Depth dependency of neutron density produced by cosmic rays in the lunar subsurface
Journal article, 2014

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/cm(2) 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.


Neutron density

Lunar and planetary spectroscopy

High energy nuclear data

Cosmic rays



S. Ota

Japan Atomic Energy Agency

Waseda University

Lembit Sihver

Chalmers, Applied Physics, Nuclear Engineering

Shinji Kobayashi

National Institute of Radiological Sciences

N. Hasebe

Waseda University

Advances in Space Research

0273-1177 (ISSN)

Vol. 54 10 2114-2121

Subject Categories

Astronomy, Astrophysics and Cosmology



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