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Chemical composition of the lunar surface from neutron leakage fluxes

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【Author】 CHENG Yu 1,2 DONG Tie-Kuang 1,2;1) DONG Wu-Dong 2 REN Zhong-Zhou 3,4 XU Ao-Ao 5 1 Space Science Institute,Macau University of Science and Technology,Avenida Wai Long,Taipa,Macau,China 2 Faculty of Information Technology,Macau University of Science and Technology,Avenida Wai Long,Taipa,Macau,China 3 Department of Physics,Nanjing University,Nanjing 210008,China 4 Center of Theoretical Nuclear Physics,National Laboratory of Heavy-Ion Accelerator,Lanzhou 730000,China 5 Macau University of Science and Technology,Avenida Wai Long,Taipa,Macau,China

【机构】 Space Science Institute,Macau University of Science and Technology,Avenida Wai Long,Taipa,Macau,China； Faculty of Information Technology,Macau University of Science and Technology,Avenida Wai Long,Taipa,Macau,China； Department of Physics,Nanjing University； Center of Theoretical Nuclear Physics,National Laboratory of Heavy-Ion Accelerator； Macau University of Science and Technology,Avenida Wai Long,Taipa,Macau,China；

【摘要】 The neutron leakage fluxes from the lunar surface are calculated by Monte Carlo transport code based on Geant4.The integral fluxes of fast neutrons,epi-thermal neutrons and thermal neutrons are analyzed.Numerical results for 20 kinds of lunar soils and 7minerals show that the fast neutron fluxes are linearly related to the average atomic mass numbers of the lunar materials used in simulations.Meanwhile,the average atomic mass numbers are strongly modulated by the abundances of iron (Fe) and titanium (Ti),and a linear relationship between the average atomic mass numbers and the abundances of Fe and Ti is found.Furthermore,the results show that the ratios of epi-thermal to thermal fluxes for lunar soils are linearly related to the macroscopic absorption cross sections of lunar materials,and that the macroscopic absorption cross sections monotonically increase with the abundances of Fe and Ti by a simple function.Then we reach the conclusion that the neutron fluxes can provide the information about the Fe and Ti contents.更多还原

【Abstract】 The neutron leakage fluxes from the lunar surface are calculated by Monte Carlo transport code based on Geant4.The integral fluxes of fast neutrons,epi-thermal neutrons and thermal neutrons are analyzed.Numerical results for 20 kinds of lunar soils and 7minerals show that the fast neutron fluxes are linearly related to the average atomic mass numbers of the lunar materials used in simulations.Meanwhile,the average atomic mass numbers are strongly modulated by the abundances of iron (Fe) and titanium (Ti),and a linear relationship between the average atomic mass numbers and the abundances of Fe and Ti is found.Furthermore,the results show that the ratios of epi-thermal to thermal fluxes for lunar soils are linearly related to the macroscopic absorption cross sections of lunar materials,and that the macroscopic absorption cross sections monotonically increase with the abundances of Fe and Ti by a simple function.Then we reach the conclusion that the neutron fluxes can provide the information about the Fe and Ti contents.更多还原

【关键词】 neutron leakage flux； Geant4； macroscopic absorption cross section；
【Key words】 neutron leakage flux； Geant4； macroscopic absorption cross section；

【基金】 Supported by Science and Technology of Development Fund of Macau (042/2007/A3)

【文献出处】中国物理C ,Chinese Physics C , 编辑部邮箱 ,2011年08期

【分类号】P184.5;O571.5
【被引频次】1
【下载频次】25

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