On the Mechanism of Signature Inversion in the Doubly Odd Nuclei ^<80,82>Rb (Nuclear Physics)

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Several mechanisms have been proposed for signature inversion in the structure of A 〜 80 odd-odd nuclei, but the corresponding theoretical calculations have not been conclusive. In the present work, the angular momentum projected shell model (PSM) is applied to the study of the nuclei ^<80,82>Rb. The results of the calculations regarding the positive parity yrast band for the configuration πg_<9/2> ⨂ Vg_<9/2> and the negative parity yrast band for the configuration π(p_<1/2> or p_<3/2> or f_<5/2>) ⨂ Vg_<9/2> are compared with experimental data. According to the interpretation provided by the projected shell model, the signature inversion displayed in the positive parity yrast band for these nuclei is a signal of a substantial quadrupole shape change that takes place with increasing spin : The nucleus evolves from a prolate shape at low spin through a triaxial shape to an oblate shape at high spin. In addition, we specify the nuclear shapes of these two bands in these two nuclei.
理論物理学刊行会の論文
2004-05-25