Mathematics – Logic
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..603b&link_type=abstract
(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)
Mathematics
Logic
12
Cosmochemistry, Gamma Ray Spectra, Planetary Mapping, Planetary Surfaces, Secondary Emission, Cosmic Rays, Flux Quantization, Gamma Ray Spectrometers, Neutron Irradiation, Space Environment Simulation
Scientific paper
Cosmic rays interact with the surface of a planetary body and produce a cascade of secondary particles, such as neutrons. Neutron-induced scattering and capture reactions play an important role in the production of discrete gamma ray lines that can be measured by a gamma ray spectrometer on board an orbiting spacecraft. These data can be used to determine the concentration of many elements in the surface of a planetary body, which enables us to recognize individual geological units and provides clues to the bulk composition and in turn the origin and evolution of the body. To investigate the gamma ray fluxes induced by accelerator neutrons, experiments were carried out by irradiating thin targets with neutrons of energies from 14 MeV to 0.025 eV. Most of the gamma ray lines that are expected to be used for planetary gamma ray spectroscopy were found in the recorded spectra. This study was a first step toward a more realistic simulation of cosmic-ray-induced gamma-ray production and it indicates the importance of accelerator irradiation experiments to future planetary missions.
Brueckner Johannes
Reedy Robert C.
Waenke Heinrich
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