Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a 208Pb beam

S. J. Steer et al.
Phys. Rev. C 84, 044313 – Published 14 October 2011

Abstract

Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV 20882Pb beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed γ rays, isomeric decays associated with these nuclei have been identified. A total of 49 isomers were detected, with the majority of them observed for the first time. The newly discovered isomers are in 204,20580Hg, 201,202,204,20579Au, 197,203,20478Pt, 195,19920377Ir, 193,19719976Os, 19675Re, 190,19174W, and 18973Ta. Possible level schemes are constructed and the structure of the nuclei discussed. To aid the interpretation, shell-model as well as BCS calculations were performed.

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  • Received 2 August 2011

DOI:https://doi.org/10.1103/PhysRevC.84.044313

©2011 American Physical Society

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Vol. 84, Iss. 4 — October 2011

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