DOI: 10.1140/epja/i2002-10127-4
Short Note
The strength of octupole correlations in neutron-rich Xe isotopes
W. Urban1, T. Rzaca-Urban1, N. Schulz2, J.L. Durell3, W.R. Phillips3, A.G. Smith3, B.J. Varley3 and I. Ahmad41 Institute of Experimental Physics, Warsaw University, ul.Hoza 69, 00-681 Warszawa, Poland
2 Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 and Université Louis Pasteur, 67037 Strasbourg, France
3 Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
4 Argonne National Laboratory, Argonne, IL 60439, USA
urban@fuw.edu.pl
(Received: 18 November 2002 / Published online: 25 February 2003)
Abstract
Excited levels in
140Xe and
142Xe nuclei, populated in
the spontaneous fission of
248Cm, were studied by means of prompt
-ray spectroscopy, using EUROGAM2 array. We report the first
observation of an octupole band in
142Xe and extend the octupole
band in
140Xe. Level schemes of
140Xe and
142Xe
obtained in this work show patterns characteristic of
ocupole-vibrational bands. Properties of octupole bands in Xe isotopes
indicate that octupole correlations in these nuclei are lower than in
the corresponding Ba nuclei. The electric dipole moment of
142Xe
was found to be larger than in other Xe isotopes, contrary to
theoretical predictions. This may be due to the special role of the
N=88 neutron number.
23.20.Lv - Gamma transitions and level energies.
21.60.Cs - Shell model.
25.85.Ca - Spontaneous fission.
27.60.+j -
.
© Società Italiana di Fisica, Springer-Verlag 2003
