Cosmic ray positrons at high energies: A new measurement

S. W. Barwick; J. J. Beatty; C. R. Bower; C. Chaput; S. Coutu; G. De Nolfo; D. Ficenec; J. Knapp; D. M. Lowder; S. McKee; D. Müller; J. A. Musser; S. L. Nutter; E. Schneider; S. P. Swordy; K. K. Tang; G. Tarlé; A. D. Tomasch; E. Torbet

doi:10.1103/PhysRevLett.75.390

Cosmic ray positrons at high energies: A new measurement

S. W. Barwick, J. J. Beatty, C. R. Bower, C. Chaput, S. Coutu, G. De Nolfo, D. Ficenec, J. Knapp, D. M. Lowder, S. McKee, D. Müller, J. A. Musser, S. L. Nutter, E. Schneider, S. P. Swordy, K. K. Tang, G. Tarlé, A. D. Tomasch, E. Torbet

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Abstract

We present a new measurement of the cosmic-ray positron fraction e+/(e++e-) obtained from the first balloon flight of the High Energy Antimatter Telescope (HEAT). Using a magnet spectrometer combined with a transition radiation detector, an electromagnetic calorimeter, and time-of-flight counters we have achieved a high degree of background rejection. Our results do not indicate a major contribution to the positron flux from primary sources. In particular, we see no evidence for the significant rise in the positron fraction at energies above ∼10 GeV previously reported.

Original language	English (US)
Pages (from-to)	390-393
Number of pages	4
Journal	Physical review letters
Volume	75
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.75.390
State	Published - 1995

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.75.390

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Barwick, S. W., Beatty, J. J., Bower, C. R., Chaput, C., Coutu, S., De Nolfo, G., Ficenec, D., Knapp, J., Lowder, D. M., McKee, S., Müller, D., Musser, J. A., Nutter, S. L., Schneider, E., Swordy, S. P., Tang, K. K., Tarlé, G., Tomasch, A. D., & Torbet, E. (1995). Cosmic ray positrons at high energies: A new measurement. Physical review letters, 75(3), 390-393. https://doi.org/10.1103/PhysRevLett.75.390

@article{67d0b5fc6dc34036b2287a89332ea072,

title = "Cosmic ray positrons at high energies: A new measurement",

abstract = "We present a new measurement of the cosmic-ray positron fraction e+/(e++e-) obtained from the first balloon flight of the High Energy Antimatter Telescope (HEAT). Using a magnet spectrometer combined with a transition radiation detector, an electromagnetic calorimeter, and time-of-flight counters we have achieved a high degree of background rejection. Our results do not indicate a major contribution to the positron flux from primary sources. In particular, we see no evidence for the significant rise in the positron fraction at energies above ∼10 GeV previously reported.",

author = "Barwick, {S. W.} and Beatty, {J. J.} and Bower, {C. R.} and C. Chaput and S. Coutu and {De Nolfo}, G. and D. Ficenec and J. Knapp and Lowder, {D. M.} and S. McKee and D. M{\"u}ller and Musser, {J. A.} and Nutter, {S. L.} and E. Schneider and Swordy, {S. P.} and Tang, {K. K.} and G. Tarl{\'e} and Tomasch, {A. D.} and E. Torbet",

year = "1995",

doi = "10.1103/PhysRevLett.75.390",

language = "English (US)",

volume = "75",

pages = "390--393",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "3",

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Barwick, SW, Beatty, JJ, Bower, CR, Chaput, C, Coutu, S, De Nolfo, G, Ficenec, D, Knapp, J, Lowder, DM, McKee, S, Müller, D, Musser, JA, Nutter, SL, Schneider, E, Swordy, SP, Tang, KK, Tarlé, G, Tomasch, AD & Torbet, E 1995, 'Cosmic ray positrons at high energies: A new measurement', Physical review letters, vol. 75, no. 3, pp. 390-393. https://doi.org/10.1103/PhysRevLett.75.390

TY - JOUR

T1 - Cosmic ray positrons at high energies

T2 - A new measurement

AU - Barwick, S. W.

AU - Beatty, J. J.

AU - Bower, C. R.

AU - Chaput, C.

AU - Coutu, S.

AU - De Nolfo, G.

AU - Ficenec, D.

AU - Knapp, J.

AU - Lowder, D. M.

AU - McKee, S.

AU - Müller, D.

AU - Musser, J. A.

AU - Nutter, S. L.

AU - Schneider, E.

AU - Swordy, S. P.

AU - Tang, K. K.

AU - Tarlé, G.

AU - Tomasch, A. D.

AU - Torbet, E.

PY - 1995

Y1 - 1995

N2 - We present a new measurement of the cosmic-ray positron fraction e+/(e++e-) obtained from the first balloon flight of the High Energy Antimatter Telescope (HEAT). Using a magnet spectrometer combined with a transition radiation detector, an electromagnetic calorimeter, and time-of-flight counters we have achieved a high degree of background rejection. Our results do not indicate a major contribution to the positron flux from primary sources. In particular, we see no evidence for the significant rise in the positron fraction at energies above ∼10 GeV previously reported.

AB - We present a new measurement of the cosmic-ray positron fraction e+/(e++e-) obtained from the first balloon flight of the High Energy Antimatter Telescope (HEAT). Using a magnet spectrometer combined with a transition radiation detector, an electromagnetic calorimeter, and time-of-flight counters we have achieved a high degree of background rejection. Our results do not indicate a major contribution to the positron flux from primary sources. In particular, we see no evidence for the significant rise in the positron fraction at energies above ∼10 GeV previously reported.

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U2 - 10.1103/PhysRevLett.75.390

DO - 10.1103/PhysRevLett.75.390

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AN - SCOPUS:0011607124

SN - 0031-9007

VL - 75

SP - 390

EP - 393

JO - Physical review letters

JF - Physical review letters

IS - 3

ER -

Cosmic ray positrons at high energies: A new measurement

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