同位旋非对称核物质中$\mbox{NN}\to \mbox{N}Δ$截面及其对有效Lagrange参数的依赖性
In-medium $\mbox{NN}\to \mbox{N}Δ$ cross section and its dependence on effective Lagrange parameters in isospin-asymmetric nuclear matter
摘要：
在单玻色子交换模型的框架下，考虑等矢量介子，研究了同位旋非对称核介质中的介质内$NN\rightarrow NΔ$截面及其微分截面，$δ$和$ρ$介子。结果表明，在$Δ$阈值能量附近，介质中$NN\rightarrow NΔ$截面随密度的增加而减小，微分截面随密度的增加而各向同性.对于$NN\to NΔ$的不同通道，特别是在所有有效拉格朗日参数的阈值能量附近，观察到介质校正因子$R=σ_{ NN\rightarrow NΔ}^*/σ_{NN\rightarrow NΔ}^{\text{free}}$上的Isosin分裂。通过对所选取的有效拉格朗日参数的分析，我们的结果表明，有效质量越大，介质修正$R$越弱。
英文摘要：
The in-medium $NN\rightarrow NΔ$ cross section and its differential cross section in isospin asymmetric nuclear medium are investigated in the framework of the one-boson exchange model by including the isovector mesons, i.e., $δ$ and $ρ$ mesons. Our results show that the in-medium $NN\rightarrow NΔ$ cross sections are suppressed with density increasing, and the differential cross sections become isotropic with the density increasing at the beam energy around the $Δ$ threshold energy. The isospin splitting on the medium correction factor, $R=σ_{ NN\rightarrow NΔ}^*/σ_{NN\rightarrow NΔ}^{\text{free}}$ is observed for different channels of $NN\to NΔ$, 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 $R$ is.
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