High-spin collective structures in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>178</mn></mrow></msup></mrow><mi mathvariant="normal">Pt</mi></math></span>

F. G. Kondev; M. P. Carpenter; R. V. F. Janssens; I. Wiedenhöver; M. Alcorta; L. T. Brown; C. N. Davids; T. L. Khoo; T. Lauritsen; C. J. Lister; D. Seweryniak; S. Siem; A. A. Sonzogni; J. Uusitalo; P. Bhattacharyya; S. M. Fischer; W. Reviol; L. L. Riedinger; R. Nouicer

doi:10.1103/PhysRevC.61.044323

High-spin collective structures in $^{178} Pt$

F. G. Kondev, M. P. Carpenter, R. V. F. Janssens, I. Wiedenhöver, M. Alcorta, L. T. Brown, C. N. Davids, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Siem, A. A. Sonzogni, J. Uusitalo, P. Bhattacharyya, S. M. Fischer, W. Reviol, L. L. Riedinger, and R. Nouicer

Phys. Rev. C 61, 044323 – Published 20 March 2000

Abstract

Collective structures in $^{178} Pt$ have been investigated with $γ$ -ray spectroscopic techniques following mass selection. The present data expand considerably the level scheme of this nucleus. A new collective structure has been identified and the known bands have been extended to higher spins. Firm spin and parity assignments have been made to many levels. Of particular interest are the negative parity bands which are interpreted in terms of structures associated with octupole vibrations crossed at moderate spin by two-quasiparticle excitations. The systematics of the $α$ -decay reduced widths in Pt nuclei has also been investigated. The differences of a factor of about 2 between the widths for the odd- and the even- $A$ isotopes is attributed to changes in neutron pairing associated with the blocking effect. The trend is reproduced in calculations based on the Lipkin-Nogami pairing model.

Received 12 November 1999

DOI:https://doi.org/10.1103/PhysRevC.61.044323

Authors & Affiliations

F. G. Kondev, M. P. Carpenter, R. V. F. Janssens, I. Wiedenhöver, M. Alcorta, L. T. Brown^*, C. N. Davids, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak^†, S. Siem^‡, A. A. Sonzogni, and J. Uusitalo^§

Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

P. Bhattacharyya

Department of Chemistry, Purdue University, West Lafayette, Indiana 47907

S. M. Fischer

Department of Physics, DePaul University, Chicago, Illinois 60614

W. Reviol and L. L. Riedinger

Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996

R. Nouicer

Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607

^*Also at: Department of Physics, Vanderbilt University, Nashville, TN 37235.
^†Also at: Department of Chemistry, University of Maryland, College Park, MD 20742.
^‡Also at: Department of Physics, University of Oslo, N-0316 Oslo, Norway.
^§Present address: Department of Physics, University of Jyväskylä, P.O. Box 35, 40351 Jyväskylä, Finland.

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Vol. 61, Iss. 4 — April 2000

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