Investigation of the neutron-proton effective mass splitting via heavy ion collisions: Constraints and Implications
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912444181381120 |
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| author | Yang, Junping Sun, Meiqi Cui, Ying Liu, Yangyang Li, Zhuxia Zhao, Kai Zhang, Yingxun |
| author_facet | Yang, Junping Sun, Meiqi Cui, Ying Liu, Yangyang Li, Zhuxia Zhao, Kai Zhang, Yingxun |
| contents | The neutron-proton effective mass splitting ($Δm^*_{np}$) is investigated through analyses of heavy-ion collisions using the improved quantum molecular dynamics (ImQMD) model with both standard and extended Skyrme interactions. By uncovering the strong correlation between the slope of the neutron-to-proton yield ratio with respect to the kinetic energy (i.e., $S_{n/p} $) and $Δm^*_{np}$, we reveal that the constraints of the neutron-proton effective mass splitting via heavy ion collisions depend on the kinetic energy region of the emitted nucleons. At low kinetic energies, the data favor $m_n^*>m_p^*$ which is consistent with the nucleon-nucleus scattering analysis, while at high kinetic energies, they favor $m_n^*<m_p^*$. Our findings partly resolve the longstanding discrepancy in the constraints of neutron-proton effective mass splitting with heavy ion collisions and nucleon-nucleus scattering, and significantly advance the understanding of nucleon effective mass splitting through heavy ion collisions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_17973 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigation of the neutron-proton effective mass splitting via heavy ion collisions: Constraints and Implications Yang, Junping Sun, Meiqi Cui, Ying Liu, Yangyang Li, Zhuxia Zhao, Kai Zhang, Yingxun Nuclear Theory Nuclear Experiment The neutron-proton effective mass splitting ($Δm^*_{np}$) is investigated through analyses of heavy-ion collisions using the improved quantum molecular dynamics (ImQMD) model with both standard and extended Skyrme interactions. By uncovering the strong correlation between the slope of the neutron-to-proton yield ratio with respect to the kinetic energy (i.e., $S_{n/p} $) and $Δm^*_{np}$, we reveal that the constraints of the neutron-proton effective mass splitting via heavy ion collisions depend on the kinetic energy region of the emitted nucleons. At low kinetic energies, the data favor $m_n^*>m_p^*$ which is consistent with the nucleon-nucleus scattering analysis, while at high kinetic energies, they favor $m_n^*<m_p^*$. Our findings partly resolve the longstanding discrepancy in the constraints of neutron-proton effective mass splitting with heavy ion collisions and nucleon-nucleus scattering, and significantly advance the understanding of nucleon effective mass splitting through heavy ion collisions. |
| title | Investigation of the neutron-proton effective mass splitting via heavy ion collisions: Constraints and Implications |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2506.17973 |