Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.8110a&link_type=abstract
American Astronomical Society Meeting 207, #81.10; Bulletin of the American Astronomical Society, Vol. 37, p.1302
Other
Scientific paper
The results of two experiments carried out with a large volume balloon-borne omnidirectional plastic scintillator sensitive to 10-100 MeV gamma-radiation are reported here. The two balloons were flown on 18 November 1990 and 24 February 1992, at places of 11.1 and 11.5 GV geomagnetic cut-off rigidities, respectively. For an omnidirectional detector and for energies greater than several MeV, most of the detected photons are secondary γ -rays produced through interactions of the charged cosmic rays with the atmosphere. To unfold the observed pulse height spectrum and obtain the incident γ -ray spectrum, the detector response function is calculated with some simplifying assumptions. By using this response function, a differential flux dJ/dE=E{-1.2 ± 0.2} photons cm-2 s-1 MeV-1, averaged over all zenithal angles, is estimated for the atmospheric γ -radiation, at an atmospheric depth of 5 g cm-2, in the 10-100 Mev energy range. This flux turns out to be compatible with other observations.
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