Measurement of the cosmic-ray antiproton-to-proton abundance ratio between 4 and 50 GeV

A. S. Beach, J. J. Beatty, A. Bhattacharyya, C. Bower, S. Coutu, M. A. Duvernois, A. W. Labrador, S. McKee, S. A. Minnick, D. Müller, J. Musser, S. Nutter, M. Schubnell, S. Swordy, G. Tarlé, A. Tomasch

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Abstract

A study on the measurement of the antiproton-to-proton abundance ratio in the cosmic radiation was performed. The HEAT-pbar instrument, a balloon magnet spectrometer was flown successfully in Spring 2000. It was observed that 71 antiprotons were identified above the vertical geomagnetic cutoff rigidity of 4.2 GV. The antiproton-to-proton ratio was found to be agreed with that expected from a purely secondary origin of antiprotons produced by primary protons with a standard soft energy spectrum.

Original languageEnglish (US)
Article number271101
Pages (from-to)2711011-2711014
Number of pages4
JournalPhysical Review Letters
Volume87
Issue number27 I
StatePublished - Dec 31 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Beach, A. S., Beatty, J. J., Bhattacharyya, A., Bower, C., Coutu, S., Duvernois, M. A., Labrador, A. W., McKee, S., Minnick, S. A., Müller, D., Musser, J., Nutter, S., Schubnell, M., Swordy, S., Tarlé, G., & Tomasch, A. (2001). Measurement of the cosmic-ray antiproton-to-proton abundance ratio between 4 and 50 GeV. Physical Review Letters, 87(27 I), 2711011-2711014. [271101].