Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 40: Detectors 5 (scintillators)

T 40.7: Vortrag

Dienstag, 5. März 2024, 17:30–17:45, Geb. 30.23: 2/17

Stilbene scintillation anisotropy for neutron source localisation — •Glen Kiely, Nina Höflich, and Oliver Pooth — III. Physikalisches Institut B, RWTH Aachen University, 52074 Aachen

Stilbene is a widely used scintillator material which is best known for its pulse shape discrimination capability, allowing for the distinction between neutron and gamma-ray interactions. This ability is utilised in neutron and gamma ray tomography at the neutron detectors research group at RWTH Aachen. Stilbene has also recently been applied in the field of nuclear non-proliferation for the detection of special nuclear materials.

The scintillation properties of stilbene crystals were investigated, with a particular focus on anisotropy of the scintillation light output. The anisotropy has been characterised by previous studies, and the crystal axes of maximum and minimum response have been identified. The scintillation anisotropy was implemented into Geant4 for the first time through a modification of the G4Scintillation class. A Geant4 model of a detector capable of neutron source localisation was then simulated, which leverages the inherent scintillation anisotropy through rotation of the detector, to determine the location of a neutron source relative to the crystal axes.

Keywords: Neutron detection; Geant4; Scintillation detectors