Extension of quantum molecular dynamics for production of light complex particles in nucleon-induced reactions
Extension of quantum molecular dynamics for production of light complex particles in nucleon-induced reactions
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DOI：
10.1051/ndata:07196
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Y. Watanabe;D. N. Kadrev
中科院分区：
文献类型：
--
作者：
Y. Watanabe;D. N. Kadrev
将量子分子动力学(QMD)模型应用于几个轻核和中重核的核子诱导反应中产生轻带电粒子。用广义蒸发模型(GEM)研究了QMD阶段末期高激发态碎片的统计衰变过程。核子发射与实验双微分截面符合得很好，但对于d、t、3He和4He等轻复杂粒子的平衡前发射，计算结果却明显偏低。为了改善这种情况，在QMD模拟中引入了唯象表面聚结模型，假设轻的复杂粒子主要是在动力学过程中准备逃逸出核的领先核子在表面区附近形成的。
A quantum molecular dynamics (QMD) model is applied to production of light charged particles in nucleon-induced reactions on several light and medium heavy nuclei. The generalized evaporation model (GEM) is used to deal with the statistical decay process of highly excited fragments at the end of the QMD stage. Good agreement with experimental double-differential cross sections is obtained for nucleon emission, but the calculation shows remarkable underprediction for preequilibrium emission of light complex particles, i.e., d, t, 3 He, and 4 He. To improve the situation, a phenomenological surface coalescence model is incorporated into the QMD simulation under the assumption that light complex particles are mainly formed near the surface region by a leading nucleon that is ready to escape from the nucleus during the dynamical process.