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.

The cosmic-ray antiproton flux between 0.62 AND 3.19 GeV measured near solar minimum activity / Boezio, M; Carlson, P; Francke, T; Weber, N; Suffert, M; Hof, M; Menn, W; Simon, M; Stephens, Sa; Bellotti, R; Cafagna, F; Castellano, Marcello; Circella, M; Decataldo, G; Demarzo, C; Giglietto, Nicola; Spinelli, P; Bocciolini, M; Papini, P; Perego, A; Piccardi, S; Spillantini, P; Basini, G; Ricci, M; Codino, A; Finetti, N; Grimani, C; Candusso, M; Casolino, M; Depascale, Mp; Morselli, A; Picozza, P; Sparvoli, R; Barbiellini, G; Bravar, U; Schiavon, P; Vacchi, A; Zampa, N; Mitchell, Jw; Ormes, Jf; Streitmatter, Re; Golden, Rl; Stochaj, Sj. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 487:1(1997), pp. 415-423. [10.1086/304593]

The cosmic-ray antiproton flux between 0.62 AND 3.19 GeV measured near solar minimum activity

CASTELLANO, Marcello;GIGLIETTO, Nicola;
1997-01-01

Abstract

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.
1997
The cosmic-ray antiproton flux between 0.62 AND 3.19 GeV measured near solar minimum activity / Boezio, M; Carlson, P; Francke, T; Weber, N; Suffert, M; Hof, M; Menn, W; Simon, M; Stephens, Sa; Bellotti, R; Cafagna, F; Castellano, Marcello; Circella, M; Decataldo, G; Demarzo, C; Giglietto, Nicola; Spinelli, P; Bocciolini, M; Papini, P; Perego, A; Piccardi, S; Spillantini, P; Basini, G; Ricci, M; Codino, A; Finetti, N; Grimani, C; Candusso, M; Casolino, M; Depascale, Mp; Morselli, A; Picozza, P; Sparvoli, R; Barbiellini, G; Bravar, U; Schiavon, P; Vacchi, A; Zampa, N; Mitchell, Jw; Ormes, Jf; Streitmatter, Re; Golden, Rl; Stochaj, Sj. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - STAMPA. - 487:1(1997), pp. 415-423. [10.1086/304593]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/1161
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