12-16 September 2016
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Probing EAS primaries and their interactions by combining individual muon tracks and shower depth

14 Sep 2016, 14:00
500/1-201 - Mezzanine (CERN)

500/1-201 - Mezzanine


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Poster Contributions Cosmic rays Poster Session (coffee at 15:00) & CERN Visit


Dr Moon Moon Devi (Weizmann Institute of Science, Israel)


The current large area cosmic ray detector surface arrays typically measure only the net flux and arrival-time of the charged particles produced in an extensive air shower (EAS). Measurement of the individual charged particles at a surface array will provide additional distinguishing parameters to identify the primary and to map the very high energy interactions in the upper layers of the atmosphere. In turn these may probe anomalies in QCD interactions at energies beyond the reach of current accelerators. The recent attempts of studying the individual muon tracks are limited in their expandability to larger arrays and can only probe primary particles with energy up to about $10^{15.5}$ eV. New developments in detector technology allow for a realistic cost of large area detectors, however with limitations on energy resolutions, directional information and dynamic range. In this study, we perform a simulation study using CORSIKA to combine the energy spectrum and lateral spread of the muons with the longitudinal depth ($X_{max}$) of an EAS initiated by a primary at ultra high energies ($10^{16}$ -$10^{19}$ eV). Using proton and iron as the shower primaries, we show that the muon observables and $X_{max}$ together can be used to distinguish the primary. This study can be used to design a future detector for surface array, which will be able to enhance our knowledge of primaries and QCD interactions.


This work is on combining the information on the muon tracks and the shower depth of an extensive air shower (EAS), and to probe the primaries and their interaction. The information on muons provide additional distinguishing parameters, which are useful to probe the very high energy interactions initiating EAS.

Primary author

Dr Moon Moon Devi (Weizmann Institute of Science, Israel)

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