Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964natur.204..766m&link_type=abstract
Nature, Volume 204, Issue 4960, pp. 766-767 (1964).
Astronomy and Astrophysics
Astrophysics
78
Scientific paper
THE intensity and energy distribution of radiation produced by astrophysical processes is important to an understanding of stellar evolution and the mechanism of cosmic ray production and acceleration. Previous efforts to detect a γ-ray flux have been confined to balloon and rocket flights, close to extraneous sources of radiation in the atmosphere and the radiation belts. Although measurable fluxes have been observed in such experiments, only γ-ray fluxes accompanying solar flares have been identified as extraterrestrial in origin1. In this communication, we report γ-ray measurements at distances of 7 × 104 km to 4 × 105 km from the Earth, far enough to make contributions from the Earth negligible. The experiment involved operation of a spectrometer on two flights of the Ranger spacecraft with the primary purpose of monitoring surface radiation from the Moon. Results obtained in cislunar space point to the detection of a substantial interstellar flux of γ-rays.
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