A Balloon-Borne measurement of atmospheric gamma-rays at energies between 10 and 100 MeV carried out at high geomagnetic cut-off rigidities

Details A Balloon-Borne measurement of atmospheric gamma-rays at energies between 10 and 100 MeV carried out at high geomagnetic cut-off rigidities A Balloon-Borne measurement of atmospheric gamma-rays at energies between 10 and 100 MeV carried out at high geomagnetic cut-off rigidities

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.0605a&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #06.05; Bulletin of the American Astronomical Society, Vol. 32, p.1193

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Scientific paper

The results of two experiments carried out with a large volume balloon-borne omnidirectional plastic scintillator sensitive to high-energy gamma-radiation are reported here. The flights were carried out 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 gamma-rays produced through interactions of the charged cosmic rays with the atmosphere. To unfold the observed pulse-height spectrum and obtain the incident gamma-ray spectrum, the detector response is calculated numerically with some simplifying assumptions. By using this response function a differential flux dJ/dE=E{-1.2+/- 0.2}photons.cm-2.s-1MeV-1, averaged over all zenith angles, is estimated for the atmospheric gamma-ray radiation, at an atmospheric depth of 5 g.cm-2, in the 10-100 MeV energy range. That flux results to be compatible with other observations made with different types of detectors and at different geomagnetic cut-offs.

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