Probing in-medium effect via giant dipole resonance in the extended quantum molecular dynamics model
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911463569883136 |
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| author | Shi, Chen-Zhong Cai, Xiang-Zhou Ma, Yu-Gang |
| author_facet | Shi, Chen-Zhong Cai, Xiang-Zhou Ma, Yu-Gang |
| contents | Rather than using the geometric method employed in the original Extended Quantum Molecular Dynamics (EQMD) model, this article employs a stochastic approach to analyze the collision term and examine the width of the isovector giant dipole resonance (GDR) in ${}^{208}$Pb. Based on the ``soft" EQMD model, which we recently developed, the response and strength functions are self-consistently determined for various symmetry energy coefficients and in-medium reduction factor values. The results confirm that the peak position and GDR width in ${}^{208}$Pb are highly sensitive to the symmetry energy and the in-medium nucleon-nucleon ({\it NN}) cross section. This provides an opportunity to study the nuclear equation of state (EoS) and the medium effect. A significant reduction in free {\it NN} elastic cross sections within the medium is necessary to accurately reproduce the GDR width, as demonstrated by a comparison with the evaluation data. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_17432 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing in-medium effect via giant dipole resonance in the extended quantum molecular dynamics model Shi, Chen-Zhong Cai, Xiang-Zhou Ma, Yu-Gang Nuclear Theory Nuclear Experiment Rather than using the geometric method employed in the original Extended Quantum Molecular Dynamics (EQMD) model, this article employs a stochastic approach to analyze the collision term and examine the width of the isovector giant dipole resonance (GDR) in ${}^{208}$Pb. Based on the ``soft" EQMD model, which we recently developed, the response and strength functions are self-consistently determined for various symmetry energy coefficients and in-medium reduction factor values. The results confirm that the peak position and GDR width in ${}^{208}$Pb are highly sensitive to the symmetry energy and the in-medium nucleon-nucleon ({\it NN}) cross section. This provides an opportunity to study the nuclear equation of state (EoS) and the medium effect. A significant reduction in free {\it NN} elastic cross sections within the medium is necessary to accurately reproduce the GDR width, as demonstrated by a comparison with the evaluation data. |
| title | Probing in-medium effect via giant dipole resonance in the extended quantum molecular dynamics model |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2508.17432 |