Depth dependency of neutron density produced by cosmic rays in the lunar subsurface |
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| Authors: | S Ota L Sihver S Kobayashi N Hasebe |
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| Institution: | 1. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, Japan;2. Research Institute for Science and Engineering, Waseda University, Tokyo, Japan;3. Chalmers University of Technology, SE-412 96 Goteborg, Sweden;4. University of Houston, Houston, TX 77204-5005, USA;5. Texas A & M University, College Station, TX 77843-3133, USA;6. East Carolina University, Greenville, NC 27858, USA;g Royal Military College, Kingston, Ontario K7K 7B4, Canada;h Medical College of Soochow University, 215123 Suzhou, Jiangsu Province, China;i Roanoke College, Salem, VA 24153, USA;j National Institute of Radiological Sciences, Chiba, Japan |
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| Abstract: | Depth dependency of neutrons produced by cosmic rays (CRs) in the lunar subsurface was estimated using the three-dimensional Monte Carlo particle and heavy ion transport simulation code, PHITS, incorporating the latest high energy nuclear data, JENDL/HE-2007. The PHITS simulations of equilibrium neutron density profiles in the lunar subsurface were compared with the measurement by Apollo 17 Lunar Neutron Probe Experiment (LNPE). Our calculations reproduced the LNPE data except for the 350–400 mg/cm2 region under the improved condition using the CR spectra model based on the latest observations, well-tested nuclear interaction models with systematic cross section data, and JENDL/HE-2007. |
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| Keywords: | Neutron density Cosmic rays Lunar and planetary spectroscopy Moon PHITS High energy nuclear data |
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