions. Systematic variations in the depths of the absorptive potentials were found as a function of mass in the manner suggested by Johnson et al.NUCLEAR REACTIONS $^{92,94}\mathrm{Zr}$ $^{94,95,96,98}\mathrm{Mo}$($p$,$n$) ${E}_{p}=1.7\ensuremath{-}6.7$ MeV; measured total $\ensuremath{\sigma}(E)$. Deduced proton strength functions. Optical-model analysis, deduced absorptive potential well depths.