Experimental High-Resolution Investigation and Shell-Model Interpretation of theCa49Ground-State Analog

Abstract

Excitation functions for ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}\mathrm{}(p,p)\mathrm{}$ at 165° and 105° have been measured from 1.93 to 2.01 MeV.Inaddition, the reactions ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}\mathrm{}(p,n)\mathrm{}{}_{}{}^{48}{}_{}{}^{}\mathrm{Sc}$ and ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}(p,n\gamma ){}_{}{}^{48}{}_{}{}^{}\mathrm{Sc}$ have been observed. Spins, parities, total and partial widths have been assigned. Eleven resonances are observed, eight of which have $J^{\pi }={\frac{3}{2}}^{-}$ and are associated with the ${}_{}{}^{49}{}_{}{}^{}\mathrm{Ca}$ ground-state analog. These ${\frac{3}{2}}^{-}$ levels are interpreted in terms of a detailed shell-model calculation. The importance of $4p-3h$ and higher configurations is noted.