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Application of a quadrupole-coupling model to doublet bands in doubly-odd nuclei

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Abstract.

A simple model is applied to the yrast and yrare states based on the νh 11/2 ⊗ πh 11/2 configuration in the doubly-odd nuclei around the mass 130. In the model, the basis state is constructed by one neutron and one proton both in the 0h 11/2 orbital, and by the collective core which couples with the two particles through a quadrupole interaction. The model reproduces quite well the overall energy levels and the electromagnetic transitions. The analysis of the yrast and yrare states reveals that the angular-momentum configuration of the neutron and the proton in the yrast states is different from that in the yrare states, when the two particles are weakly coupled with the quadrupole collective excitations of the core. The strong even-odd staggering of the ratios B(M1;I → I - 1)/B(E2;I → I - 2) for the yrast states is described by the chopsticks-like motion of two angular momenta of the neutron and the proton.

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Authors and Affiliations

  1. Department of Physics, Chiba Institute of Technology, 275-0023, Narashino, Chiba, Japan

    K. Higashiyama

  2. Department of Physics, Saitama University, 338-8570, Saitama City, Japan

    N. Yoshinaga

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  1. K. Higashiyama
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Higashiyama, K., Yoshinaga, N. Application of a quadrupole-coupling model to doublet bands in doubly-odd nuclei. Eur. Phys. J. A 33, 355–374 (2007). https://doi.org/10.1140/epja/i2007-10457-7

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