An observation of cosmic ray positrons from 10-20 GeV

Details An observation of cosmic ray positrons from 10-20 GeV An observation of cosmic ray positrons from 10-20 GeV

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....2..378m&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 2 p 378-381 (SEE N85-34006 22-93)

Physics

Nuclear Physics

Cosmic Rays, Energy Spectra, Magnetic Rigidity, Negatrons, Positrons, Balloon Flight, Flux Density, Geomagnetism, Interstellar Matter, Nuclei (Nuclear Physics), Particle Telescopes

Scientific paper

A balloon flight of the University of Chicago electron telescope was performed. Making use of the east-west asymmetry in the geomagnetic cut off rigidity, the cosmic ray positrons and negatrons were separated over the range 10 GeV to 20 GeV. The positron to electron ratio, e+/(e++e-), was measured to be 17% + or - 5%, significantly higher than the ratio measured in the 1 GeV to 10 GeV range by other experiments. This increase appears to suggest that either a primary component of positrons become significant above 10 GeV, or that the spectrum of primary negatrons decreases above 10 GeV more sharply than that of secondary positrons.

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