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

We present a new measurement of the antiproton-to-proton abundance ratio, p/p, in the cosmic radiation. The HEAT-pbar instrument, a balloon borne magnet spectrometer with precise rigidity and multiple energy loss measurement capability, was flown successfully in Spring 2000, at an average atmospheric depth of 7.2g/cm2. A total of 71 antiprotons were identified above the vertical geomagnetic cutoff rigidity of 4.2 GV. The highest measured proton energy was 81 GeV. We find that the p/p abundance ratio agrees with that expected from a purely secondary origin of antiprotons produced by primary protons with a standard soft energy spectrum.

Original languageEnglish (US)
Pages (from-to)271101-271101-4
JournalPhysical Review Letters
Volume87
Issue number27
DOIs
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), 271101-271101-4. https://doi.org/10.1103/PhysRevLett.87.271101