1. Isospin-dependent in-medium nucleon-Delta elastic cross section.
- Author
-
Nan, Manzi, Li, Pengcheng, Wang, Yongjia, Li, Qingfeng, and Zuo, Wei
- Subjects
HEAVY-ion atom collisions ,PROPERTIES of matter ,HEAVY ion collisions ,TRANSPORT theory ,COUPLING constants ,EQUATIONS of state ,ISOBARIC spin ,ELASTIC scattering ,MESONS - Abstract
In heavy-ion collisions at intermediate energies, the production and propagation of Δ particles are crucial to understanding the nuclear equation of state and inferring the properties of nuclear matter at high densities. Based on the self-consistent relativistic Boltzmann-Uehling-Uhlenbeck (RBUU) transport theory, by introducing the isovector ρ meson exchange into the effective Lagrangian and adopting the density-dependent coupling constants, the detailed expressions for isospin-dependent in-medium N Δ → N Δ elastic cross sections σ N Δ ∗ have been calculated. The energy and density dependence of the isospin-related σ N Δ ∗ as well as the total contributions of σ , ω and ρ meson fields are analyzed. It is found that the total σ N Δ ∗ has a sensitive center-of-mass energy dependence at lower energies while exhibiting a slight increase as the center-of-mass energy increases. The isospin effect between different isospin-separated channels weakens as the energy and/or density increases. The isospin effect on the density- and energy-dependent in-medium N Δ elastic cross sections is dominantly caused by the delicate balance of the isovector ρ meson exchange. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF