Gamma rays excited by inelastic neutron scattering in Mn55 have been studied. Coincidence methods have been used to observe those gamma rays which cascade through the 127 keV first excited state. Branching ratios have been measured for four levels, as well as the cross sections for excitation of each level. Theoretical calculations of the cross section, using a diffuse-edge potential well, give good agreement with the experiment, if appropriate spin values are assigned to each level.

Study of gamma ray spectra following inelastic neutron scattering in Nb93 has been made at bombarding energies ranging from 0.81 to 2.25 MeV. Measurement of thresholds for the gamma rays and the gamma-gamma coincidence spectra has enabled us to work out a level scheme for Nb93. The energies of the two levels previously reported have been revised to 0.741 and 0.958 MeV. In addition, levels have been found at 0.809, 1.08, 1.28, 1.34, 1.48, 1.67 and 1.92 MeV. In all, fourteen gamma-ray transitions have been detected andthe possibility of a few more is indicated. In suitable cases, branching ratios have been calculated. Gamma ray production cross-sections have also been tabulated. Theoretical calculations of the cross sections for the first five levels, using a diffuse-edge potential well, give fairly good agreement with the experiment. Probable spin assignments for the second to fifth excited states have been discussed.