Speaker
Description
Development of a clover-like LaBr3(Ce) detector module
S. Dutta, C. Cassells, B.S. Nara Singh, M. Bowry, D. O’Donnell, M. Scheck, J.F. Smith
University of the West of Scotland, UK
P. Joshi, J. Bordes, J.R. Brown, D.G. Jenkins
University of York, York, UK
O. Tengblad, J.A. Briz, M.J.G. Borge
Instituto de Estructura de la Materia, CSIC,Spain
This work explores the application of clover-like LaBr3(Ce) detector modules to gamma-ray spectroscopy. The crystals are directly coupled to Silicon Photomultipliers (SiPMs), therefore, they are compact, more portable and usable in environments of high magnetic fields [1]. For the first time, the SiPMs are directly coupled to the bare crystals without any other intermediate layer. This new type of construction improves the resolution by more than 0.5% compared to devices such as those used in Ref. [1] where commercially available canned crystals are coupled to SiPMs. In addition, the clover geometry allows for the add-back method to improve spectral quality [2]. This approach applied to germanium detectors was known to minimise Compton background, although the Full Width at Half Maximum (FWHM) of observed gamma-ray peaks show some increase [3-5]. However, such a detriment has not been observed for the clover-like LaBr3(Ce) detector module and FWHM stayed unaltered in any significant manner. On the other hand, the peak-to-total (P/T) ratio is greatly improved (for example, 33% for Cs-137) due to the application of the add-back technique. During the workshop, some results using the standard gamma-ray sources will be presented. Furthermore, the use of this module, with higher efficiency than that of germanium detectors, in nuclear astrophysical setups will be mentioned.
[1] C. Mihai et al. “Development of large area Silicon Photomultipliers arrays for 𝛾-ray spectroscopy applications”, Nuclear Inst. and Methods in Physics Research, A 953 (2020) 163263.
[2] (Give G. Duchene et al..” The Clover: a new generation of composite Ge detectors
“ etc… see https://web-docs.gsi.de/~wolle/INDIA/IUAC-2007/PAPERS/NIMA432_90.pdf)
[3] P.K.Joshi, H.C.Jain, A.S.Medhi, S.Chattopadhyayay, Nuclear Inst. and Methods in Physics Research, A 399 (1997) 51.
[4] G.J Schmid, et al., Nuclear Inst. and Methods in Physics Research, A 422 (1999) 368.
[5] B.S. Nara Singh et al. “Characteristics of a two-fold Segmented clover detector”, Nuclear Inst. and Methods in Physics Research, A 506 (2003) 238249.
