Characterization of Large Volume 3.5″ x 8″ LaBr3:Ce Detectors for the HECTOR+ array
1 Dipartimento di Fisica, Università di Milano and INFN sezione di Milano, via Celoria 16, 20133 Milano, Italy
2 INFN sezione di. Milano, via Celoria 16, 20133 Milano, Italy
3 Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), P.O. Box 51, H-4001, Debrecen, Hungary
1 e-mail: email@example.com
Published online: 20 March 2014
A selection of the properties of large volume, cylindrical 3.5” x 8” LaBr3:Ce scintillation detectors coupled to a 3.5” PMT (model R10233-1000SEL from HAMAMATSU) and a special designed Voltage Divider (LABRVD) will be discussed. A number of 10 of such detectors constitute the HECTOR+ array which, in fall 2012, measured at GSI coupled to the AGATA DEMOSTRATOR at the PRESPEC experimental setup. These crystals are among the largest ever produced and needed to be characterized. We have performed several tests and here we discuss, in particular, the energy resolution measured using monochromatic γ−ray sources and in-beam reactions producing γ−rays up to 22.6 MeV. As already measured in two previous works a saturation in the energy resolution was observed in case of high energy gamma rays. Crystal non-homogeneities and PMT gain drifts can affect the resolution of measurements especially in case of high energy γ−rays.
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