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oai:docta.ucm.es:20.500.14352/241342024-09-06T17:41:55Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Vedia Fernández, María Victoria author Mach Henryk, Andrzej author Fraile Prieto, Luis Mario author Udías Moinelo, José Manuel author Lalkovski, S. 2023-06-18T06:46:31Z 2023-06-18T06:46:31Z 2015-09-21 0168-9002 10.1016/j.nima.2015.05.058 https://hdl.handle.net/20.500.14352/24134 http://dx.doi.org/10.1016/j.nima.2015.05.058 http://www.sciencedirect.com/http://arxiv.org/abs/1506.03044 We have characterized in depth the time response of three detectors equipped with cylindrical LaBr_3(Ce) crystals with dimensions of 1-in. in height and 1-in. in diameter, and having nominal Ce doping concentration of 5%, 8% and 10%. Measurements were performed at Co-60 and Na-22 gamma-ray energies against a fast BaF2 reference detector. The time resolution was optimized by the choice of the photomultiplier bias voltage and the fine tuning of the parameters of the constant fraction discriminator, namely the zero-crossing and the external delay. We report here on the optimal time resolution of the three crystals. It is observed that timing properties are influence('by the amount of Ce doping and the crystal homogeneity. For the crystal with 8% of Ce doping the use of the ORTEC 935 CFD at very shorts delays in addition to the Hamamatsu R9779 PMT has made it possible to improve the LaBr3(Ce) time resolution from the best literature value at Co-60 photon energies to below 100 ps. (C) 2015 Elsevier B.V. All rights reserved. eng Enhanced time response of 1-in. LaBr_3(Ce) crystals by leading edge and constant fraction techniques journal article URL https://docta.ucm.es/bitstreams/59a220dc-21f4-4d8e-868e-20cd45476475/download File MD5 2e59bf745b8618c62ef06913775ade6d 561464 application/pdf Fraile Prieto 05 preprint.pdf URL https://docta.ucm.es/bitstreams/a2969fbc-e805-4473-98af-e54888b35fd9/download File MD5 49af4f0a5549c05025b9a97e8000529c 44877 text/plain Fraile Prieto 05 preprint.pdf.txt