In-medium NN→NΔ cross section and its dependence on effective Lagrange parameters in isospin-asymmetric nuclear matter * * Supported by National Natural Science Foundation of China (11875323, 11875125, 11475262, 11365004, 11375062, 11790323, 11790324, 11790325) and the National Key R&D Program of China (2018 YFA0404404)

Abstract

The in-medium cross sections and its differential cross sections in isospin asymmetric nuclear medium are investigated in the framework of the one-boson exchange model by including isovector mesons, i.e., and mesons. Our results show that the in-medium cross sections are suppressed when the density increases, and the differential cross sections become isotropic with an increase in the density around the threshold energy. The isospin splitting on the medium correction factor, is observed for different channels of , especially around the threshold energy for all the effective Lagrangian parameters. By analyzing the selected effective Lagrangian parameters, our results show that the larger effective mass is, the weaker medium correction is.