Event Structure in Collider and Cosmic Ray Experiments

  • N. Yamdagni


Hadronic interactions have been studied in cosmic ray experiments for a long time, and many of the important discoveries were made in those experiments. With the development of accelerators, systematic study of hadronic interactions have been carried out with beams of selected type of particles of well defined energies. Every new step towards higher energy has restricted the scope of cosmic ray experiments. The fact that cosmic rays are the source of highest available energy has been an important motivation for continuing the study of hadronic interactions at higher and higher energies with modified or new experiments. Figure 1 shows the energy regions covered by different cosmic ray techniques. Also indicated are the energy regions covered by ISR and the CERN SPS \(p\bar p\) collider. Cosmic ray experiments have two important limitations. Firstly, the energy and the type of cosmic ray particles cannot be controlled; and, secondly, the flux of primary cosmic rays falls off very rapidly with increasing energy. Figure 2 shows the integral flux of primary cosmic rays in the energy region 1012 eV – 1020 eV. In the face of these limitations, the efforts to cover higher energies lead to larger detectors or fewer events or going over to a new technique which provides more indirect information.


Hadronic Interaction Charged Multiplicity Hadronic Shower Emulsion Chamber Average Charged Multiplicity 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • N. Yamdagni
    • 1
  1. 1.Institute of PhysicsUniversity of StockholmStockholmSweden

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