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https://hdl.handle.net/2440/17873
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Type: | Journal article |
Title: | A study of the composition of ultra-high-energy cosmic rays using the high-resolution fly's eye |
Author: | Abbasi, R. Abu-Zayyad, T. Archbold, G. Atkins, R. Bellido Caceres, J. Belov, K. Belz, J. BenZvi, S. Bergman, D. Boyer, J. Burt, G. Cao, Z. Clay, R. Connolly, B. Dawson, B. Deng, W. Fedorova, Y. Findlay, J. Finley, C. Hanlon, W. et al. |
Citation: | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2005; 622(2):910-926 |
Publisher: | Univ Chicago Press |
Issue Date: | 2005 |
ISSN: | 0004-637X 1538-4357 |
Statement of Responsibility: | R. U. Abbasi, T. Abu-Zayyad, G. Archbold, R. Atkins, J. Bellido, K. Belov, J. W. Belz, S. BenZvi, D. R. Bergman, J. Boyer, G. W. Burt, Z. Cao, R. Clay, B. M. Connolly, B. Dawson, W. Deng, Y. Fedorova, J. Findlay, C. B. Finley, W. F. Hanlon, G. A. Hughes, P. Huntemeyer, C. C. H. Jui, K. Kim, M. A. Kirn, B. Knapp, E. C. Loh, M. M. Maetas, K. Martens, G. Martin, N. Manago, E. J. Mannel, J. A. J. Matthews, J. N. Matthews, A. O'Neill, L. Perera, K. Reil, R. Riehle, M. D. Roberts, M. Sasaki, M. Seman, S. R. Schnetzer, K. Simpson, J. D. Smith, R. Snow, P. Sokolsky, C. Song, R. W. Springer, B. T. Stokes, J. R. Thomas, S. B. Thomas, G. B. Thomson, S. Westerhoff, L. R. Wiencke and A. Zech |
Abstract: | The composition of ultra high-energy cosmic rays is measured with the High Resolution Fly's Eye cosmic-ray observatory data using the Xmax technique. Data were collected in stereo between 1999 November and 2001 September. The data are reconstructed with well-determined geometry. Measurements of the atmospheric transmission are incorporated in the reconstruction. The detector resolution is found to be 30 g cm-2 in Xmax and 13% in energy. The Xmax elongation rate between 1018.0 and 1019.4 eV is measured to be 54.5 ± 6.5 (stat) ± 4.5 (sys) g cm-2 per decade. This is compared with predictions using the QGSJet01 and SIBYLL 2.1 hadronic interaction models for both protons and iron nuclei. CORSIKA-generated extensive air showers are incorporated directly into a detailed detector Monte Carlo program. The elongation rate and the Xmax distribution widths are consistent with a constant or slowly changing and predominantly light composition. A simple model containing only protons and iron nuclei is compared with QGSJet and SIBYLL. The best agreement between the model and the data is for 80% protons for QGSJet and 60% protons for SIBYLL. |
Keywords: | acceleration of particles cosmic rays large-scale structure of universe |
Description: | © 2005. The American Astronomical Society |
DOI: | 10.1086/427931 |
Published version: | http://dx.doi.org/10.1086/427931 |
Appears in Collections: | Aurora harvest 6 Physics publications |
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