Enhanced time response of 1-in. LaBr_3(Ce) crystals by leading edge and constant fraction techniques



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Vedia Fernandez, Victoria and Mach Henryk, Andrzej and Fraile Prieto, Luis Mario and Udías Moinelo, José Manuel and Lalkovski, S. (2015) Enhanced time response of 1-in. LaBr_3(Ce) crystals by leading edge and constant fraction techniques. Nuclear instruments & methods in physics research. Section A, Accelerators spectrometers detectors and associated equipment, 795 . pp. 144-150. ISSN 0168-9002

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Official URL: http://dx.doi.org/10.1016/j.nima.2015.05.058


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.

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© 2015 Elsevier B.V.
This work was partially supported by the Spanish MINECO through Projects FPA2010-17142, FPA2013-41267-P and Consolider-CPAN CSD-2007-00042. Funding by the ERA-NET NuPNET via Spanish Project PRI-PIMNUP-2011-1338 (FATIMA-NuPNET) and Bulgarian Project DNS7RP01-4 (FATIMA-NuPNET) is also recognized. V.V. and H.M. acknowledge the financial aid by the Consolider-CPAN CSD-2007-00042 project. The electronics for the test bench and the reference detectors were provided by the Fast Timing Pool of Electronics and MASTICON.

Uncontrolled Keywords:Picosecond lifetime measurements; Neutron-rich nuclei; Energy resolution; Scintillators; LaBr3-Ce; XP20D0
Subjects:Sciences > Physics > Nuclear physics
ID Code:32963
Deposited On:02 Sep 2015 16:41
Last Modified:10 Dec 2018 14:57

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