Reaction Losses of Charged Particles in CsI(Tl) crystals

TL;DR

This paper develops a method to measure and correct for reaction and scattering losses in CsI(Tl) detectors used for charged particle detection, improving accuracy in high-energy particle measurements.

Contribution

It introduces a new correction method for reaction and scattering losses in CsI(Tl) detectors and validates it with experimental data and GEANT4 simulations.

Findings

Measured efficiencies agree with GEANT4 predictions.

Derived a general function for reaction loss efficiency based on particle range.

Validated correction method improves detection accuracy.

Abstract

To efficiently detect energetic light charged particles, it is common to use arrays of energy-loss telescopes involving two or more layers of detection media. As the energy of the particles increases, thicker layers are usually needed. However, carrying out measurements with thick-telescopes may require corrections for the losses due to nuclear reactions induced by the incident particles on nuclei within the detector and for the scattering of incident particles out of the detector, without depositing their full energy in the active material. In this paper, we develop a method for measuring such corrections and determine the reaction and out-scattering losses for data measured with the silicon-CsI(Tl) telescopes of the newly developed HiRA10 array. The extracted efficiencies are in good agreement with model predictions using the GEANT4 reaction loss algorithm for Z=1 and Z=2 isotopes. After correcting for the HiRA10 geometry, a general function that describes the efficiencies from the reaction loss in CsI(Tl) crystals as a function of range is obtained.