Superheavy nuclei with the vector self-coupling of the $ω$-meson in the relativistic mean-field theory

Details Superheavy nuclei with the vector self-coupling of the $ω$-meson in the relativistic mean-field theory Superheavy nuclei with the vector self-coupling of the $ω$-meson in the relativistic mean-field theory

2009-08-19

arxiv.org/abs/0908.2678v2

J. Phys. G: Nucl Part Phys 36 (2009) 115103

Physics

Nuclear Physics

Nuclear Theory

30 pages, 17 figures; Bibliography and citations corrected; To appear in J. Phys G: Nucl. Part. Phys

Scientific paper

10.1088/0954-3899/36/11/115103

We have studied properties and shell structure of the superheavy elements from Z=102 to Z=120 within the framework of the RMF theory. The region of study spans nuclides with neutron numbers N=150-190. The Lagrangian model NL-SV1 with the inclusion of the vector self-coupling of the omega-meson has been employed in this work. We have performed RMF + BCS calculations for an axially deformed configuration of nuclei. The ground-state binding energies, single-particle properties and quadrupole deformation of nuclei have been obtained from the mean-field minimizations. Two-neutron separation energies, $Q_\alpha$ values and alpha-decay half-life have been evaluated. It is shown that a large number of nuclides exhibit the phenomenon of shape-coexistence over a significant region of the superheavy elements. Shape coexistence of a prolate and an oblate shape is prevalent in nuclides far below N=184, whilst nuclei in the vicinity of N=184 tend to show a shape coexistence between a spherical and an oblate shape. The shell structure and 2-neutron separation energies obtained with the RMF theory reinforce the neutron number N=184 as a major magic number. It is shown that the neutron number N=172 acts akin to a magic number in the deformed region. It is suggested that the combination Z=120 and N=172 has the potential of being a doubly magic number in the superheavy region.

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