Shahmohammadi Beni Mehrdad, Hau Tak Cheong, Krstic D, Nikezic D, Yu K N
Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong, China.
Faculty of Science, University of Kragujevac, Kragujevac,Serbia.
PLoS One. 2017 Jul 13;12(7):e0181281. doi: 10.1371/journal.pone.0181281. eCollection 2017.
Monte Carlo method was used to study the characteristics of neutron interactions with cells underneath a water medium layer with varying thickness. The following results were obtained. (1) The fractions of neutron interaction with 1H, 12C, 14N and 16O nuclei in the cell layer were studied. The fraction with 1H increased with increasing medium thickness, while decreased for 12C, 14N and 16O nuclei. The bulges in the interaction fractions with 12C, 14N and 16O nuclei were explained by the resonance spikes in the interaction cross-section data. The interaction fraction decreased in the order: 1H > 16O > 12C > 14N. (2) In general, as the medium thickness increased, the number of "interacting neutrons" which exited the medium and then further interacted with the cell layer increased. (3) The area under the angular distributions for "interacting neutrons" decreased with increasing incident neutron energy. Such results would be useful for deciphering the reasons behind discrepancies among existing results in the literature.
采用蒙特卡罗方法研究了中子与不同厚度水介质层下细胞相互作用的特性。得到了以下结果。(1) 研究了细胞层中中子与1H、12C、14N和16O原子核的相互作用份额。与1H的相互作用份额随介质厚度增加而增加，而与12C、14N和16O原子核的相互作用份额则下降。与12C、14N和16O原子核相互作用份额中的凸起现象可由相互作用截面数据中的共振峰来解释。相互作用份额按以下顺序降低：1H > 16O > 12C > 14N。(2) 一般来说，随着介质厚度增加，离开介质后再与细胞层进一步相互作用的“相互作用中子”数量增加。(3) “相互作用中子”角分布的面积随入射中子能量增加而减小。这些结果将有助于解释文献中现有结果之间差异背后的原因。
