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 350–400mg/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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    Title :

    Depth dependency of neutron density produced by cosmic rays in the lunar subsurface


    Contributors:
    Ota, S. (author) / Sihver, L. (author) / Kobayashi, S. (author) / Hasebe, N. (author)

    Published in:

    Advances in Space Research ; 54 , 10 ; 2114-2121


    Publication date :

    2014-02-01


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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