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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 14, 23-28 (2002)
DOI: 10.1140/epja/iepja1320

The $\mth{Z=82}$ 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 $\delta_{\rm 2p}$ is often attributed to the size of the proton magic gap, it might be speculated that reduction in $\delta_{\rm 2p}$ 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.

PACS
21.10.Dr - Binding energies and masses.
21.60.Jz - Hartree-Fock and random-phase approximations.
27.70.+q - $150 \leq A \leq 189$ .
27.80.+w - $190 \leq A \leq 219$ .

© Società Italiana di Fisica, Springer-Verlag 2002

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