Average mass of primary cosmic rays in the knee energy region inferred from Tibet experiment

THE TIBET ASγ COLLABORATION

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Study of the chemical composition of cosmic rays in the knee region has been made by the Tibet ASγ Collaboration using the Tibet-III air shower array and an air-shower-core detector. Based on the data of all-particle spectrum, proton, and helium spectra obtained by Tibet hybrid experiment, upper and lower limits of the average mass number of primary cosmic rays were estimated in the energy interval between 1015eV and 1016eV assuming unmeasured components (all − proton − helium) are any mixture of nuclei between carbon and iron. The lower limit of hln Ai with carbon model is approximately 2 and the upper limit with iron model is approximately 3.5 with weak energy dependences. The systematic errors involved in estimating hln Ai due to the primary energy determination or the interaction model dependence in deriving the flux of each nuclear element are discussed and found to be small enough to set the boundary for hln Ai. A comparison of our result with recent Icecube data suggests that the primary mass composition is dominated by carbon at 1015 eV and it tends to be dominated by iron at 1016 eV.

Original languageEnglish
Title of host publicationProceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
PublisherSociedade Brasileira de Fisica
Volume2013-October
ISBN (Electronic)9788589064293
Publication statusPublished - 2013 Jan 1
Event33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil
Duration: 2013 Jul 22013 Jul 9

Other

Other33rd International Cosmic Rays Conference, ICRC 2013
CountryBrazil
CityRio de Janeiro
Period13/7/213/7/9

Keywords

  • Chemical composition
  • Knee
  • Tibet hybrid experiment

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    THE TIBET ASγ COLLABORATION (2013). Average mass of primary cosmic rays in the knee energy region inferred from Tibet experiment. In Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 (Vol. 2013-October). Sociedade Brasileira de Fisica.