Atmospheric gamma-ray spectrum between 10 and 100 MeV |
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| Authors: | I N Azcárate H S Ghielmetti V J Mugherli |
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| Institution: | (1) Instituto Argentino de Radioastronomía, Villa Elisa, Provincia de Buenos Aires, Argentina;(2) Instituto de Astronomía y Física del Espacio, Buenos Aires, Argentina |
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| Abstract: | An experiment made with a baloon-borne large volume (16×16×24 cm3) omnidirectional plastic scintillator sensitive to high-energy  -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 -rays produced through interactions of the charged cosmic rays with the atmosphere. To unfold the observed pulse height spectrum and obtain the incident -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 -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.Members of the Carrera del Investigador Cientifico y Tecnológico del Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) from Argentina. |
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