Levels ofMn53from theCr53(p, nγ)Mn53Reactions

In a study of the ${}_{}{}^{53}{}_{}{}^{}\mathrm{Cr}(p, n\gamma ){}_{}{}^{53}{}_{}{}^{}\mathrm{Mn}$ reactions, levels of ${}_{}{}^{53}{}_{}{}^{}\mathrm{Mn}$ have been found at 377.5, 1288.4, 1440.1, and 1619.1 keV, with uncertainties of ±0.3 keV. The observation of $\gamma$-ray anisotropies and ($p, n$) cross-section ratios permits unique spin assignments to three of the levels. Analysis of the ($p, n$) cross-section ratios using the Hauser-Feshbach formalism is consistent with the results of earlier experiments for the two lower levels. The spins of the above levels are, in the order given above, $\frac{5}{2}$, $\frac{3}{2}$, $\frac{11}{2}$, and $\frac{9}{2}$. Mixing ratios for the 377.5- and 1619.1-keV transitions are measured to be -0.6±0.3 and -3.2±0.8, respectively.