Diffuse cosmic gamma-ray background in the 28 keV-4.1 MeV range from Kosmos 461 observations

Details Diffuse cosmic gamma-ray background in the 28 keV-4.1 MeV range from Kosmos 461 observations Diffuse cosmic gamma-ray background in the 28 keV-4.1 MeV range from Kosmos 461 observations

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..33..347m&link_type=abstract

Astrophysics and Space Science, vol. 33, Apr. 1975, p. 347-357.

Astronomy and Astrophysics

Astrophysics

29

Background Radiation, Cosmic Rays, Cosmos Satellites, Gamma Rays, Atmospheric Radiation, Data Reduction, Diffuse Radiation, Energy Spectra, Radiant Flux Density, Satellite Observation, Satellite-Borne Instruments, Spectrum Analysis

Scientific paper

Diffuse cosmic background and atmospheric gamma-radiation in the range 28 keV-4.1 MeV were studied with a scintillation spectrometer on board of the Kosmos 461 satellite. Separation of the cosmic and atmospheric components was made possible through a reliable determination of the geomagnetic dependences of albedo gamma-radiation. The spectrum of diffuse background in the energy range covered cannot be fitted with a common law. At energies below 400 keY the spectrum follows a power-law I = (5.6 ± 0.5) x 1O~ E-(2so±o05) cm2 s' sr1 MeV1. Starting from 400 keY, this power-law breaks down; the spectrum revealing a clearly pronounced shoulder. Extrapolation of the power-law spectrum to higher energies shows that the gamma-ray component responsible for the change in the shape of the spectrum is quite strong, becoming predo- minant in the diffuse background in the range 1-100 MeV. The intensity of excess radiation is maxi- mum in the region of 700-800 keY reaching 1.8 x 10-2 cm2 s1 sr' MeV `.The shape of the high energy component spectrum of the diffuse background constructed using the data of Kosmos 461 and SAS-2 is in agreement with the hypotheses of the cosmological origin of the radiation

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