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,we performed calculations using the projected shell model(PSM)to describe the energy spectra in ~(82)Rb.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 T deformation with increasing spin.