Effects of mean-field momentum dependence on pion production in intermediate-energy heavy-ion collisions
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911317852422144 |
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| author | Li, Xin Wang, Si-Pei Zhang, Zhen Wang, Rui Pu, Jie Ma, Chun-Wang Chen, Lie-Wen |
| author_facet | Li, Xin Wang, Si-Pei Zhang, Zhen Wang, Rui Pu, Jie Ma, Chun-Wang Chen, Lie-Wen |
| contents | Pion production in heavy-ion collisions at intermediate energies provides an important probe of the collision dynamics and nuclear matter equation of state, especially the high-density behavior of the symmetry energy. Using the lattice Boltzmann-Uehling-Uhlenbeck transport model with a recently developed nuclear effective interaction based on the so-called N$5$LO Skyrme pseudopotential, we investigate the effects of the momentum dependence of nucleon mean-field potentials on the pion production in Au+Au collisions at a beam energy of $1.23$~GeV/nucleon. We find that a stronger momentum dependence, for which the nucleon mean-field potentials increase faster with momentum, generally suppresses pion production. This feature can be understood in terms of the mean-field-induced modification of nucleon high-momentum phase space during the compression stage: a stronger momentum dependence can reduce the relative fraction of high-momentum nucleons in heavy-ion collisions, thereby suppressing the production of $Δ$ resonances and pions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_21099 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Effects of mean-field momentum dependence on pion production in intermediate-energy heavy-ion collisions Li, Xin Wang, Si-Pei Zhang, Zhen Wang, Rui Pu, Jie Ma, Chun-Wang Chen, Lie-Wen Nuclear Theory High Energy Physics - Phenomenology Nuclear Experiment Pion production in heavy-ion collisions at intermediate energies provides an important probe of the collision dynamics and nuclear matter equation of state, especially the high-density behavior of the symmetry energy. Using the lattice Boltzmann-Uehling-Uhlenbeck transport model with a recently developed nuclear effective interaction based on the so-called N$5$LO Skyrme pseudopotential, we investigate the effects of the momentum dependence of nucleon mean-field potentials on the pion production in Au+Au collisions at a beam energy of $1.23$~GeV/nucleon. We find that a stronger momentum dependence, for which the nucleon mean-field potentials increase faster with momentum, generally suppresses pion production. This feature can be understood in terms of the mean-field-induced modification of nucleon high-momentum phase space during the compression stage: a stronger momentum dependence can reduce the relative fraction of high-momentum nucleons in heavy-ion collisions, thereby suppressing the production of $Δ$ resonances and pions. |
| title | Effects of mean-field momentum dependence on pion production in intermediate-energy heavy-ion collisions |
| topic | Nuclear Theory High Energy Physics - Phenomenology Nuclear Experiment |
| url | https://arxiv.org/abs/2509.21099 |