Excited states of the odd-odd nucleus230Pa

Abstract

The completely unknown spectrum of excited states of the odd-odd nucleus ${}^{230}$Pa was studied employing the one-neutron transfer reaction ${}^{231}$Pa($d,t$)${}^{230}$Pa at a beam energy of 22 MeV. The excitation energy and the cross section were measured for, in total, 81 states below 1.4 MeV. Level assignments of these states are based on a semiempirical model and comparison with theoretical predictions, based on distorted-wave Born approximation (DWBA) calculations for the cross sections. For 12 rotational bands the band-head energy and the rotational parameter are determined. The $K$ quantum numbers and the Nilsson configurations are established. Empirical values for the Gallagher-Moszkowski splittings and for Newby shifts are obtained.