Measurement of the Spins of Some States inFe55

The $p-\gamma$ angular correlations in the reaction ${\mathrm{Fe}}^{54}(d, p\gamma ){\mathrm{Fe}}^{55*}$ have been measured for several proton groups. The groups chosen correspond to states for which the proton angular distribution shows formation by $l=1\mathrm{}$ neutron capture. These states must therefore have spins ${\mathrm{½}}^{-}$ or ${\frac{3}{2}}^{-}$. A state with spin ${\mathrm{½}}^{-}$ must exhibit an isotropic angular correlation while a state of spin ${\frac{3}{2}}^{-}$ will ordinarily show some anisotropy. The results indicate spin ${\mathrm{½}}^{-}$ for the first excited state of ${\mathrm{Fe}}^{55}$ at 413 keV, and spin ${\frac{3}{2}}^{-}$ for states at 2.490-, 3.556-, and 3.800-MeV excitation. The conclusions are compared with previous results and with theoretical predictions.