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

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

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977esasp.124..181d&link_type=abstract

In ESA Recent Advan. in Gamma-Ray Astronomy p 181-189 (SEE N78-11899 02-88)

Astronomy and Astrophysics

Astronomy

Apollo 15 Flight, Apollo 16 Flight, Gamma Rays, Radiation Spectra, Apollo 17 Flight, Background Radiation, Cosmic Rays, Crystals, Diffuse Radiation, Galactic Radiation, Signal To Noise Ratios

Scientific paper

Additional data obtained from the Apollo 16 and 17 missions, together with collateral calculations on background radiation effects, have made possible 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 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. A light-weight satellite design can give a fourfold improvement in the signal to noise for such a measurement. Use of an anisotropic central crystal, which spins quickly compared with possible time variations in detector background, would enable sensitive limits to be set on galactic plane and point source contributions.

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