Microscopic description of odd-mass nuclei in the mass A = 130 region

Abstract

We present a systematic study of low- and medium-spin properties of odd-mass nuclei in the mass A = 130 region using a microscopic spin- and number-conserving nuclear structure model with a realistic two-nucleon interaction. In this model the wave functions are approximated by linear combinations of number- and spin-projected one-quasiparticle determinants obtained from a selfconsistent Hartree-Fock-Bogoliubov mean field. The choice of the model space and the renormalization of the two-nucleon force extracted via a G-matrix description from nucleon-nucleon scattering data are discussed in detail. We demonstrate that the model can account for the main systematic trends of odd-mass nuclei in the region considered and is even able to reproduce rather fine details. It can hence be used to predict e.g. even such complicated level sequences as displayed here by the positive-parity neutron and proton excitations. The calculated spectroscopic amplitudes for singlenucleon transfer are compared with experiments and an extensive set of predictions is made. Throughout the paper we discuss the limitations of the presently used projected one-quasiparticle approach.