Investigation of light output uniformity improvement in dual-end readout CsI(Tl) scintillator bars

Résumé fourni par la source

Inverse-kinematics charge-exchange experiments with radioactive ion beams require compact detector systems with good particle identification capability and high energy resolution for recoil charged particles emitted at large angles. In a recently developed TPC-CsI(Tl) Δ E - E telescope for the inverse-kinematics ( 3 He, t ) reaction, the performance of long CsI(Tl) scintillator bars is limited by light collection non-uniformity (LCNU) caused by scintillation-photon attenuation. In this work, a dual-end readout scheme for CsI(Tl) bars is proposed and investigated. Geant4-based Monte Carlo simulations are performed to study photon transport and collection in single-end and dual-end readout configurations, showing that the LCNU is reduced from 18.19% to 4.30% with improved light-collection efficiency. Experimental tests using cosmic ray muons further confirm the effectiveness of the dual-end readout, achieving LCNU below 6% for most crystals. These results demonstrate that dual-end readout provides a practical and effective solution to mitigate intrinsic non-uniformity in long CsI(Tl) bars and significantly improve the energy resolution and overall performance of CsI(Tl)-based detector systems.

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