Abstract
We present an event-by-event study of cosmic ray (CR) composition with the reflected Cherenkov light method. The fraction of CR light component above 5 PeV was reconstructed using the 2013 run data of the SPHERE experiment which observed optical Vavilov-Cherenkov radiation of extensive air showers, reflected from snow surface of Lake Baikal. Additionally, we discuss a possibility to improve the elemental groups separability by means of multidimensional criteria.
Highlights
Using a sample of model lateral distribution function (LDF), we define the criteria of the elemental groups separation for different primary energies, zenith angles and observation altitudes
The study of the superhigh energy (E > 1015eV = 1 P eV ) cosmic ray (CR) composition is the most difficult experimental problem of CR physics
We present an event-by-event study of cosmic ray (CR) composition with the reflected Cherenkov light method
Summary
Using a sample of model LDF, we define the criteria of the elemental groups separation for different primary energies, zenith angles and observation altitudes. The results of the classifier training are shown for the altitude value H= 400 m and different energies ET rig in figures 4-9. The values of the LDF steepness parameter for proton (red crosses) and Iron (blue circles) vs the primary zenith angle value θ are plotted; the boundary between the classes is shown by green straight line.
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