Eur. Phys. J. A (2006) 30: 343-346
https://doi.org/10.1140/epja/i2006-10141-6

Letter

A simple model for doublet bands in doubly odd nuclei

¹ Department of Physics, Saitama University, 338-8570, Saitama City, Japan
² Department of Physics, Chiba Institute of Technology, 275-0023, Narashino, Chiba, Japan
³ Department of Physics, University of Tokyo, 113-0033, Hongo, Tokyo, Japan

Received: 10 August 2006
Accepted: 30 October 2006
Published online: 15 November 2006

Abstract

Nuclear structure of doublet bands in doubly odd nuclei with mass A ∼ 130 is investigated within the framework of a simple model where the even-even core couples with a neutron and a proton in intruder orbitals through a quadrupole-quadrupole interaction. The model reproduces quite well the energy levels of doublet bands and electromagnetic transitions. The staggering of the ratios B(M1;I → I - 1)/B(E2;I → I - 2) of the yrast bands turns out to be described by the chopsticks-like motion of two angular momenta of the unpaired neutron and the unpaired proton when they are weakly coupled with the core.-1