dorsal/arxiv
View SchemaThe island of deformation and shape co-existence in neutron-deficient nuclei of the Pb region using relativistic mean field model
| Authors | M. S. Mehta, T. K. Jha, S. K. Patra, Raj K. Gupta |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0401021 |
| URL | https://arxiv.org/abs/nucl-th/0401021 |
Abstract
We have investigated the ground-state structures of even-even neutron-deficient isotopes of Hg and Pb nuclei within the framework of a deformed relativistic mean field formalism for a number of commonly used parameter sets, namely NL1, NL3, NL-SH, NL-RA1 and TM1. The ground states of a bunch of Hg and Pb-isotopes towards the proton-dripline are found to be deformed for all the forces, with a constant pairing gap. The small differences in the ground- and the first-excited state binding energies predict a sea of low-lying excited states, and hence of shape co-existence, for both the Hg and Pb nuclei. In general, a discrepancy between the experimentally observed and theoretically predicted (sign of) quadrupole deformations is noticed in this mass region. The constrained potential energy surfaces and the single-particle energy spectra analyzed for some selected nuclei show that the known large shell gap for Pb nuclei at Z=82 is almost extinguished for its proton-rich isotopes.
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"abstract": "We have investigated the ground-state structures of even-even\nneutron-deficient isotopes of Hg and Pb nuclei within the framework of a\ndeformed relativistic mean field formalism for a number of commonly used\nparameter sets, namely NL1, NL3, NL-SH, NL-RA1 and TM1. The ground states of a\nbunch of Hg and Pb-isotopes towards the proton-dripline are found to be\ndeformed for all the forces, with a constant pairing gap. The small differences\nin the ground- and the first-excited state binding energies predict a sea of\nlow-lying excited states, and hence of shape co-existence, for both the Hg and\nPb nuclei. In general, a discrepancy between the experimentally observed and\ntheoretically predicted (sign of) quadrupole deformations is noticed in this\nmass region. The constrained potential energy surfaces and the single-particle\nenergy spectra analyzed for some selected nuclei show that the known large\nshell gap for Pb nuclei at Z=82 is almost extinguished for its proton-rich\nisotopes.",
"arxiv_id": "nucl-th/0401021",
"authors": [
"M. S. Mehta",
"T. K. Jha",
"S. K. Patra",
"Raj K. Gupta"
],
"categories": [
"nucl-th"
],
"title": "The island of deformation and shape co-existence in neutron-deficient nuclei of the Pb region using relativistic mean field model",
"url": "https://arxiv.org/abs/nucl-th/0401021"
},
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