Measurement of the positron to electron ratio in the cosmic rays above 5 GeV.

Details Measurement of the positron to electron ratio in the cosmic rays above 5 GeV. Measurement of the positron to electron ratio in the cosmic rays above 5 GeV.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mpte.book......&link_type=abstract

Measurement of the positron to electron ratio in the cosmic rays above 5 GeV., by . Ist. Naz. Fis. Nucl., Trieste (Italy), Dec

Computer Science

Scientific paper

As part of a series of experiments to search for antimatter in cosmic rays, the NMSU balloon-borne magnet spectrometer was configured for a flight to study positrons. Two completely new instruments, a transition radiation detector and a silicon-tungsten imaging calorimeter, were added to the magnetic spectrometer. These two detectors provided a proton rejection factor better than 3×104. The authors report the measured fraction of positrons e+/e++e- from about 5 to 60 GeV at the top of the atmosphere. Their measurements do not show any compelling evidence for an increase in this ratio with energy and the results are consistent with a constant fraction of 0.078±0.016 over the entire energy region.

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