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

doi:10.1103/PhysRevLett.87.271101

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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3 Scopus citations

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 language	English (US)
Pages (from-to)	271101-271101-4
Journal	Physical review letters
Volume	87
Issue number	27
DOIs	https://doi.org/10.1103/PhysRevLett.87.271101
State	Published - Dec 31 2001

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.87.271101

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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

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

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.",

author = "Beach, {A. S.} and Beatty, {J. J.} and A. Bhattacharyya and C. Bower and S. Coutu and DuVernois, {M. A.} and Labrador, {A. W.} and S. McKee and Minnick, {S. A.} and D. M{\"u}ller and J. Musser and S. Nutter and M. Schubnell and S. Swordy and G. Tarl{\'e} and A. Tomasch",

year = "2001",

month = dec,

day = "31",

doi = "10.1103/PhysRevLett.87.271101",

language = "English (US)",

volume = "87",

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Beach, AS, Beatty, JJ, Bhattacharyya, A, Bower, C, Coutu, S, DuVernois, MA, Labrador, AW, McKee, S, Minnick, SA, 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, vol. 87, no. 27, pp. 271101-271101-4. https://doi.org/10.1103/PhysRevLett.87.271101

TY - JOUR

T1 - Measurement of the cosmic-ray antiproton-to-proton abundance ratio between 4 and 50 GeV

AU - Beach, A. S.

AU - Beatty, J. J.

AU - Bhattacharyya, A.

AU - Bower, C.

AU - Coutu, S.

AU - DuVernois, M. A.

AU - Labrador, A. W.

AU - McKee, S.

AU - Minnick, S. A.

AU - Müller, D.

AU - Musser, J.

AU - Nutter, S.

AU - Schubnell, M.

AU - Swordy, S.

AU - Tarlé, G.

AU - Tomasch, A.

PY - 2001/12/31

Y1 - 2001/12/31

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.87.271101

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JO - Physical review letters

JF - Physical review letters

IS - 27

ER -

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

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