Exploring the neutron-star matter properties via the deformed nuclear reactions
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| Format: | Preprint |
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2025
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| _version_ | 1866909655902453760 |
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| author | Guo, Yuan-Qing Zhang, Ya-Peng Feng, Zhao-Qing |
| author_facet | Guo, Yuan-Qing Zhang, Ya-Peng Feng, Zhao-Qing |
| contents | Within the framework of Lanzhou quantum molecular dynamics transport model, the correlation of initial deformation and isospin diffusion is systematically investigated in collisions of $^{238}$U + $^{238}$U. The impacts of the collision centrality, symmetry energy and initial configuration on the collective flows, neutron/proton and $π^{-}/π^{+}$ ratios have been systematically investigated. It is found that the broader neutron-rich region is formed in the body-body collisions in comparison with the ones in the tip-tip collisions. The neutron-star matter might be created in the density region of 0.2-0.5 $ρ_{0}$ (the normal nuclear density $ρ_{0}$=0.165 fm$^{-3}$) formed in the $^{238}$U + $^{238}$U reaction at the incident energy of 500 MeV/nucleon. The elliptic flows of protons are related to the incident energy, collision centrality, symmetry energy and collision orientation. The hard symmetry energy enables the larger free neutron/proton ratio at the beam energy of 500 MeV/nucleon. However, the neutron/proton and $π^{-}/π^{+}$ ratios in the density regime of $1.2\leq ρ/ρ_{0}\leq1.8$ are enhanced by the soft symmetry energy with the slope parameter of L=42 MeV. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_17571 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exploring the neutron-star matter properties via the deformed nuclear reactions Guo, Yuan-Qing Zhang, Ya-Peng Feng, Zhao-Qing Nuclear Theory Within the framework of Lanzhou quantum molecular dynamics transport model, the correlation of initial deformation and isospin diffusion is systematically investigated in collisions of $^{238}$U + $^{238}$U. The impacts of the collision centrality, symmetry energy and initial configuration on the collective flows, neutron/proton and $π^{-}/π^{+}$ ratios have been systematically investigated. It is found that the broader neutron-rich region is formed in the body-body collisions in comparison with the ones in the tip-tip collisions. The neutron-star matter might be created in the density region of 0.2-0.5 $ρ_{0}$ (the normal nuclear density $ρ_{0}$=0.165 fm$^{-3}$) formed in the $^{238}$U + $^{238}$U reaction at the incident energy of 500 MeV/nucleon. The elliptic flows of protons are related to the incident energy, collision centrality, symmetry energy and collision orientation. The hard symmetry energy enables the larger free neutron/proton ratio at the beam energy of 500 MeV/nucleon. However, the neutron/proton and $π^{-}/π^{+}$ ratios in the density regime of $1.2\leq ρ/ρ_{0}\leq1.8$ are enhanced by the soft symmetry energy with the slope parameter of L=42 MeV. |
| title | Exploring the neutron-star matter properties via the deformed nuclear reactions |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2506.17571 |