Residual interactions and the K-mixing-induced fast decay of the three-quasiparticle isomer in Tm-171
Chen, F-Q, Liu, Y-X, Sun, Y, Walker, PM and Dracoulis, GD (2012) Residual interactions and the K-mixing-induced fast decay of the three-quasiparticle isomer in Tm-171 Physical Review C (Nuclear Physics), 85 (2), 024324.
12_tm171-fnu-calc_preprint.pdf - Accepted version Manuscript
Available under License : See the attached licence file.
The anomalously fast decay of a 19/2+ three-quasiparticle isomer in 171Tm was interpreted recently as an example of K mixing induced by a very small mixing matrix element but a (random) close proximity to a collective state. To understand the source of the residual interaction we have generalized the projected shell model by introducing two-body octupole and hexadecupole forces into the Hamiltonian and expanding the model space with inclusion of specific three-quasiparticle configurations. It is found that the K mixing is built up from small interactions transferred through numerous highly excited configurations that contain high-j orbitals. While the chance near-degeneracy enhances the transition strength, the octupole correlation and Coriolis coupling produce the mixing matrix element.
|Divisions :||Faculty of Engineering and Physical Sciences > Physics|
|Identification Number :||10.1103/PhysRevC.85.024324|
|Related URLs :|
|Additional Information :||Copyright 2012 American Physical Society.|
|Depositing User :||Symplectic Elements|
|Date Deposited :||11 May 2012 12:44|
|Last Modified :||23 Sep 2013 19:23|
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