Observation of1+state inCa48by hadron inelastic scattering

Abstract

The 10.2 MeV state in $^{48}\mathrm{Ca}$ has been confirmed to be ${J}^{\ensuremath{\pi}}={1}^{+}$ by ($p$,${p}^{\ensuremath{'}}$) and ($\ensuremath{\alpha}$, ${\ensuremath{\alpha}}^{\ensuremath{'}}$) experiments. The state was strongly excited by the ($p$,${p}^{\ensuremath{'}}$) reaction at ${E}_{p}=65$ MeV. Differential cross sections of the state are compared with a microscopic distorted-wave Born approximation calculation based on a shell model. The calculation overestimates the cross sections by a factor of 4.NUCLEAR REACTIONS $^{48}\mathrm{Ca}$($p$,${p}^{\ensuremath{'}}$), $E=65$ MeV, $^{48}\mathrm{Ca}$($\ensuremath{\alpha}$,${\ensuremath{\alpha}}^{\ensuremath{'}}$), $E=70$ MeV; measured $\ensuremath{\sigma}(\ensuremath{\theta})$; ${J}^{\ensuremath{\pi}}={1}^{+}$ assigned for the 10.2 MeV level. Enriched target. DWBA analysis.