Two annular CsI(Tl) detector arrays for the charged particle telescopes

In this study, we constructed two annular detector arrays comprising 24 wedge-shaped CsI(Tl) crystals, and tested them using an α source and radioactive beams of ^14-16 C on a CD _2 target. We compared the properties of a CsI(Tl) crystal encapsulated with various reflectors, revealing that using the 80- m-thick ESR film to pack the CsI(Tl) crystal yielded the largest light output with the smallest non-uniformity in light output ( Δ LO ). For the 24 CsI(Tl) detectors with the 80- m-thick ESR films, the average energy resolution improved as the average light output increased; however, it deteriorated as the Δ LO value increased. To form two annular Si-CsI(Tl) telescopes for identifying the light-charged particles, the Δ LO value and energy resolution of each CsI(Tl) detector were maintained under 20