Experimental determination of the spectrum of gamma photons in the atmosphere at 12 GV geomagnetic cutoff

Details Experimental determination of the spectrum of gamma photons in the atmosphere at 12 GV geomagnetic cutoff Experimental determination of the spectrum of gamma photons in the atmosphere at 12 GV geomagnetic cutoff

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rbrfi...5..139m&link_type=abstract

Revista Brasileira de Fisica, vol. 5, Aug. 1975, p. 139-152. In French.

Physics

Background Radiation, Balloon-Borne Instruments, Gamma Rays, Geomagnetism, Stratosphere Radiation, X Ray Spectra, Atmospheric Pressure, Monte Carlo Method, Radiant Flux Density, Radiation Detectors, Scintillation Counters

Scientific paper

The paper analyzes data on the gamma-ray photon flux between 0.9 and 18.0 MeV as a function of altitude obtained in two stratospheric balloon flights. Cutoff rigidity was 12 GV. A 4-inch by 4-inch NaI(Tl) crystal detector encapsulated in a 1-cm thick plastic scintillator operating in anticoincidence was used. Above 20 g per sq cm, the differential spectrum could be represented by a power law with exponent 1.0 plus or minus 0.1, independently of altitude. From 20 to 760 g per sq cm the spectrum was steeper, with spectral index of 1.3 plus or minus 0.1. At 3.5 g per sq cm, the gamma-ray flux was 0.30 photons per sq cm sec. The measurements permit determination of the background noise of cosmic gamma radiation.

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