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https://hdl.handle.net/2440/121518
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Type: | Journal article |
Title: | Parameter optimization for the latest quark-meson coupling energy-density functional |
Author: | Martinez, K.L. Thomas, A.W. Stone, J.R. Guichon, P.A.M. |
Citation: | Physical Review C, 2019; 100(2):024333-1-024333-16 |
Publisher: | American Physical Society |
Issue Date: | 2019 |
ISSN: | 2469-9985 2469-9993 |
Statement of Responsibility: | K.L. Martinez, A.W. Thomas, J.R. Stone, P.A.M. Guichon |
Abstract: | The quark-meson-coupling (QMC) model self-consistently relates the dynamics of the internal quark structure of a hadron to the relativistic mean fields arising in nuclear matter. It offers a natural explanation to some open questions in nuclear theory, including the origin of many-body nuclear forces and their saturation, the spin-orbit interaction, and properties of hadronic matter at a wide range of densities. The QMC energy density functionals QMC-I and QMCπ-I have been successfully applied to calculate ground state observables of finite nuclei in the Hartree-Fock + BCS approximation, as well as to predict properties of dense nuclear matter and cold nonrotating neutron stars. Here we report the latest development of the model, QMCπ-II, which includes higher order terms in density in the expansion of the relativistic energy-density functional, as well as the self-interaction of the σ meson. A derivative-free optimization algorithm has been employed to determine a new set of the model parameters and their statistics, including errors and correlations. QMCπ-II predictions for a wide range of properties of even-even nuclei across the nuclear chart, with fewer adjustable parameters, are comparable with other models. The nuclear incompressibility is significantly reduced in this version, leading to a description of giant monopole resonances which is consistent with experimental data. |
Rights: | ©2019 American Physical Society |
DOI: | 10.1103/PhysRevC.100.024333 |
Grant ID: | http://purl.org/au-research/grants/arc/CE1101004 http://purl.org/au-research/grants/arc/DP150103101 http://purl.org/au-research/grants/arc/DP180100497 |
Published version: | http://dx.doi.org/10.1103/physrevc.100.024333 |
Appears in Collections: | Aurora harvest 4 Physics publications |
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