dorsal/arxiv
View SchemaRoles of isoscalar hyperons in probing the density dependence of the nuclear symmetry energy
| Authors | W. Z. Jiang |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0609024 |
| URL | https://arxiv.org/abs/nucl-th/0609024 |
| DOI | 10.1016/j.physletb.2006.09.020 |
| Journal | Phys.Lett.B642:28-33,2006 |
Abstract
The role of the isoscalar hyperon Lambda in probing the density dependence of the nuclear symmetry energy is studied in multi-Lambda hypernuclei, hyperon-rich matter and neutron stars in relativistic models. Relationships between the properties of three types of objects and the neutron thickness in 208Pb are established with respect to the isoscalar-isovector coupling that modifies the density dependence of the symmetry energy. The exotic isotopes far from the neutron drip line can be stabilized by filling in considerable Lambda hyperons. The difference of the binding energy of multi-Lambda hypernuclei from different models is attributed to different symmetry energies. The isovector potential together with the neutron thickness in multi-Lambda hypernuclei investigated is very sensitive to the isoscalar-isovector coupling. The large sensitivity of the Lambda hyperon fraction to the isoscalar-isovector coupling occurs at about 2-3 rho_0 in beta equilibrated hyperon-rich matter. In neutron stars with hyperonization, an on-off effect with respect to the isoscalar-isovector coupling exists for the neutron star radius.
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"abstract": "The role of the isoscalar hyperon Lambda in probing the density dependence of\nthe nuclear symmetry energy is studied in multi-Lambda hypernuclei,\nhyperon-rich matter and neutron stars in relativistic models. Relationships\nbetween the properties of three types of objects and the neutron thickness in\n208Pb are established with respect to the isoscalar-isovector coupling that\nmodifies the density dependence of the symmetry energy. The exotic isotopes far\nfrom the neutron drip line can be stabilized by filling in considerable Lambda\nhyperons. The difference of the binding energy of multi-Lambda hypernuclei from\ndifferent models is attributed to different symmetry energies. The isovector\npotential together with the neutron thickness in multi-Lambda hypernuclei\ninvestigated is very sensitive to the isoscalar-isovector coupling. The large\nsensitivity of the Lambda hyperon fraction to the isoscalar-isovector coupling\noccurs at about 2-3 rho_0 in beta equilibrated hyperon-rich matter. In neutron\nstars with hyperonization, an on-off effect with respect to the\nisoscalar-isovector coupling exists for the neutron star radius.",
"arxiv_id": "nucl-th/0609024",
"authors": [
"W. Z. Jiang"
],
"categories": [
"nucl-th",
"astro-ph"
],
"doi": "10.1016/j.physletb.2006.09.020",
"journal_ref": "Phys.Lett.B642:28-33,2006",
"title": "Roles of isoscalar hyperons in probing the density dependence of the nuclear symmetry energy",
"url": "https://arxiv.org/abs/nucl-th/0609024"
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