Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter gR
University of Tennessee, Department of Physics and Astronomy Knoxville, TN 37996, USA and Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom
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Published online: 19 December 2013
Using the principle of additivity, the quasi-particle contribution to magnetism in high-K isomers of Lu - Re has been estimated. Based on these estimates band structure branching ratio data is used to explore the behavior of the collective contribution as the number and neutron/proton nature (Np, Nn), of the quasi-particle excitations, change. A striking systematic variation of the collective g-factor gR with the difference, Np – Nn, is revealed. Basic ideas of pairing, its quenching by quasi-particle excitation and the consequent changes to moment of inertia and collective magnetism are discussed. The new found systematic behaviour of gR opens a fresh window on these effects amenable to detailed theoretical investigation.
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