In-medium nucleon-nucleon cross sections from relativistic <i>ab initio</i> calculations

Tianyu Wang; Hui Tong; Chencan Wang; Xiaoying Qu; Sibo Wang

doi:10.1103/2cn8-s9ss

In-medium nucleon-nucleon cross sections from relativistic ab initio calculations

Tianyu Wang ¹, Hui Tong ², Chencan Wang ³, Xiaoying Qu ^1,*, and Sibo Wang ^4,†

¹School of Physics and Mechatronic Engineering, Guizhou Minzu University, Guiyang 550025, China
²Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, Bonn D-53115, Germany
³Graduate School of China Academy of Engineering Physics, Beijing 100193, China
⁴Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China

^*Contact author: xiaoyingqu@126.com
^†Contact author: sbwang@cqu.edu.cn

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Phys. Rev. C 112, 054322 – Published 25 November, 2025

DOI: https://doi.org/10.1103/2cn8-s9ss

Abstract

The in-medium nucleon-nucleon scattering cross section is a pivotal quantity for studying the medium effects of strong interaction, and its precise knowledge is critical for understanding the equation of state for dense matter, intermediate-energy heavy-ion collision dynamics, and related phenomena. In this work, we perform a microscopic investigation of in-medium nucleon-nucleon scattering cross sections, by utilizing the relativistic Brueckner-Hartree-Fock (RBHF) theory with the Bonn potential. The fully incorporation of both positive- and negative-energy states in the RBHF solutions allows us to determine the single-particle potentials, the effective $G$ matrix, and the scattering cross section uniquely. The momentum, density, and isospin dependence of the cross section for $p p$ , $n n$ , and $n p$ scattering are studied in detail. Our results provide a solid foundation for future parametrization studies of multiparameter dependency of total scattering cross sections.

Physical Review C

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In-medium nucleon-nucleon cross sections from relativistic ab initio calculations

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In-medium nucleon-nucleon cross sections from relativistic ab initio calculations

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