Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977esasp.124..323c&link_type=abstract
In ESA Recent Advan. in Gamma-Ray Astronomy p 323-325 (SEE N78-11899 02-88)
Astronomy and Astrophysics
Astronomy
Background Radiation, Cosmic X Rays, Diffuse Radiation, Gamma Rays, Radiation Detectors, Anisotropy, Crystals, Galactic Radiation
Scientific paper
Limits can be set to the applications of intrinsically nondirectional detectors. It appears that they are basically due to the inability of these instruments to determine experimentally the diffuse background, the crystal background, and the spurious background produced in the surrounding matter (such as a collimator). In a previous paper the analysis was performed for a number of simplified experimental arrangements in which this statement could be proved. More complex situations were analyzed finding as yet no exception. Considering background anisotropy measurements making use of shaped crystal detectors, it is shown that it is impossible to determine by means of a flat disk crystal the first two coefficients of the expansion of the celestial background into spherical harmonics of the appropriate angles, thus reducing the effectiveness of this method. A different arrangement is therefore suggested.
Cavallo Giacomo
Horstman H. M.
Moretti-Horstman E.
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