Signature inversion in the odd-odd nuclei with mass A∼80

To understand the microscopic origin of the signature inversion in the yrast positive-parity bands of doubly odd Rb nuclei, as an example, the authors performed calculations using the projected shell model (PSM) to describe the energy spectra in 82Rb. It can be seen that the main features are reproduced in the calculations. This analysis shows clearly that the signature splitting and especially the signature inversion are reproduced only by a varying γ deformation with increasing spin. (authors)