Gamma-ray lines observed in balloon flights at high rigidity

Details Gamma-ray lines observed in balloon flights at high rigidity Gamma-ray lines observed in balloon flights at high rigidity

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..64..339b&link_type=abstract

Astrophysics and Space Science, vol. 64, no. 2, Aug. 1979, p. 339-346.

Computer Science

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2

Balloon Sounding, Cosmic Rays, Gamma Ray Spectra, Line Spectra, Annihilation Reactions, Balloon-Borne Instruments, Brazil, Flux (Rate), Radiant Flux Density, Stratosphere

Scientific paper

Gamma-ray lines at 0.511 MeV and 1.632 MeV have been observed at high rigidity (12.5 GV), and up to 4 g/sq cm during stratospheric balloon flights launched from Sao Jose dos Campos, Brazil. The flux of these lines is compared with the results obtained at other rigidity regions. The intensity variations of the most prominent of these lines, the annihilation line at 0.511 MeV, is found to be compatible, at various atmospheric depths, with theoretical predictions. This study has led to the estimation of an upper limit for the flux of the extraterrestrial 0.511 MeV gamma-ray line.

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