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Abstract
A selection of the properties of large volume, cylindrical 3.5” x 8” LaBr 3 :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.
Highlights
The scintillation properties of LaBr3:Ce crystal were discovered in 2001 [1] and the crystal is commercialized by St
As already measured in two previous works a saturation in the energy resolution was observed in case of high energy gamma rays
A large amount of works with small sized LaBr3:Ce detectors can be found in the literature, but only very few works related to medium volume detectors are available and even less information is available for large volume LaBr3:Ce detectors
Summary
The scintillation properties of LaBr3:Ce crystal were discovered in 2001 [1] and the crystal is commercialized by St. 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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