Measurement of the Positron to Electron Ratio in the Cosmic Rays above 5 GeV
- R. L. Golden
- S. J. Stochaj
- S. A. Stephens
- F. Aversa
- G. Barbiellini
- M. Boezio
- U. Bravar
- A. Colavita
- F. Fratnik
- P. Schiavon
- A. Vacchi
- N. Zampa
- J. W. Mitchell
- J. F. Ormes
- R. E. Streitmatter
- R. Bellotti
- F. Cafagna
- M. Castellano
- M. Circella
- G. De Cataldo
- C. De Marzo
- N. Giglietto
- B. Marangelli
- A. Raino'
- P. Spinelli
- M. Bocciolini
- N. Finetti
- P. Papini
- A. Perego
- S. Piccardi
- P. Spillantini
- G. Basini
- F. Massimo Brancaccio
- M. Ricci
- M. T. Brunetti
- A. Codino
- GRIMANI, CATIA
- M. Menichelli
- V. Bidoli
- M. Candusso
- M. Casolino
- M. P. De Pascale
- A. Morselli
- P. Picozza
- R. Sparvoli
- M. Hof
- W. Menn
- M. Simon
DOIAbstract
As part of a series of experiments to search for antimatter in cosmic rays, the New Mexico State University balloon-borne magnet spectrometer was configured for a flight to study positrons. Two completely new instruments, a transition radiation detector and a silicon-tungsten imaging calorimeter, were added to the magnet spectrometer. These two detectors provided a proton rejection factor better than 3 × 104. This instrument was flown from Fort Sumner, New Mexico, at an average depth of 4.5 g cm-2 of residual atmosphere for a period of 25 hr. We report here the measured fraction of positrons e+/(e+ + e-) from ~5 to 60 GeV at the top of the atmosphere. Our measurements do not show any compelling evidence for an increase in this ratio with en...
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