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Quasi-particle and collective magnetism: Rotation, pairing and blocking in high-K isomers

Stone, NJ, Stone, JR, Bingham, CR and Walker, PM (2013) Quasi-particle and collective magnetism: Rotation, pairing and blocking in high-K isomers Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 726 (4-5). pp. 675-679.

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Abstract

For the first time, a wide range of collective magnetic g-factors g, obtained from a novel analysis of experimental data for multi-quasi-particle configurations in high-K isomers, is shown to exhibit a striking systematic variation with the relative number of proton and neutron quasi-particles, N-N. Using the principle of additivity, the quasi-particle contribution to magnetism in high-K isomers of Lu-Re, Z=71-75, has been estimated. Based on these estimates, band-structure branching ratio data are used to explore the behavior of the collective contribution as the number and proton/neutron nature (N, N), of the quasi-particle excitations, change. Basic ideas of pairing, its quenching by quasi-particle excitation and the consequent changes to moment of inertia and collective magnetism are discussed. Existing model calculations do not reproduce the observed g variation adequately. The paired superfluid system of nucleons in these nuclei, and their excitations, present properties of general physics interest. The new-found systematic behavior of g in multi-quasi-particle excitations of this unique system, showing variation from close to zero for multi-neutron states to above 0.5 for multi-proton states, opens a fresh window on these effects and raises the important question of just which nucleons contribute to the 'collective' properties of these nuclei. © 2013 Elsevier B.V.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Stone, NJUNSPECIFIEDUNSPECIFIED
Stone, JRUNSPECIFIEDUNSPECIFIED
Bingham, CRUNSPECIFIEDUNSPECIFIED
Walker, PMUNSPECIFIEDUNSPECIFIED
Date : 2013
Identification Number : 10.1016/j.physletb.2013.09.016
Additional Information : NOTICE: this is the author’s version of a work that was accepted for publication in 'Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics'. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 726, 2013, DOI 10.1016/j.physletb.2013.09.016.
Depositing User : Symplectic Elements
Date Deposited : 11 Dec 2013 09:17
Last Modified : 09 Jun 2014 13:48
URI: http://epubs.surrey.ac.uk/id/eprint/804644

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