Fe54(d, p)Fe55 Reaction and the Nuclear Structure of Ti51, Cr53, and Fe55

Abstract

Energy levels in ${\mathrm{Fe}}^{55}$ have been investigated by means of the ${\mathrm{Fe}}^{54}(d, p){\mathrm{Fe}}^{55}$ reaction using 7.8-MeV deuterons from The University of Michigan 42-in. cyclotron. Twenty-eight levels were found up to 5.4 MeV of excitation and angular distributions obtained for eighteen of them. The ${\ell }_n$ values and reduced widths were extracted from the data by means of a distorted-wave Born-approximation analysis. An attempt is made to understand the spectra of the 29-neutron nuclei ${\mathrm{Ti}}^{51}$, ${\mathrm{Cr}}^{53}$, and ${\mathrm{Fe}}^{55}$ in terms of a shell-model description involving configurations of 2, 4, or 6 ($1f_{\frac{7}{2}}$) protons and a single neutron in the $2p_{\frac{3}{2}}$, $2p_{\frac{1}{2}}$, or $1f_{\frac{5}{2}}$ orbit.