The positron annihilation line at 511 keV in the upper atmosphere

Details The positron annihilation line at 511 keV in the upper atmosphere The positron annihilation line at 511 keV in the upper atmosphere

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6658a&link_type=abstract

Journal of Geophysical Research, vol. 84, Nov. 1, 1979, p. 6658-6662. Centre National d'Etudes Spatiales

Physics

1

Atmospheric Radiation, Positron Annihilation, Upper Atmosphere, Balloon Flight, Calibrating, Earth Albedo, High Resolution, Photons

Scientific paper

Results are presented for a series of balloon flights made at two latitudes over Aire sur l'Adour, France (4.5 GV), and Sao Jose dos Campos, Brazil (12.5 GV). Two types of omnidirectional detector were used: a 4.5 x 5.1 cm NaI crystal and a 23-cu cm Ge-Li high-energy-resolution detector. The two were surrounded by a 0.8-cm-thick plastic anticoincidence scintillator. These measurements made it possible to determine precisely the characteristics of the 0.511-MeV line versus altitude and latitude. From the analysis of the growth curves at the two latitudes an extraterrestrial component value of 0.043 plus or minus 0.015 photon/sq cm-sec is determined, along with an upper limit of 0.004 photon/sq cm-sec for the flux from the Galactic Center region

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