Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 19: Detector systems I

T 19.4: Vortrag

Montag, 15. März 2021, 16:50–17:05, Ts

A 2D pixelated stilbene scintillator detector array for simultaneous radiography with fast neutrons and gammas — Ilya Aleshin, •Nina Höflich, and Oliver Pooth — III. Physikalisches Institut B, RWTH Aachen University, D-52056 Aachen

The Neutron Detectors group at the Physics Institute III B develops pixelated detectors for fast neutron imaging applications with compact neutron sources such as Americium-Beryllium sources or neutron generators. The detectors use specialized scintillators such as stilbene that enable to distinguish neutron and gamma induced signals via pulse shape discrimination. Therefore, these detectors allow for a simultaneous investigation of objects with neutrons and gammas.
In this talk, recently published results (arXiv: 2010:01870) obtained with our 16-pixel detector prototype will be presented. This prototype consists of 16 stilbene cuboids of size 5×5×25 mm³ coupled to a 4×4 SiPM array. The prototype was tested with a D-D neutron generator at the Paul Scherrer Institute in Switzerland, that emits neutrons between 2.3 and 2.8 MeV energy. Attenuating samples with different composition and thickness were placed between the generator and the 16-pixel detector. The neutron attenuation in dependence of material and thickness was studied and fast neutron macroscopic cross sections were calculated and compared to the expected ones. Geant4 simulations were used to study deviations. The detection efficiency for D-D neutrons was measured to be around 10%.