Properties of the CsI(Tl) detector elements of the CALIFA detector

Summary, in English

In the RB experiment at FAIR, charged particles with energies up to 600 MeV and forward boosted -rays with energies up to 20 MeV need to be detected in scattering experiments. Calorimeters for nuclear physics experiments of this kind, using relativistic radioactive ion beams, require high energy resolution and high efficiency for simultaneous detection of strongly Doppler shifted -rays and high-energy charged particles. A calorimeter design that can meet these requirements, using CsI(Tl) scintillators, results in detector elements that may exhibit light output variations with crystal depth, which can limit the attainable resolution. In this paper we present results from a systematic study of 478 detector modules of CALIFA, the RB calorimeter, in order to determine and minimize such variations. To facilitate further systematic studies we also present results for the total absorption length of the scintillation light, using spectrophotometry, light crosstalk between adjacent detector modules, and surface topography of the CsI(Tl) crystals from atomic force microscopy.

• Author: Alexander Knyazev; Joochun Park; Pavel Golubev; Joakim Cederkäll; H Alvarez-Pol; P. Cabanelas; Enrique Casarejos; L. Causeret; D Cortina-Gil; P. Diaz Fernandez; M. Feijoo; D. Galaviz; E. Galiana; R. Gernhäuser; A. Hartig; A Heinz; B. Heiss; A. Ignatov; H. T. Johansson; P. Klenze; T. Kröll; T Nilsson; A. Perea; H. B. Rhee; O Tengblad; P. Teubig
• Department/s: Nuclear physics
• Publishing year: 2019
• Language: English
• Pages: 393-404
• Publication/Series: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
• Volume: 940
• Links: http://dx.doi.org/10.1016/j.nima.2019.06.045
• Document type: Journal article
• Publisher: Elsevier
• Topic: Accelerator Physics and Instrumentation
• Status: Published
• ISBN/ISSN/Other: ISSN: 0168-9002