Observation of Cosmic Ray Positrons with the CAPRICE98 Balloon-borne Experiment

Details Observation of Cosmic Ray Positrons with the CAPRICE98 Balloon-borne Experiment Observation of Cosmic Ray Positrons with the CAPRICE98 Balloon-borne Experiment

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3...57b&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

On the 28th of May 1998 the balloon-borne experiment CAPRICE98 flew from Fort Sumner, New Mexico, USA. A completely new instrument for particle identification was added to the NMSU-WIZARD/CAPRICE98 balloon-borne magnet spectrometer: a gas ring imaging Cherenkov (RICH). This detector was the first RICH ever flown able to identify charge one particles at energies above 5 GeV. The RICH was complemented with a silicon-tungsten imaging calorimeter. Together they provided a powerful electron and positron identification achieving a proton rejection factor of 105 and better. We report here new results on the positron to electron fraction in the energy range 4 to 30 GeV.

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