Measurement of the CALIFA PETAL response to cosmic-rays and AmBe source

CALIFA is a calorimeter and spectrometer that aims to detect gamma-rays and light charged particles. It is a part of the R3B experiment at GSI and the future FAIR facility. CALIFA is divided into a cylindrical barrel and a forward end-cap. The CALIFA barrel consist of CsI(Tl) scintillating crystals, which are individually read out with Avalanche Photodiodes (APDs). The functional units for the CALIFA demonstrator are called PETALs containing 64 crystals each. The PETALs are built using the same construction procedures, materials and elements as for CALIFA. In this work, we investigated response of one CALIFA PETAL using high-energy gamma-rays from a AmBe source and atmospheric muons. In addition, we compare the experimental data with simulations using the GEANT4 package in order to verify these.