Calculation of Yrast Bands for Odd-Odd Nuclei 80,82Rb in A≈80 Mass Region
- Received Date: 2003-07-09
- Accepted Date: 1900-01-01
- Available Online: 2004-03-05
Abstract: Several mechanisms have been proposed for the signature inversion in the structure of A≈80 odd-odd nuclei, but the theoretical calculations have not been conclusive. In this work, the angular momentum projected shell model (PSM) is applied to the nuclei 80,82Rb. The results of theoretical calculations about the positive-parity yrast band with configuration πg9/2⊙νg9/2 and the negative-parity yrast band with configuration π(p1/2 or p3/2 or f5/2)⊙νg9/2 are compared with experimental data, especially, the mechanism of the signature inversion in the positive-parity yrast band is discussed. The interpretation within the projected shell model shows that the signature inversion displayed in the positive-parity yrast band in these nuclei is a signal of a substantial quadrupole shape change with increasing spin where the nucleus evolves from a prolate shape at low spin through a triaxial shape to an oblate shape at high spin. In addition, we also specify the nuclear shape for these two bands in these two unclei, respectively.