Study ofCr49Using theCr50(He3,α)Cr49Reaction andCr50(He3,αγ)Cr49Angular Correlations

Energy levels in ${}_{}{}^{49}{}_{}{}^{}\mathrm{Cr}$ have been studied using the ${}_{}{}^{50}{}_{}{}^{}\mathrm{Cr}({}_{}{}^3{}_{}{}^{}\mathrm{He},\alpha ){}_{}{}^{49}{}_{}{}^{}\mathrm{Cr}$ reaction. Angular distributions of $\alpha$ particles were measured and compared with distorted-wave Born-approximation calculations to determine $l$ values. $\alpha -\gamma$ angular correlations were also measured. The following spin-parity assignments are consistent with our results for the levels indicated: 0.27 MeV ${\frac{7}{2}}^{-}$, 1.07 MeV (${\frac{5}{2}}^{-},{\frac{9}{2}}^{-}$), 1.57 MeV (${\frac{5}{2}}^{-},{\frac{7}{2}}^{-},{\frac{11}{2}}^{-}$), 1.71 MeV (${\frac{1}{2}}^{-},{\frac{3}{2}}^{-}$), 1.74 MeV ${\frac{3}{2}}^{-}$, 1.98 MeV ${\frac{3}{2}}^{-}$, 2.43 MeV ${\frac{5}{2}}^{-}$, 2.58 MeV ${\frac{1}{2}}^{+}$, 2.61 MeV ${\frac{3}{2}}^{-}$, 3.24 MeV ${\frac{5}{2}}^{-}$, 3.51 MeV (${\frac{5}{2}}^{-},{\frac{7}{2}}^{-}$), 3.93 MeV ${\frac{1}{2}}^{-}$, 4.76 MeV ${\frac{7}{2}}^{-}$, 5.57 MeV ${\frac{3}{2}}^{+}$, 6.43 MeV ${\frac{1}{2}}^{+}$, 6.47 MeV ${\frac{1}{2}}^{+}$, 6.76 MeV ${\frac{1}{2}}^{+}$. Branching ratios for the decays of these levels were measured. Multipole mixing ratios were extracted from the correlation data.