The Z=82 shell closure in neutron-deficient Pb isotopes

2001/10/23 by M. Bender, T. Cornelius, G. A. Lalazissis +3
Physics and Astronomy · #nucl-th

paper · pdf

published as Eur.Phys.J. A14 (2002) 23-28 · submitted to Eur. Phys. J. A

arxiv created 2001/10/23 · arxiv updated 2009/12/01

Abstract

Recent mass measurements show a substantial weakening of the binding energy difference delta_2p (Z,N) = E(Z-2,N) - 2 E(Z,N) + E(Z+2,N) in the neutron-deficient Pb isotopes. As delta_2p is often attributed to the size of the proton magic gap, it might be speculated that the reduction in delta_2p 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.

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