摘要:
基于一个相对论的BUU 方法,研究了Δ共振态的硬过程(NN→NΔ) 及软过程(Nπ→Δ) 产生截面及Δ的衰变宽度在同位旋不对称核体系下的介质修正(包括能量、密度、特别是同位旋依赖的) 效应.发现类似于核子-核子弹性散射过程,Δ硬过程产生截面的密度修正及在同位旋不对称体系下的质量劈裂效应都比较强烈,而Δ的软过程产生截面及衰变宽度的密度依赖和质量劈裂效应都相对较弱.对硬过程,其截面最大的劈裂效应出现在Δ++ 和Δ? 的产生道中,而对软过程,Δ++ 和Δ? 的产生道中的劈裂效应则最小且与硬过程的相反.
Abstract:
Within the framework of the relativistic BUU approach, we investigate the effect of energy-, density-, and especially isospin-dependent medium modifications on Δ production cross sections of both hard (NN→NΔ) and soft (Nπ→Δ) processes as well as its decay width. It is found that, similar to the nucleon-nucleon elastic scattering, the Δ production cross section from the hard process is strongly dependent on both density and the mass splitting effect in the isospin asymmetric matter. While the dependence is relative weak from the soft one, and so is the Δ decay width. Further, in the hard (soft) process, the splitting effect is largest (smallest) and of opposite sign for the Δ++ and Δ? states.
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