The high-energy antiproton-to-proton flux ratio with the PAMELA experiment

Bongi, Massimo; Adriani, Oscar; Bazilevskaya, G. A.; Bellotti, R.; Boezio, M.; Bogomolov, E. A.; Bonechi, L.; Bonvicini, V.; Bottai, S.; Bruno, A.; Cafagna, F.; Campana, D.; Carlson, P.; Casolino, M.; Castellini, G.; Pascalede, M. P.; Rosade, G.; De Simone, N.; Di Felice, V.; Galper, A. M.; Grishantseva, L.; Hofverberg, P.; Koldashov, S.; Krutkov, S. Y.; Kvashnin, A.; Leonov, A. A.; Malvezzi, V.; Marcelli, L.; Menn, W.; Mikhailov, V. V.; Mocchiutti, E.; Osteria, G.; Papini, P.; Pearce, M.; Picozza, P.; Ricci, M.; Ricciarini, S. B.; Simon, M.; Sparvoli, R.; Spillantini, P.; Stozhkov, Y. I.; Vacchi, A.; Vannuccini, E.; Vasiliev, G. V.; Voronov, S.; Yurkin, Y. T.; Zampa, G.; Zampa, N.; Zverev, V. G.

The PAMELA experiment is a satelliteborne apparatus designed to study charged particles in the cosmic radiation, with a particular focus on antiparticles. The detector is housed on the Resurs-DK1 satellite and it is taking data since June 2006. The main parts of the apparatus are a magnetic spectrometer, which is equipped with a silicon-microstrip tracking system and which is used to measure the rigidity and the charge of particles, and a silicon/tungsten electromagnetic calorimeter which provides particle identification. The results of the analysis of the antiproton-to-proton flux ratio between 1 and 100 GeV which employs the data collected in 500 days is presented here. A total of about 1000 antiprotons have been identified, including 100 above an energy of 20 GeV.

The high-energy antiproton-to-proton flux ratio with the PAMELA experiment / Bongi, M., Adriani, O., Barbarino, G.C., Bazilevskaya, G.A., Bellotti, R., Boezio, M., Bogomolov, E.A., Bonechi, L., Bonvicini, V., Bottai, S., Bruno, A., Cafagna, F., Campana, D., Carlson, P., Casolino, M., Castellini, G., Pascalede, M.P., Rosade, G., De Simone, N., Di Felice, V., et al.. - ELETTRONICO. - (2009), pp. 1-4. (31st International Cosmic Ray Conference, ICRC 2009 ).