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Tl concentration and its variation in a CsI(Tl) crystal for the CALIFA detector

Authors :
Håkan T Johansson
D. Cortina-Gil
Pavel Golubev
B. Heiss
C. Gutierrez-Neira
M. J. G. Borge
Enrique Casarejos
A.-L. Hartig
R. Gernhäuser
Jan Pallon
A. Knyazev
José Antonio Briz
P. Díaz Fernández
Joakim Cederkäll
M. Feijoo
Joochun Park
P. Klenze
Thomas Nilsson
H. Alvarez-Pol
David Porrinas González
J. L. Rodriguez-Sanchez
L. Ponnath
P. Teubig
D. Galaviz
Andreas Martin Heinz
T. Kröll
Ángel Perea
P. Cabanelas
E. Galiana
H. B. Rhee
Olof Tengblad
J. Benlliure
Swedish Research Council
Federal Ministry of Education and Research (Germany)
Consejo Superior de Investigaciones Científicas (España)
Ministerio de Economía y Competitividad (España)
Ministerio de Ciencia, Innovación y Universidades (España)
German Research Foundation
Xunta de Galicia
Source :
Digital.CSIC. Repositorio Institucional del CSIC, instname
Publication Year :
2020
Publisher :
Elsevier, 2020.

Abstract

9 pags., 6 figs.<br />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 RB 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 % 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.<br />This work was supported by the Swedish research council (VR) grants 2017-03986, 2014-06644, 2013-04178, 2012-04550, BMBF contracts 05P15WOFNA, 05P19WOFN1, 05P15RDFN1, 05P19RDFN1, the TU Darmstadt – GSI cooperation contract HIC for FAIR, by the Spanish National Research Council, Spain grants FPA02015-64969-P (MINDECO/FEDER/EU), FPA2015-69640-C2-1-P, PGC2018-099746-B-C21, MDM-2016.0692 (MINECO/FEDER/EU) and by GRC, Germany ED431C 2017/54 (Xunta de Galicia/FEDER/EU).

Details

Database :
OpenAIRE
Journal :
Digital.CSIC. Repositorio Institucional del CSIC, instname
Accession number :
edsair.doi.dedup.....b55ec6e777828f78ce1296678b910a38