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Title: Symmetry energy III: Isovector skins

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Journal Article: Publisher's Accepted Manuscript
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Nuclear Physics. A
Additional Journal Information:
Journal Volume: 958; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-07 09:52:29; Journal ID: ISSN 0375-9474
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Danielewicz, Paweł, Singh, Pardeep, and Lee, Jenny. Symmetry energy III: Isovector skins. Netherlands: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2016.11.008.
Danielewicz, Paweł, Singh, Pardeep, & Lee, Jenny. Symmetry energy III: Isovector skins. Netherlands. doi:10.1016/j.nuclphysa.2016.11.008.
Danielewicz, Paweł, Singh, Pardeep, and Lee, Jenny. Wed . "Symmetry energy III: Isovector skins". Netherlands. doi:10.1016/j.nuclphysa.2016.11.008.
title = {Symmetry energy III: Isovector skins},
author = {Danielewicz, Paweł and Singh, Pardeep and Lee, Jenny},
abstractNote = {},
doi = {10.1016/j.nuclphysa.2016.11.008},
journal = {Nuclear Physics. A},
number = C,
volume = 958,
place = {Netherlands},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}

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Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nuclphysa.2016.11.008

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Cited by: 6works
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  • By exploiting Coulomb dissociation of high-energy radioactive beams of the neutron-rich nuclei {sup 129-132}Sn and {sup 133,134}Sb, their dipole-strength distributions have been measured. A sizable fraction of ''pygmy'' dipole strength, energetically located below the giant dipole resonance, is observed in all of these nuclei. A comparison with available pygmy resonance data in stable nuclei ({sup 208}Pb and N=82 isotones) indicates a trend of strength increasing with the proton-to-neutron asymmetry. On theoretical grounds, employing the RQRPA approach, a one-to-one correlation is found between the pygmy strength and parameters describing the density dependence of the nuclear symmetry energy, and in turn withmore » the thicknesses of the neutron skins. On this basis, by using the experimental pygmy strength, parameters of the nuclear symmetry energy (a{sub 4}=32.0{+-}1.8 MeV and p{sub o}=2.3{+-}0.8 MeV/fm{sup 3}) are deduced as well as neutron-skin thicknesses R{sub n}-R{sub p} of 0.24{+-}0.04 fm for {sup 132}Sn and of 0.18{+-}0.035 fm for {sup 208}Pb, both doubly magic nuclei. Astrophysical implications with regard to neutron stars are briefly addressed.« less
  • Correlations between the behavior of the nuclear symmetry energy, the neutron skins, and the percentage of energy-weighted sum rule (EWSR) exhausted by the pygmy dipole resonance (PDR) in {sup 68}Ni and {sup 132}Sn are investigated by using different random phase approximation (RPA) models for the dipole response, based on a representative set of Skyrme effective forces plus meson-exchange effective Lagrangians. A comparison with the experimental data has allowed us to constrain the value of the derivative of the symmetry energy at saturation. The neutron skin radius is deduced under this constraint.
  • The temperature dependence of the nuclear matter isovector symmetry energy coefficient (A{sub 0,1}) is investigated in the framework of the generalized nuclear polarizability with Skyrme interactions, as worked out in previous articles [F. L. Braghin, Nucl. Phys. A665, 13 (2000); Phys Rev. C 71, 064303 (2005); Int J. Mod. Phys. E 12, 755 (2003)]. The variation of A{sub 0,1}(T) is very small (of the order of 1 MeV) for temperatures (T) in the range of 0 and 18 MeV. Different behaviors with temperature are found to strongly depend on the Skyrme parametrization, in particular at densities lower than the saturationmore » density {rho}{sub 0}.« less
  • Cited by 11