Shedding light on the pion production in heavy-ion collisions and application into the neutron star matter properties
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866914828448169984 |
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| author | Liu, Heng-Jin Zhang, Ban Guo, Yuan-Qing Cheng, Hui-Gan Wei, Si-Na Feng, Zhao-Qing |
| author_facet | Liu, Heng-Jin Zhang, Ban Guo, Yuan-Qing Cheng, Hui-Gan Wei, Si-Na Feng, Zhao-Qing |
| contents | Within the framework of the quantum molecular dynamics transport model, the pion production and constraint of the high-density symmetry energy in heavy-ion collisions near threshold energy have been thoroughly investigated. The energy conservation in the decay of resonances and reabsorption of pions as well as in the inelastic nucleon-nucleon and nucleon-resonance collisions are taken into account. The isospin diffusion in the low-density region (0.2$ρ_{0}$ - 0.8$ρ_{0}$) and high-density region (1.2$ρ_{0}$ - 1.8$ρ_{0}$) is investigated by analyzing the spectra of neutron/proton and $π^{-}/π^{+}$ ratios in the isotopic reactions of $^{132}$Sn + $^{124}$Sn and $^{108}$Sn + $^{112}$Sn at the incident energy of 270 MeV/nucleon, in which the symmetry energy manifests the opposite effect in the different density domain. The controversial conclusion of the $π^{-}/π^{+}$ ratio for constraining the high-density symmetry energy by different transport models with the FOPI data has been clarified. A soft symmetry energy with the slope parameter of $L(ρ_{0}) = 42\pm 25$ MeV by using the standard error analysis within the range of $1σ$ is obtained by analyzing the experimental data from the S$π$RIT collaboration. The neutron stars with the maximal mass of 2 $M_{\odot}$ and radius of 11-13 km are obtained with the constrained symmetry energy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_02131 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Shedding light on the pion production in heavy-ion collisions and application into the neutron star matter properties Liu, Heng-Jin Zhang, Ban Guo, Yuan-Qing Cheng, Hui-Gan Wei, Si-Na Feng, Zhao-Qing Nuclear Theory Within the framework of the quantum molecular dynamics transport model, the pion production and constraint of the high-density symmetry energy in heavy-ion collisions near threshold energy have been thoroughly investigated. The energy conservation in the decay of resonances and reabsorption of pions as well as in the inelastic nucleon-nucleon and nucleon-resonance collisions are taken into account. The isospin diffusion in the low-density region (0.2$ρ_{0}$ - 0.8$ρ_{0}$) and high-density region (1.2$ρ_{0}$ - 1.8$ρ_{0}$) is investigated by analyzing the spectra of neutron/proton and $π^{-}/π^{+}$ ratios in the isotopic reactions of $^{132}$Sn + $^{124}$Sn and $^{108}$Sn + $^{112}$Sn at the incident energy of 270 MeV/nucleon, in which the symmetry energy manifests the opposite effect in the different density domain. The controversial conclusion of the $π^{-}/π^{+}$ ratio for constraining the high-density symmetry energy by different transport models with the FOPI data has been clarified. A soft symmetry energy with the slope parameter of $L(ρ_{0}) = 42\pm 25$ MeV by using the standard error analysis within the range of $1σ$ is obtained by analyzing the experimental data from the S$π$RIT collaboration. The neutron stars with the maximal mass of 2 $M_{\odot}$ and radius of 11-13 km are obtained with the constrained symmetry energy. |
| title | Shedding light on the pion production in heavy-ion collisions and application into the neutron star matter properties |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2302.02131 |