Inelastically scattered proton spectra from targets of natural chromium and targets enriched in ${\mathrm{Cr}}^{50}$, ${\mathrm{Cr}}^{53}$, and ${\mathrm{Cr}}^{54}$ have been studied for bombarding energies in the region of 4.3 to 4.6 Mev using a doublefocusing magnetic spectrometer, at angles of observation of 91.5\ifmmode^\circ\else\textdegree\fi{} and 136.2\ifmmode^\circ\else\textdegree\fi{}. The enriched targets were prepared by the vacuum evaporation of ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ from a small carbon crucible mounted on a tungsten filament onto gold-leaf backings. Surveys were taken up to at least 2.0-Mev excitation. The following level energies in kev were determined: ${\mathrm{Cr}}^{50}$, 780\ifmmode\pm\else\textpm\fi{}3; ${\mathrm{Cr}}^{52}$, 1432\ifmmode\pm\else\textpm\fi{}5; ${\mathrm{Cr}}^{53}$, 562\ifmmode\pm\else\textpm\fi{}3, 1006\ifmmode\pm\else\textpm\fi{}4, and 1287\ifmmode\pm\else\textpm\fi{}5; ${\mathrm{Cr}}^{54}$, 842\ifmmode\pm\else\textpm\fi{}6. The new level in ${\mathrm{Cr}}^{50}$ occurs at the energy expected for the first 2+ state. Inelastically scattered proton groups corresponding to the known second excited states of ${\mathrm{Cr}}^{52}$ and ${\mathrm{Cr}}^{54}$ were not of sufficient intensity to be observed.

Nuclear reaction energies have been measured by using a 180\ifmmode^\circ\else\textdegree\fi{} double-focusing magnetic spectrometer. In order to test the reliability of the energy calibration of the spectrometer, two ${\mathrm{Al}}^{27}(p, \ensuremath{\alpha}){\mathrm{Mg}}^{24}$ groups were observed, with measured $Q$ values of 1.596\ifmmode\pm\else\textpm\fi{}0.006 and 0.230\ifmmode\pm\else\textpm\fi{}0.005 Mev, corresponding to the ground state of ${\mathrm{Mg}}^{24}$ and the first excited state at 1.366\ifmmode\pm\else\textpm\fi{}0.006 Mev. A further check was provided by the observation of six ${\mathrm{Al}}^{27}(p, {p}^{\ensuremath{'}}){\mathrm{Al}}^{27}$ inelastic groups, corresponding to ${\mathrm{Al}}^{27}$ levels at 0.842\ifmmode\pm\else\textpm\fi{}0.003, 1.013\ifmmode\pm\else\textpm\fi{}0.003, 2.205\ifmmode\pm\else\textpm\fi{}0.004, 2.727\ifmmode\pm\else\textpm\fi{}0.004, 2.975\ifmmode\pm\else\textpm\fi{}0.004, and 2.998\ifmmode\pm\else\textpm\fi{}0.004 Mev. In view of the good agreement of these results with previous measurements, the ground-state $Q$ values of the ${\mathrm{Cl}}^{35}(p, \ensuremath{\alpha}){\mathrm{S}}^{32}$ and ${\mathrm{Cl}}^{37}(p, \ensuremath{\alpha}){\mathrm{S}}^{34}$ reactions have been remeasured as 1.860\ifmmode\pm\else\textpm\fi{}0.005 and 3.028\ifmmode\pm\else\textpm\fi{}0.006 Mev.

Inelastic proton spectra from targets containing phosphorus and zinc have been studied at bombarding energies of 3.72 and 4.66 Mev using a double-focusing spectrometer. Proton groups have been observed corresponding to levels in ${\mathrm{P}}^{31}$ at 1.264\ifmmode\pm\else\textpm\fi{}0.004, 2.230\ifmmode\pm\else\textpm\fi{}0.005, 3.134\ifmmode\pm\else\textpm\fi{}0.006, and 3.292\ifmmode\pm\else\textpm\fi{}0.005 Mev. Excitation curves for these four inelastic groups measured in the region of ${E}_{p}=4.55 \mathrm{to} 4.70$ Mev show the same general resonant structure, although differing in detail. At ${E}_{p}=4.66$ Mev, no additional groups from ${\mathrm{P}}^{31}$ were observed for the excitation region 0 to 1.26 Mev with an intensity greater than 2% of the intensity of the first excited state group.Four inelastic proton groups were observed from zinc. From a comparison with the known level schemes of the zinc isotopes, three of these groups were assigned to the following isotopes: ${\mathrm{Zn}}^{64}$, 0.991\ifmmode\pm\else\textpm\fi{}0.005 Mev; ${\mathrm{Zn}}^{66}$, 1.038\ifmmode\pm\else\textpm\fi{}0.005 Mev; and ${\mathrm{Zn}}^{68}$, 1.078\ifmmode\pm\else\textpm\fi{}0.005 Mev. The remaining group with $Q=\ensuremath{-}1.802\ifmmode\pm\else\textpm\fi{}0.005$ Mev remains unassigned.

Inelastic scattering of neutrons has been used to study excited states in ${\mathrm{Rh}}^{103}$ and ${\mathrm{Nb}}^{93}$. Gamma rays have been observed from the 300- and 365-kev levels in Rh. Gamma rays of 736- and 957-kev energy have been obtained from Nb. As a result of threshold measurements, these gamma rays are interpreted as representing transitions to the 29-kev metastable state from levels at 764- and 977-kev in Nb.