An improved microscopic core–quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations

The microscopic core–quasiparticle coupling model for odd-A nuclei with octupole correlations is extended to include the monopole, quadrupole and octupole couplings between the core and the odd nucleon, based on the framework of covariant density functional theory. The model is tested in a study of low-lying excitation spectra for the odd-A nucleus [Formula: see text]Ra. Theoretical results, e.g., the parity doublets, interband [Formula: see text] and intraband [Formula: see text], are in very good agreement with the available data. In particular, the description of signature splitting in the ground-state band has been improved. This method provides a very useful tool for a systematic study of low-energy spectra in odd-mass actinides with octupole correlations.