Calculation of the wide-angle neutron spectra from the ~9Be(d,xn) reaction in a thick beryllium target  

作　　者：Zheng Wei Jun-Run Wang Ya-Ling Zhang Zhi-Wu Huang Zhan-Wen Ma Jie Zhang Yan-Yan Ding Li Xia Jian-Yi Li Xiao-Long Lu Yu Zhang Da-Peng Xu Lei Yang Ze-En Yao 韦峥;王俊润;张雅玲;黄智武;马占文;张杰;丁琰琰;夏莉;李建一;卢小龙;张宇;徐大鹏;杨磊;姚泽恩(School of Nuclear Science and Technology, Lanzhou University;Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University;Institute of Modern Physics, Chinese Academy of Sciences)

机构地区：[1]School of Nuclear Science and Technology, Lanzhou University [2]Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University [3]Institute of Modern Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2019年第5期29-34,共6页中国物理C（英文版）

基　　金：Supported by the National Magnetic Confinement Fusion Science Program of China(2014GB104002);the National Natural Science Foundation of China(11705071,11875155,11675069,21327801);NSAF(U1830102);the National Key Scientific Instrument and Equipment Development Project(2013YQ40861);the Fundamental Research Funds for the Central Universities(lzujbky-2017-13,lzujbky-2017-kb09)

摘　　要：The multi-layer computing model is developed to calculate wide-angle neutron spectra, in the range from0° to 180° with a 5° step, produced by bombarding a thick beryllium target with deuterons. The double-differential cross-sections(DDCSs) for the ~9 Be(d, xn) reaction are calculated using the TALYS-1.8 code. They are in agreement with the experimental data, and are much better than the PHITS-JQMD/GEM results at 15°, 30°, 45° and 60° neutron emission angles for deuteron energy of 10.0 MeV. In the TALYS-1.8 code, neutron contributions from direct reactions(break-up, stripping and knock-out reactions) are controlled by adjustable parameters, which describe the basic characteristics of typical direct reactions and control the relative intensity and the position of the ridgy hillock at the tail of DDCSs. It is found that the typical calculated wide-angle neutron spectra for different neutron emission angles and neutron angular distributions agree quite well with the experimental data for 13.5 MeV deuterons. The multi-layer computing model can reproduce the experimental data reasonably well by optimizing the adjustable parameters in the TALYS-1.8 code. Given the good agreement with the experimental data, the multi-layer computing model could provide better predictions of wide-angle neutron energy spectra, neutron angular distributions and neutron yields for the ~9 Be(d, xn) reaction neutron source.The multi-layer computing model is developed to calculate wide-angle neutron spectra, in the range from0° to 180° with a 5° step, produced by bombarding a thick beryllium target with deuterons. The double-differential cross-sections(DDCSs) for the ~9 Be(d, xn) reaction are calculated using the TALYS-1.8 code. They are in agreement with the experimental data, and are much better than the PHITS-JQMD/GEM results at 15°, 30°, 45° and 60° neutron emission angles for deuteron energy of 10.0 MeV. In the TALYS-1.8 code, neutron contributions from direct reactions(break-up, stripping and knock-out reactions) are controlled by adjustable parameters, which describe the basic characteristics of typical direct reactions and control the relative intensity and the position of the ridgy hillock at the tail of DDCSs. It is found that the typical calculated wide-angle neutron spectra for different neutron emission angles and neutron angular distributions agree quite well with the experimental data for 13.5 MeV deuterons. The multi-layer computing model can reproduce the experimental data reasonably well by optimizing the adjustable parameters in the TALYS-1.8 code. Given the good agreement with the experimental data, the multi-layer computing model could provide better predictions of wide-angle neutron energy spectra, neutron angular distributions and neutron yields for the ~9 Be(d, xn) reaction neutron source.

关 键 词：NEUTRON source 9Be(d xn) REACTION THICK TARGET WIDE-ANGLE NEUTRON spectra NEUTRON angular distributions 

分 类 号：O4[理学—物理]