A new measurement of the cosmic-ray antiproton-to-proton flux ratio between 1 and 100 GeV is presented. The results were obtained with the PAMELA experiment, which was launched into low-Earth orbit on-board the Resurs-DK1 satellite on June 15th 2006. During 500 days of data collection a total of about 1000 antiprotons have been identified, including 100 above an energy of 20 GeV. The high-energy results are a tenfold improvement in statistics with respect to all previously published data. The data follow the trend expected from secondary production calculations and significantly constrain contributions from exotic sources, e. g., dark matter particle annihilations.

New Measurement of the Antiproton-to-Proton Flux Ratio up to 100 GeV in the Cosmic Radiation / O. Adriani;G. C. Barbarino;G. A. Bazilevskaya;R. Bellotti;M. Boezio;E. A. Bogomolov;L. Bonechi;M. Bongi;V. Bonvicini;S. Bottai;A. Bruno;F. Cafagna;D. Campana;P. Carlson;M. Casolino;G. Castellini;M. P. De Pascale;G. D. Rosa;D. Fedele;A. M. Galper;L. Grishantseva;P. Hofverberg;A. Leonov;S. V. Koldashov;S. Y. Krutkov;A. N. Kvashnin;V. Malvezzi;L. Marcelli;W. Menn;V. V. Mikhailov;M. Minori;E. Mocchiutti;M. Nagni;S. Orsi;G. Osteria;P. Papini;M. Pearce;P. Picozza;M. Ricci;S. B. Ricciarini;M. Simon;R. Sparvoli;P. Spillantini;Y. I. Stozhkov;E. Taddei;A. Vacchi;E. Vannuccini;G. Vasilyev;S. A. Voronov;Y. T. Yurkin;G. Zampa;N. Zampa;V. G. Zverev. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 102:(2009), pp. 051101-051101. [10.1103/PhysRevLett.102.051101]

New Measurement of the Antiproton-to-Proton Flux Ratio up to 100 GeV in the Cosmic Radiation

ADRIANI, OSCAR;BONECHI, LORENZO;BONGI, MASSIMO;SPILLANTINI, PIERO;
2009

Abstract

A new measurement of the cosmic-ray antiproton-to-proton flux ratio between 1 and 100 GeV is presented. The results were obtained with the PAMELA experiment, which was launched into low-Earth orbit on-board the Resurs-DK1 satellite on June 15th 2006. During 500 days of data collection a total of about 1000 antiprotons have been identified, including 100 above an energy of 20 GeV. The high-energy results are a tenfold improvement in statistics with respect to all previously published data. The data follow the trend expected from secondary production calculations and significantly constrain contributions from exotic sources, e. g., dark matter particle annihilations.
102
051101
051101
O. Adriani;G. C. Barbarino;G. A. Bazilevskaya;R. Bellotti;M. Boezio;E. A. Bogomolov;L. Bonechi;M. Bongi;V. Bonvicini;S. Bottai;A. Bruno;F. Cafagna;D. Campana;P. Carlson;M. Casolino;G. Castellini;M. P. De Pascale;G. D. Rosa;D. Fedele;A. M. Galper;L. Grishantseva;P. Hofverberg;A. Leonov;S. V. Koldashov;S. Y. Krutkov;A. N. Kvashnin;V. Malvezzi;L. Marcelli;W. Menn;V. V. Mikhailov;M. Minori;E. Mocchiutti;M. Nagni;S. Orsi;G. Osteria;P. Papini;M. Pearce;P. Picozza;M. Ricci;S. B. Ricciarini;M. Simon;R. Sparvoli;P. Spillantini;Y. I. Stozhkov;E. Taddei;A. Vacchi;E. Vannuccini;G. Vasilyev;S. A. Voronov;Y. T. Yurkin;G. Zampa;N. Zampa;V. G. Zverev
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/394362
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