Speaker
Description
TThe ratio $Y(\pi^-)/Y(\pi^+)$ ($\pi^-/\pi^+$) of the yields of the different charge states of $\pi$ is considered an important observable for determining the symmetry energy density in the high-density region. However, there remains much controversy in using it to constrain the resulting symmetry energy. This requires us to further explore the physical mechanisms associated with the production of $\pi$, i.e., the in-medium $\Delta$ and $\pi$ production and propagation, which are the foundation for reliable determination of the symmetry energy in the future.
In this report, we will show the in-medium $\Delta$ related inelastic scattering in isospin asymmetric nuclear matter in frame work of the one-boson exchange model. $\Delta$ and isovector mesons, i.e., $\rho$, $\delta$ are included in order to reasonable describing the isospin asymmetric nuclear matter. Based on this model, we will perform the systemically study on in-medium $NN \to N\Delta$ , $N\Delta \to NN$ , $N\pi \to \Delta$ cross section and $\Delta \to N\pi$ decay width.
