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Phys. Rev. C 75, 014302 (2007) [18 pages]

Investigation of nuclear collectivity in the neutron mid-shell nucleus 186Pb

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J. Pakarinen1,2,*, V. Hellemans3, R. Julin1, S. Juutinen1, K. Heyde3, P.-H. Heenen4, M. Bender5, I. G. Darby2, S. Eeckhaudt1, T. Enqvist1,†, T. Grahn1, P. T. Greenlees1, F. Johnston-Theasby6, P. Jones1, H. Kettunen1, M. Leino1, A.-P. Leppänen1,‡, P. Nieminen1,§, M. Nyman1, R. D. Page2, P. M. Raddon6, P. Rahkila1, C. Scholey1, J. Uusitalo1, and R. Wadsworth6
1Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
2Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
3Department of Subatomic and Radiation Physics, Proeftuinstraat, 86 B-9000 Gent, Belgium
4Dapnia/SPhN, CEA Saclay, F-91191 Gif sur Yvette Cedex, France
5Department de Physique Nucléaire Théorique, Université Libre de Bruxelles, Case Postale 229, B-1050 Bruxelles, Belgium
6Department of Physics, University of York, Heslington, York Y01 5DD, United Kingdom

Received 17 July 2006; published 3 January 2007

For the first time, non-yrast structures of the neutron mid-shell nucleus 186Pb have been identified in an in-beam γ-ray spectroscopy measurement using the recoil-decay tagging technique. The yrast band has been tentatively extended up to Iπ=20+, revealing a similar backbend to that observed in the Pt and Hg isotones. Three new bands and several other transitions have been observed. Calculations carried out in the framework of the interacting boson model together with mean-field studies using the generator coordinate method provide arguments for the association of one of the new bands with an oblate shape. The present data also show evidence for octupole and γ-vibrational bands.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.75.014302
DOI:
10.1103/PhysRevC.75.014302
PACS:
27.70.+q, 21.10.Re, 23.20.Lv, 25.70.Gh

*E-mail enquiries: jp@ns.ph.liv.ac.uk

†Present address: Centre for Underground Physics, P.O. Box 22, FI-86801, Pyhäsalmi, Finland.

‡Present address: Northern Finland Regional Laboratory, STUK-Radiation and Nuclear Safety Authority, Rovaniemi, Finland.

§Present address: Department of Nuclear Physics, The Australian National University, Canberra, ACT 0200, Australia.

 
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