Properties of N=84, even-even nuclei populated in the spontaneous fission of 248Cm
A. Korgul1 - W. Urban1 - T. Rzaca-Urban1 - M. Rejmund2 - J.L. Durell3 - M.J. Leddy3 - M.A. Jones3 - W.R. Phillips3 - A.G. Smith3 - B.J. Varley3 - N. Schulz4 - M. Bentaleb4 - E. Lubkiewicz4 - I. Ahmad5 L.R. Morss5
1 Institute of Experimental Physics, Warsaw University, ul.Hoza 69, 00-681 Warszawa,
Poland
2 Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, bat. 104, 91405 Orsay Campus, France
3 Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, Manchester M13
9PL, UK
4 Institut de Recherches Subatomiques, CNRS-IN2P3 et Universite Louis Pasteur, 67037 Strasbourg, France
5 Argonne National Laboratory, Argonne, IL 60439, USA
Received: 10 November 1999 / Revised version: 22 December 1999 Communicated by D. Schwalm
Abstract
Excited states in the neutron-rich, N=84 nuclei 134Sn,
136Te and 138Xe, populated in the spontaneous fission of 248Cm,
were studied to medium spins using the EUROGAM2 array. OXBASH code
calculations support the experimental identification of maximum aligned
configurations in these isotopes. Empirical shell model calculations
agree with the proposed excitation energy of the neutron h9/2 excitation
in the 132Sn region. A discrepancy between the observed and calculated
excitation energy of the I
=12+ level in 136Te indicates
possible admixtures of collective excitations in this nucleus. Clear
signs of collective excitations are observed in 138Xe.
PACS
21.60.Cs Shell model -
23.20.Lv Gamma transitions and level energies -
27.80.+w
-
25.70.-z Low and intermediate energy heavy-ion reactions
Copyright Società Italiana di Fisica, Springer-Verlag 2000
