Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.m1206s&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #M12.06
Physics
Scientific paper
We report on the absolute antiproton flux and the antiproton to proton ratio in the energy range 0.62 to 3.19 GeV at the top of the atmosphere, measured by the balloon-borne experiment CAPRICE flown from Lynn Lake, Manitoba, Canada, on August 8-9, 1994. The experiment used the NMSU-WiZard/CAPRICE balloon-borne magnet spectrometer equipped with a solid radiator Ring Imaging CHerenkov (RICH) detector and a silicon-tungsten calorimeter for particle identification. This is the first time a RICH has been used with an imaging calorimeter in a balloon experiment, and it allowed antiprotons to be clearly identified over the rigidity range 1.2 to 4 GV/c. Nine antiprotons were identified in the energy range from 0.62 to 3.19 GeV at the top of the atmosphere. The data were collected over 18 hours at a mean residual atmosphere of 3.9 g/cm^2. The absolute antiproton flux is consistent with a pure secondary production of antiprotons during the propagation of cosmic rays in the Galaxy.
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