Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...487..415b&link_type=abstract
Astrophysical Journal v.487, p.415
Astronomy and Astrophysics
Astronomy
91
Balloons, Ism: Cosmic Rays, Elementary Particles, Sun: Activity
Scientific paper
We report on the absolute antiproton flux and the antiproton to proton ratio in the energy range 0.62--3.19 GeV at the top of the atmosphere, measured by the balloon-borne experiment CAPRICE flown from Lynn Lake, Manitoba, Canada, on 1994 August 8--9. The experiment used the New Mexico State University 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 is used together with an imaging calorimeter in a balloon experiment, and it allows antiprotons to be clearly identified over the rigidity range 1.2--4 GV. Nine antiprotons were identified in the energy range 0.62--3.19 GeV at the top of the atmosphere. The data were collected over 18 hr 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.
Barbiellini Guido
Basini Giuseppe
Bellotti Roberto
Bocciolini M.
Boezio Mirko
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