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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). ? - ?. ISSN 0556-2813

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Abstract

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.

Item Type: Article
Additional Information: Copyright 2012 American Physical Society.
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 11 May 2012 12:44
Last Modified: 23 Sep 2013 19:23
URI: http://epubs.surrey.ac.uk/id/eprint/492263

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