Excited States in H176,178g and Shape Coexistence in Very Neutron-Deficient Hg Isotopes

M. P. Carpenter, R. V. F. Janssens, H. Amro, D. J. Blumenthal, L. T. Brown, D. Seweryniak, P. J. Woods, D. Ackermann, I. Ahmad, C. Davids, S. M. Fischer, G. Hackman, J. H. Hamilton, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Nisius, A. V. Ramayya, W. Reviol, J. Schwartz, J. Simpson, and J. Wauters
Phys. Rev. Lett. 78, 3650 – Published 12 May 1997
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Abstract

Excited states have been observed for the first time in the neutron-deficient 176,178Hg nuclei using the recoil-decay tagging (RDT) technique in which prompt γ rays are associated with a particular isotope through a correlation with the characteristic ground state α decay. Below N=102, the excitation energy of a rotational band built on a prolate shape (β20.25) increases with decreasing mass to the point where there is no longer any evidence for its presence at low spin in 176Hg. The data are in qualitative agreement with recent mean field calculations.

  • Received 27 February 1997

DOI:https://doi.org/10.1103/PhysRevLett.78.3650

©1997 American Physical Society

Authors & Affiliations

M. P. Carpenter1, R. V. F. Janssens1, H. Amro1,2,3, D. J. Blumenthal1, L. T. Brown1,4, D. Seweryniak1, P. J. Woods5, D. Ackermann1, I. Ahmad1, C. Davids1, S. M. Fischer1, G. Hackman1, J. H. Hamilton4, T. L. Khoo1, T. Lauritsen1, C. J. Lister1, D. Nisius1, A. V. Ramayya4, W. Reviol6, J. Schwartz1,7, J. Simpson8, and J. Wauters6

  • 1Argonne National Laboratory, Argonne, Illinois 60439
  • 2North Carolina State University, Raleigh, North Carolina 27695
  • 3and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308
  • 4Department of Physics, Vanderbilt University, Nashville, Tennessee 37235
  • 5Department of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, United Kingdom
  • 6Department of Physics, University of Tennessee, Knoxville, Tennessee 37996
  • 7WSNL, Yale University, New Haven, Connecticut 06511
  • 8CCLRC, Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom

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Vol. 78, Iss. 19 — 12 May 1997

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