Reanalysis of the Apollo cosmic gamma-ray spectrum in the 0.3 to 10 MeV energy region

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Apollo 16 Flight, Apollo 17 Flight, Cosmic Rays, Gamma Rays, Background Radiation, Bremsstrahlung, Crystals, Diffuse Radiation, Neutrons, Occultation, Radiation Detectors, Spectrum Analysis

Scientific paper

Additional data obtained from the Apollo-16 and -17 missions, together with collateral calculations on background radiation effects, have enabled an improved subtraction of unwanted backgrounds from the diffuse cosmic gamma-ray data previously reported from Apollo-15. As a result, the 1- to 10-MeV spectrum is lowered significantly and connects smoothly with recent data at other energies. The inflection reported previously is much less pronounced and has no more than a 1.5-sigma significance. Sky occultation by the Apollo-16 spacecraft shows the bulk of the 0.3- to 1-MeV radiation to be diffuse. The analysis of spurious backgrounds points to important improvements for future experiments designed for this spectral region.

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