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

S. Ota, L. Sihver, S. Kobayashi, Nobuyuki Hasebe

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    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.

    Original languageEnglish
    Pages (from-to)2114-2121
    Number of pages8
    JournalAdvances in Space Research
    Issue number10
    Publication statusPublished - 2014 Nov 15



    • Cosmic rays
    • High energy nuclear data
    • Lunar and planetary spectroscopy
    • Moon
    • Neutron density
    • PHITS

    ASJC Scopus subject areas

    • Aerospace Engineering
    • Space and Planetary Science

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