N. Liliani , A.M. Nugraha , J.P. Diningrum , A. Sulaksono
{"title":"相对论平均场模型的张量和等矢量等标量项:对中子蒙皮厚度、电荷半径和核物质的影响","authors":"N. Liliani , A.M. Nugraha , J.P. Diningrum , A. Sulaksono","doi":"10.1016/j.nuclphysa.2023.122812","DOIUrl":null,"url":null,"abstract":"<div><p>The origin of the neutron skin thickness, measured by the CREX and PREX collaborations as thin for <sup>40</sup>Ca and thick for <sup>28</sup><span>Pb, remains a mystery. We investigate the effects of tensor and nonlinear isovector–isoscalar terms in a relativistic mean-field model (RMF) on the properties of finite nuclei and nuclear matter. Tensor couplings are crucial for better quality binding energies of finite nuclei and charge radii for relatively heavy nuclei. However, for light nuclei, the tensor terms cannot improve the compatibility of charge radius predictions by the RMF model with experimental data. We find that parameter sets with a larger nonlinear isovector–isoscalar parameter, particularly </span><span><math><msub><mrow><mi>η</mi></mrow><mrow><mn>2</mn><mi>ρ</mi></mrow></msub></math></span> = 0.028, agree better with experimental data for Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> across light, medium, and heavy isotope chains. Using PT28, we calculate Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for <sup>208</sup>Pb as 0.214 fm, <em>J</em> as 33.078, and <em>L</em> as 58.426. Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for <sup>208</sup>Pb obtained using PT28 is consistent with the PREX-II data. Moreover, the corresponding values of <em>J</em> and <em>L</em> agree with the low <em>L</em> constraints. Meanwhile, the canonical mass radius predicted by PT28 aligns with the mass and radius data from the NICER collaboration. The combination of tensor and nonlinear isovector–isoscalar couplings in the RMF model provides accurate predictions for finite nuclei binding energies and relatively heavy nuclei charge radii, resulting in relatively thick Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> values for <sup>208</sup>Pb without substantial <em>L</em> values.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Tensor and isovector–isoscalar terms of relativistic mean field model: Impacts on neutron-skin thickness, charge radius, and nuclear matter\",\"authors\":\"N. Liliani , A.M. Nugraha , J.P. Diningrum , A. Sulaksono\",\"doi\":\"10.1016/j.nuclphysa.2023.122812\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The origin of the neutron skin thickness, measured by the CREX and PREX collaborations as thin for <sup>40</sup>Ca and thick for <sup>28</sup><span>Pb, remains a mystery. We investigate the effects of tensor and nonlinear isovector–isoscalar terms in a relativistic mean-field model (RMF) on the properties of finite nuclei and nuclear matter. Tensor couplings are crucial for better quality binding energies of finite nuclei and charge radii for relatively heavy nuclei. However, for light nuclei, the tensor terms cannot improve the compatibility of charge radius predictions by the RMF model with experimental data. We find that parameter sets with a larger nonlinear isovector–isoscalar parameter, particularly </span><span><math><msub><mrow><mi>η</mi></mrow><mrow><mn>2</mn><mi>ρ</mi></mrow></msub></math></span> = 0.028, agree better with experimental data for Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> across light, medium, and heavy isotope chains. Using PT28, we calculate Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for <sup>208</sup>Pb as 0.214 fm, <em>J</em> as 33.078, and <em>L</em> as 58.426. Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for <sup>208</sup>Pb obtained using PT28 is consistent with the PREX-II data. Moreover, the corresponding values of <em>J</em> and <em>L</em> agree with the low <em>L</em> constraints. Meanwhile, the canonical mass radius predicted by PT28 aligns with the mass and radius data from the NICER collaboration. 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Tensor and isovector–isoscalar terms of relativistic mean field model: Impacts on neutron-skin thickness, charge radius, and nuclear matter
The origin of the neutron skin thickness, measured by the CREX and PREX collaborations as thin for 40Ca and thick for 28Pb, remains a mystery. We investigate the effects of tensor and nonlinear isovector–isoscalar terms in a relativistic mean-field model (RMF) on the properties of finite nuclei and nuclear matter. Tensor couplings are crucial for better quality binding energies of finite nuclei and charge radii for relatively heavy nuclei. However, for light nuclei, the tensor terms cannot improve the compatibility of charge radius predictions by the RMF model with experimental data. We find that parameter sets with a larger nonlinear isovector–isoscalar parameter, particularly = 0.028, agree better with experimental data for Δ across light, medium, and heavy isotope chains. Using PT28, we calculate Δ for 208Pb as 0.214 fm, J as 33.078, and L as 58.426. Δ for 208Pb obtained using PT28 is consistent with the PREX-II data. Moreover, the corresponding values of J and L agree with the low L constraints. Meanwhile, the canonical mass radius predicted by PT28 aligns with the mass and radius data from the NICER collaboration. The combination of tensor and nonlinear isovector–isoscalar couplings in the RMF model provides accurate predictions for finite nuclei binding energies and relatively heavy nuclei charge radii, resulting in relatively thick Δ values for 208Pb without substantial L values.
期刊介绍:
Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.