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PARK, Joochun
희귀 핵 연구단
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Tl concentration and its variation in a CsI(Tl) crystal for the CALIFA detector

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Title
Tl concentration and its variation in a CsI(Tl) crystal for the CALIFA detector
Author(s)
Knyazev A.; Joochun Park; Golubev P.; Pallon J.; Cederkall J.; Alvarez-Pol H.; Benlliure J.; Briz J.A.; Cabanelas P.; Casarejos E.; Cortina-Gil D.; Fernandez P.D.; Feijoo M.; Galaviz D.; Galiana E.; Borge M.J.G.; Gernhauser R.; Gonzalez D.; Gutierrez-Neira C.; Hartig A.-L.; Heinz A.; Heiss B.; Johansson H.; Klenze P.; Kroll T.; Nilsson T.; Perea A.; Ponnath L.; Rhee H.-B.; Rodriguez-Sanchez J.L.; Tengblad O.; Teubig P.
Subject
Calorimeters, ; CsI(Tl) energy resolution, ; Nuclear reactions, ; Scintillators
Publication Date
2020-09
Journal
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, v.975, pp.164197
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2020 Published by Elsevier B.V. One of the factors that can contribute to the resolution of long, doped inorganic scintillators used for nuclear spectroscopy is the variation of the dopant concentration over the length the detector crystal. In this work an investigation of such potential variations in one of the CsI(Tl) scintillators used in the calorimeter, CALIFA, of the R3B experiment at FAIR, has been performed using particle induced X-ray emission. No statistically significant gradient in doping level was found along the long axis of the investigated sample crystal and the mean value of the Tl concentration was measured to be 0.0839(38)% by weight. This corresponds to a light output of 97.3−1.7 +1.3% relative to the maximum attainable light output according to previously published work. By taking the ±1σ bounds, the 3% statistical spread in the relative light output provides a good reference value of the minimum light-output non-uniformity observed for the CALIFA crystals. If the relative light output is estimated pointwise from a set of Tl concentration measurements a light-output non-uniformity of 4.6(2.4)% results. For a γ-ray energy of 662 keV the deduced variation in Tl concentration contributes with 0.48(6)% to the typical resolution of 7.74(6)% measured with a collimated source along the crystal main axis. The result is of interest for the characterization of the detector system performance and for realistic simulations of the light collection process in detector systems that are used for nuclear spectroscopy and calorimetry
URI
https://pr.ibs.re.kr/handle/8788114/7666
DOI
10.1016/j.nima.2020.164197
ISSN
0168-9002
Appears in Collections:
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
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