Loading...

Measurement of the atmospheric muon charge ratio by using a cosmic ray telescope

Abdollahi, S ; Sharif University of Technology | 2011

696 Viewed
  1. Type of Document: Article
  2. DOI: 10.7529/ICRC2011/V04/0749
  3. Publisher: Institute of High Energy Physics , 2011
  4. Abstract:
  5. The charge ratio of cosmic muons has important information in both "the atmospheric neutrinos anomaly" and "the hadronic interactions". We measured the muon charge ratio (Rμ = N μ+/Nμ-) in the cosmic rays flux at the momenta range 0.76-1.60 GeV/c at Sharif University of Technology in Tehran (35°43′N, 51°20′E) and 1200 m above sea level (890 gcm -2) by using a cosmic ray telescope. We used the delayed coincidence method based on reduced mean life time of negative muon due to nuclear capture in matter. By finding Rμ in different time intervals, we indicated 3 week time interval is proper to obtain Rμ and in this time interval, Rμ = 1.18±0.03. So we compared the experimental data to predictions of CORSIKA simulations using high energy interaction model (QGSJET-II) and two low energy interaction models (URQMD and GHEISHA) in the energy range from 1012 eV to 1016 eV for primary particles. We obtained Rμ=1.04 with QGSJET-URQMD models and R μ=1.06 with QGSJET-GHEISHA models. From the measurement of muons flux in different zenithal and azimuthal angles, the muon angular distribution is obtained as I(θ) = I(0) cosn θ. So the influence of the geomagnetic field leads to a dependence of the muon flux on the azimuth angle (East-West effect), in particular for low energy muons
  6. Keywords:
  7. Cosmic rays ; Extensive air shower ; Muon charge ratio ; Charged particles ; Computer simulation ; Cosmic ray measurement ; Geomagnetism ; Telescopes ; Atmospheric neutrinos ; Cosmic ray telescopes ; Delayed coincidence method ; Energy interactions ; Hadronic interactions ; Low-energy interactions
  8. Source: Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011, 11 August 2011 through 18 August 2011, Beijing ; Volume 4 , August , 2011 , Pages 30-33
  9. URL: http://inspirehep.net/record/1352415?ln=en