Eur. Phys. J. A 14, 23-28 (2002)
DOI: 10.1140/epja/iepja1320
The
shell closure in neutron-deficient Pb isotopes
M. Bender1, T. Cornelius2, G.A. Lalazissis3, 4, J.A. Maruhn2, 4, W. Nazarewicz5, 6, 7 and P.-G. Reinhard4, 8
1 Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
2 Institut für Theoretische Physik, Universität Frankfurt, Robert-Mayer-Strasse 8-10, D-60325 Frankfurt am Main, Germany
3 Department of Theoretical Physics, Aristotle University of Thessaloniki, Gr-54006 Thessaloniki, Greece
4 Joint Institute for Heavy-Ion Research, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA
5 Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
6 Institute of Theoretical Physics, Warsaw University, ul. Hoza 69, PL-00681, Warsaw, Poland
7 Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA
8 Institut für Theoretische Physik II, Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany
mbender@ulb.ac.be
(Received: 25 October 2001 / Revised version: 26 February 2002 Communicated by P. Schuck)
Abstract
Recent mass measurements show a substantial weakening of the binding-energy difference in the neutron-deficient Pb isotopes.
As
is
often attributed to the size of the proton magic gap, it might be
speculated that reduction in
is related to a weakening
of the spherical shell. We demonstrate that the observed
trend is described quantitatively by self-consistent mean-field models
in terms of deformed ground states of Hg and Po isotopes.
21.10.Dr - Binding energies and masses.
21.60.Jz - Hartree-Fock and random-phase approximations.
27.70.+q -
.
27.80.+w -
.
© Società Italiana di Fisica, Springer-Verlag 2002
