dorsal/arxiv
View SchemaExploring the extended density-dependent Skyrme effective forces for normal and isospin-rich nuclei to neutron stars
| Authors | B. K. Agrawal, Shashi K. Dhiman, Raj Kumar |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0604045 |
| URL | https://arxiv.org/abs/nucl-th/0604045 |
| DOI | 10.1103/PhysRevC.73.034319 |
| Journal | Phys.Rev.C73:034319,2006 |
Abstract
We parameterize the recently proposed generalized Skyrme effective force (GSEF) containing extended density dependence. The parameters of the GSEF are determined by the fit to several properties of the normal and isospin-rich nuclei. We also include in our fit a realistic equation of state for the pure neutron matter up to high densities so that the resulting Skyrme parameters can be suitably used to model the neutron star with the "canonical" mass ($\sim 1.4 M_\odot$). For the appropriate comparison we generate a parameter set for the standard Skyrme effective force (SSEF) using exactly the same set of the data as employed to determine the parameters of the GSEF. We find that the GSEF yields larger values for the neutron skin thickness which are closer to the recent predictions based on the isospin diffusion data. The Skyrme parameters so obtained are employed to compute the strength function for the isoscalar giant monopole, dipole and quadrupole resonances. It is found that in the case of GSEF, due to the the larger value of the nucleon effective mass the values of centroid energies for the isoscalar giant resonances are in better agreement with the corresponding experimental data in comparison to those obtained using the SSEF. We also present results for some of the key properties associated with the neutron star of "canonical" mass and for the one with the maximum mass.
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"abstract": "We parameterize the recently proposed generalized Skyrme effective force\n(GSEF) containing extended density dependence. The parameters of the GSEF are\ndetermined by the fit to several properties of the normal and isospin-rich\nnuclei. We also include in our fit a realistic equation of state for the pure\nneutron matter up to high densities so that the resulting Skyrme parameters can\nbe suitably used to model the neutron star with the \"canonical\" mass ($\\sim 1.4\nM_\\odot$). For the appropriate comparison we generate a parameter set for the\nstandard Skyrme effective force (SSEF) using exactly the same set of the data\nas employed to determine the parameters of the GSEF. We find that the GSEF\nyields larger values for the neutron skin thickness which are closer to the\nrecent predictions based on the isospin diffusion data. The Skyrme parameters\nso obtained are employed to compute the strength function for the isoscalar\ngiant monopole, dipole and quadrupole resonances. It is found that in the case\nof GSEF, due to the the larger value of the nucleon effective mass the values\nof centroid energies for the isoscalar giant resonances are in better agreement\nwith the corresponding experimental data in comparison to those obtained using\nthe SSEF. We also present results for some of the key properties associated\nwith the neutron star of \"canonical\" mass and for the one with the maximum\nmass.",
"arxiv_id": "nucl-th/0604045",
"authors": [
"B. K. Agrawal",
"Shashi K. Dhiman",
"Raj Kumar"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.73.034319",
"journal_ref": "Phys.Rev.C73:034319,2006",
"title": "Exploring the extended density-dependent Skyrme effective forces for normal and isospin-rich nuclei to neutron stars",
"url": "https://arxiv.org/abs/nucl-th/0604045"
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