Speaker
Description
We have simulated the Telescope Array FADC fluorescence detecter and surface detector array dataset up till 11/2018 with CORSIKA generated MC sets using three high-energy interaction models: QGSJetII-04, EPOS-LHC, and Sibyll 2.3d, and with four separate nuclear species for each model: H, He, N and Fe. The simulation includes detector response characteristics both of the surface detector, done using GEANT4, and for the fluorescence detectors, using ray-tracing, atmospheric attenuation and trigger simulation. Using the model/species data in energy bins, we created template Xmax distributions, and used these templates to find the fractions of each species that best match the hybrid data for each model. The fractional fit was performed using a Markov Chain MC method which allows sampling of the likelihood space of the fractions. We present the fractions for each model and show the correlations between the fit fractions.
