Nuclear structure studies of the chromium isotopes: The 52, 53Cr(p, p′), 53Cr(p, p′γ), 53Cr(d, d′) and 52Cr(d, p) reactions

Abstract

The MIT-ONR electrostatic generator and the MIT multiple-gap spectrograph were used to study the level structure of 52Cr and 53Cr by means of the (p, p′), (p, p′γ), (d, d′) and (d, p) reactions with proton and deuteron bombarding energies of 7.5 MeV. A total of 14 levels in 52Cr and 26 levels in 53Cr from the (p, p′) reactions and 102 levels in 53Cr from the (d, p) reactions are reported. Angular distributions of elastic and inelastic particle groups corresponding to the first five states in 53Cr have been obtained from both the (p, p′) and (d, d′) experiments. A comparison of the angular distributions of protons from the (d, p) reactions with calculations from zero-range DWBA has yielded information on the orbital angular momentum of the transferred neutron and transition strengths for 27 levels in 53Cr up to 4.7 MeV in excitation. The deduced (d, p) strengths are compared with shell-model sum-rule limits. The experimental results from the five reactions investigated are compared with other experiments performed with higher bombarding energies. The properties of the low-lying levels in 53Cr are of particular interest and are discussed in terms of theoretical calculations based on the shell model and also the weak-coupling model.