摘要
本文在原来BUU方法的基础上,辨认了靶核与炮弹中的中、质子,同时在模拟核子的初始分布中考虑了小液滴模型修正,引入了表面弥散度、中子皮和形变参数等,使核子的分布更真实,这对丰中子、丰质子核反应以及非对称核反应尤为重要。考虑到中能核反应时,自由核子-核子截面中,不同核子间的散射截面大约是同类核子间散射截面的三倍的事实,在BUU碰撞项中体现了这一点,这样可合理地取出不同核子-核子间碰撞流的问题。我们在利用这个扩展的BUU模型研究44MeV/A Kr+Au反应之前,有效地检验了模型的稳定性问题,并在文中合理地定义了核子发射的条件,得到了反应过程中弹核擦碎的中子、质子数与碰撞参数的关系以及类弹类靶的关联。
On the basis of the old BUU method, the neutrons and protons of the projectile and target nucleus was distinguished, meanwhile, the droplet model which included the surface diffusion parameter, neutron skin and deformation parameter etc. was considered during simu lating original nucleon's distribution. Condersing the fact σ_(np)≈3σ_(nn)≈3σ_(pp) in interme diate energy domain, it was incorapated into the collision term of BUU. Before studying 44 MeV/A ^(86)Kr+^(197)Au reaction by the improved BUU model, the stability of the model has been checked, then the condition of nucleons emission was defined, finally the impact parameter dependence of the abraded neutrons and protons from the projectile was obtained, so was the correlation of TLF and PLF.
出处
《高能物理与核物理》
CSCD
北大核心
1992年第11期1043-1049,共7页
High Energy Physics and Nuclear Physics