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Measurement of primary cosmic-ray electrons and positrons from 4 to 50 GeV (1975)

Buffington, A. ; Orth, C. D. ; Smoot, G. F.

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Publication Date: 2019-06-27

Description: We have used a bremsstrahlung-identification technique to measure electron and positron spectra in the primary cosmic rays from 4 to 50 GeV. Above our average geomagnetic cutoff of 4.0 GV/c, we find fluxes of 4.4 (plus or minus 0.3) electrons and 0.37 (plus or minus 0.09 positrons) per sq m/sr/sec. The electron events follow a differential power law whose spectral index is 2.8 (plus or minus 0.1). Our ratio electrons/(electrons + positrons) = 0.08 (plus or minus 0.02) implies traversal of an equivalent slab thickness of 4.3 (plus or minus 1.5) g/sq cm of interstellar and source material.

Keywords: SPACE RADIATION

Type: Astrophysical Journal; 199; Aug. 1

Format: text

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