Novel features of asymmetric nuclear matter from terrestrial experiments and astrophysical observations of neutron stars
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866916644881694720 |
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| author | Miyatsu, Tsuyoshi Cheoun, Myung-Ki Kim, Kyungsik Saito, Koichi |
| author_facet | Miyatsu, Tsuyoshi Cheoun, Myung-Ki Kim, Kyungsik Saito, Koichi |
| contents | The accurate measurement of neutron skin thickness of $^{208}$Pb by the PREX Collaboration suggests a large value of the nuclear symmetry energy slope parameter, $L$, whereas the smaller $L$ is preferred to account for the small neutron-star radii from NICER observations. To resolve this discrepancy between nuclear experiments and astrophysical observations, new effective interactions have been developed using relativistic mean-field models with the isoscalar- and isovector-meson mixing. We investigate the effects of $δ$-nucleon coupling and $σ$--$δ$ mixing on the ground-state properties of finite nuclei, as well as the characteristics of isospin-asymmetric nuclear matter and neutron stars. Additionally, we explore the role of the quartic $ρ$-meson self-interaction in dense nuclear matter to mitigate the stiff equation of state for neutron stars resulting from the large $δ$-nucleon coupling. It is found that the nuclear symmetry energy undergoes a sudden softening at approximately twice the saturation density of nuclear matter, taking into account the PREX-2 result, the recent NICER observation of PSR J0437$-$4715, and the binary neutron star merger, GW170817. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_13210 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Novel features of asymmetric nuclear matter from terrestrial experiments and astrophysical observations of neutron stars Miyatsu, Tsuyoshi Cheoun, Myung-Ki Kim, Kyungsik Saito, Koichi Nuclear Theory Nuclear Experiment The accurate measurement of neutron skin thickness of $^{208}$Pb by the PREX Collaboration suggests a large value of the nuclear symmetry energy slope parameter, $L$, whereas the smaller $L$ is preferred to account for the small neutron-star radii from NICER observations. To resolve this discrepancy between nuclear experiments and astrophysical observations, new effective interactions have been developed using relativistic mean-field models with the isoscalar- and isovector-meson mixing. We investigate the effects of $δ$-nucleon coupling and $σ$--$δ$ mixing on the ground-state properties of finite nuclei, as well as the characteristics of isospin-asymmetric nuclear matter and neutron stars. Additionally, we explore the role of the quartic $ρ$-meson self-interaction in dense nuclear matter to mitigate the stiff equation of state for neutron stars resulting from the large $δ$-nucleon coupling. It is found that the nuclear symmetry energy undergoes a sudden softening at approximately twice the saturation density of nuclear matter, taking into account the PREX-2 result, the recent NICER observation of PSR J0437$-$4715, and the binary neutron star merger, GW170817. |
| title | Novel features of asymmetric nuclear matter from terrestrial experiments and astrophysical observations of neutron stars |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2411.13210 |