arXiv:nucl-th/0110057·v1·Nuclear Theory
The Z=82 shell closure in neutron-deficient Pb isotopes
M. Bender🇩🇪 · T. Cornelius🇩🇪 · G. A. Lalazissis🇬🇷 · J. A. Maruhn🇩🇪 · W. Nazarewicz🇺🇸 · P.-G. Reinhard🇺🇸
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.
Comments: submitted to Eur. Phys. J. A