Watanabe Y, Kadrev D N
Department of Advanced Energy Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan.
Radiat Prot Dosimetry. 2007;126(1-4):40-4. doi: 10.1093/rpd/ncm010. Epub 2007 May 22.
A quantum molecular dynamics (QMD) simulation is applied to light-ion production in neutron-induced reactions on O, Si and Fe at E(n) = 96 MeV. The generalized evaporation model (GEM) is used to account for statistical decay processes after the QMD stage. Good agreement with the experimental energy spectra is obtained for proton emission, but the calculation exhibits remarkable underestimation for pre-equilibrium emission of light clusters, i.e. d, t, (3)He and (4)He. It is found that the underestimation is improved except in the region around the high energy end of the emission spectra by implementation of a phenomenological coalescence model into the QMD under the assumption that these light clusters are formed in the nuclear surface region by a leading nucleon that is ready to leave the nucleus.
应用量子分子动力学（QMD）模拟研究了能量为E(n)=96 MeV的中子与氧、硅和铁发生反应时产生轻离子的情况。采用广义蒸发模型（GEM）描述QMD阶段之后的统计衰变过程。对于质子发射，计算结果与实验能谱吻合良好，但对于轻核团簇（即氘、氚、氦-3和氦-4）的预平衡发射，计算结果明显偏低。研究发现，在假设这些轻核团簇是由准备离开原子核的领头核子在核表面区域形成的前提下，通过在QMD中引入一个唯象的聚合模型，除了发射能谱高能端附近区域外，计算结果偏低的情况得到了改善。
