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The Z = 82 shell closure in neutron-deficient Pb isotopes |
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| Authors: | M Bender T Cornelius GA Lalazissis JA Maruhn W Nazarewicz P-G Reinhard |
| Institution: | Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany, DE Institut für Theoretische Physik, Universit?t Frankfurt, Robert-Mayer-Strasse 8-10, D-60325 Frankfurt am Main, Germany, DE Department of Theoretical Physics, Aristotle University of Thessaloniki, Gr-54006 Thessaloniki, Greece, GR Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA, US Joint Institute for Heavy-Ion Research, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA, US |
| Abstract: | Recent mass measurements show a substantial weakening of the binding-energy difference δ2p(Z, N) = E(Z - 2, N) - 2E(Z, N) + E(Z + 2, N) in the neutron-deficient Pb isotopes. As δ2p is often attributed to the size of the proton magic gap, it might be speculated that reduction in δ2p is related to a weakening of the spherical Z = 82 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. Received: 25 October 2001 / Accepted: 28 February 2002 |
| Keywords: | PACS 21 10 Dr Binding energies and masses – 21 60 Jz Hartree-Fock and random-phase approximations – 27 70 +q 150 ?A? 189 – 27 80 +w 190 ?A? 219 |
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