Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.190..317a&link_type=abstract
Astrophysics and Space Science, Volume 190, Issue 2, pp.317-329
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
An experiment made with a baloon-borne large volume (16×16×24 cm3) omnidirectional plastic scintillator sensitive to high-energy γ-radiation is described. Two flights were carried out on 25 November, 1973 and 24 February, 1978 at high geomagnetic cut-off rigidities. 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 numerically. By using this response function a differential flux dJ/dE=(0.33±0.1)E -1.2±0.2 photons cm-2 s-1 MeV-1 averaged over all zenith angles, is estimated for the atmospheric γ-radiation, at 5 g cm-2, in the 10 100 MeV energy range. This result is compared with other observations made with different types of detectors and at different geomagnetic latitudes.
Azcarate I. N.
Ghielmetti H. S.
Mugherli V. J.
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