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The light output produced by light ions (Z<=4) in CsI(Tl) crystals is studiedover a wide range of detected energies (E<=300 MeV). Energy-light calibrationdata sets are obtained with the 10 cm crystals in the recently upgradedHigh-Resolution Array (HiRA10). We use proton recoil data from 40,48Ca + CH2 at28 MeV/u, 56.6 MeV/u, 39 MeV/u and 139.8 MeV/u and data from a dedicatedexperiment with direct low-energy beams. We also use the punch through pointsof p, d, and t particles from 40,48Ca + 58,64Ni, 112,124Sn collisions reactionsat 139.8 MeV/u. Non-linearities, arising in particular from Tl doping and lightcollection efficiency in the CsI crystals, are found to significantly affectthe light output and therefore the calibration of the detector response forlight charged particles, especially the hydrogen isotopes. A new empiricalparametrization of the hydrogen light output, L(E,Z=1,A), is proposed toaccount for the observed effects. Results are found to be consistent for all 48CsI(Tl) crystals in a cluster of 12 HiRA10 telescopes.

Non-linearity effects on the light-output calibration of light charged particles in CsI(Tl) scintillator crystals