The yields of the (p,γ) and (p,p’γ) reactions on ${}_{}{}^{50}{}_{}{}^{}\mathrm{Cr}$ were measured in the proton energy range 1.7 to 2.5 MeV with an energy resolution <2 keV. In all, 72 resonances were found, mostly in both channels. Nine resonances, at 1.936, 1.942, 2.030, 2.042, 2.113, 2.141, 2.187, 2.303, and 2.408 MeV were determined to be close multiplets. Gamma-ray spectra were measured at 53 resonances, including the multiplets. Angular distributions of the capture γ transitions at 40 resonances and of the $2^{+}$→$0^{+}$ γ transition in ${}_{}{}^{50}{}_{}{}^{}\mathrm{Cr}$ at 27 resonances were measured. The gamma decay schemes of the resonances provided information on 43 excited states of ${}_{}{}^{51}{}_{}{}^{}\mathrm{Mn}$ up to 5.174 MeV. Bound levels at 3.029, 3.835, 3.877, 3.955, 4.006, 4.046, and 4.153 MeV were populated for the first time in the (p,γ) reaction and their decay schemes were determined. Significant revisions of the decay schemes of the 2.276, 2.702, 2.893, 3.131, 3.292, 4.450, 4.540, 5.074, 5.129, and 5.174 MeV levels have resulted from the large number of resonances studied. Spins and parities for many resonances and bound states of ${}_{}{}^{51}{}_{}{}^{}\mathrm{Mn}$ have been determined from an extensive set of angular distribution measurements. In the proton energy range studied, 13 resonances are proposed as isobaric analogs of excited states from 2.704 to 3.207 MeV in ${}_{}{}^{51}{}_{}{}^{}\mathrm{Cr}$.

• Received 6 August 1985

DOI:https://doi.org/10.1103/PhysRevC.33.103