Absolute Reaction Cross Section of the ReactionV51(p,n)Cr51Over the Isobaric Analog Resonance near 2.340 MeV

The shape of the isobaric analog resonance near 2.340 MeV in the reaction ${}_{}{}^{51}{}_{}{}^{}\mathrm{V}\mathrm{}(p,n)\mathrm{}{}_{}{}^{51}{}_{}{}^{}\mathrm{Cr}$ has been determined with fine resolution (∼1 keV) utilizing a $4\pi$ geometry neutron counter. It is shown that a negative value for the level-shift parameter $\Delta$ of the isobaric-analog-resonance theory is required to fit the data. The spectroscopic factor for the analog state at 12.8 MeV corresponding to this resonance is estimated to be 0.75 ± 0.15.