T > giant resonance in Nd 142 via the reaction Nd 142 ( e , e ′ p )

The reaction $^{142}\mathrm{Nd}(e,{e}^{\ensuremath{'}}p)^{141}\mathrm{Pr}$ has been used to study the ${T}_{g}$ giant resonance in $^{142}\mathrm{Nd}$. Cross sections for the $^{142}\mathrm{Nd}(\ensuremath{\gamma},p)^{141}\mathrm{Pr}$ and $^{142}\mathrm{Nd}(\ensuremath{\gamma},{p}_{0}+{p}_{1})^{141}\mathrm{Pr}$ reactions were measured for excitation energies from 15.9 to 26.0 MeV. These cross sections are compared with previous $^{141}\mathrm{Pr}(p,{\ensuremath{\gamma}}_{0})^{142}\mathrm{Nd}$ data. The angular distributions for the larger resonances at 17.3, 19.7, and 22.9 MeV were measured. Analysis indicates that the 22.9-MeV state has about a 13% $E2$ component. The decay proton spectra from the 19.7- and 22.9-MeV resonances were analyzed with a schematic shell model and indicates that the core excitation process is dominant in these isobaric analog resonances. The measured ($\ensuremath{\gamma},p$) cross section together with the ($\ensuremath{\gamma},n$) cross section is found to be fairly consistent with the predictions of isospin splitting theory.