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Scintillators material R&D



Fig.1 PSD plot for the CLYC clyc crystal

Fig.2. PSD of the LaBr3 :Ce-based phoswich scintillator. The CLYC and the LaBr3 :Ce contribution are well separated

Since few years the R&D Detector group is carrying on a research activity on new scintillator materials for application in nuclear physics experiments.

In particular we lately focused our attention on the study of the detection properties of an elpasolite-based phoswich scintillator detector.

Elpasolite scintillators provide the ability to detect neutrons in a gamma ray filled environment via the Li6 neutron capture. The CLYC crystal, in particular, is characterized by a light yield of 20 ph/keV, has a fast decay component of 50ns and a long one of 1us, and a wavelength of emission peaked at 370nm.

In our R&D activity we focused our attention on the investigation of the feasibility of a compact, solid-state detector for n/gamma detection discrimination based on the use of the phoswich technology. With this approach, even small volumes of elpasolite crystals can be used in a cost-effective way as they are combined to cheaper and/or complementary materials. The ultimate goal would be to associate the phoswich with HPGe detectors in compact geometry to detect neutrons, with good efficiency, in coincidence with gamma rays from exotic sources produced at present or next generation radioactive ion-beam facilities.

For this study we evaluated the effect of coupling one CLYC crystal, equipped with two entrance window, to another scintillator (LaBr3:Ce, CeBr3, SrI2:Eu, BGO) and we investigated if, in this configuration, it was still possible to exploit the appealing properties of both materials, as n detection, high light yield and high stopping power. To this aim we measured the light yield and the energy resolution and we performed digital signal processing for the different formed phoswiches.


Contact  : G. Hull

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Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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