Literature DB >> 15697790

New measurement of the cosmic-ray positron fraction from 5 to 15 GeV.

J J Beatty1, A Bhattacharyya, C Bower, S Coutu, M A Duvernois, S McKee, S A Minnick, D Müller, J Musser, S Nutter, A W Labrador, M Schubnell, S Swordy, G Tarlé, A Tomasch.   

Abstract

We present a new measurement of the cosmic-ray positron fraction at energies between 5 and 15 GeV with the balloon-borne HEAT-pbar instrument in the spring of 2000. The data presented here are compatible with our previous measurements, obtained with a different instrument. The combined data from the three HEAT flights indicate a small positron flux of nonstandard origin above 5 GeV. We compare the new measurement with earlier data obtained with the HEAT-e(+/-) instrument, during the opposite epoch of the solar cycle, and conclude that our measurements do not support predictions of charge sign dependent solar modulation of the positron abundance at 5 GeV.

Year:  2004        PMID： 15697790     DOI： 10.1103/PhysRevLett.93.241102

Source DB:  PubMed          Journal:  Phys Rev Lett        ISSN： 0031-9007            Impact factor:   9.161


  1 in total

1.  An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV.

Authors:  O Adriani; G C Barbarino; G A Bazilevskaya; R Bellotti; M Boezio; E A Bogomolov; L Bonechi; M Bongi; V Bonvicini; S Bottai; A Bruno; F Cafagna; D Campana; P Carlson; M Casolino; G Castellini; M P De Pascale; G De Rosa; N De Simone; V Di Felice; A M Galper; L Grishantseva; P Hofverberg; S V Koldashov; S Y Krutkov; A N Kvashnin; A Leonov; V Malvezzi; L Marcelli; W Menn; V V Mikhailov; E Mocchiutti; S Orsi; G Osteria; P Papini; M Pearce; P Picozza; M Ricci; S B Ricciarini; M Simon; R Sparvoli; P Spillantini; Y I Stozhkov; A Vacchi; E Vannuccini; G Vasilyev; S A Voronov; Y T Yurkin; G Zampa; N Zampa; V G Zverev
Journal:  Nature       Date:  2009-04-02       Impact factor: 49.962
  1 in total

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