4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
The Proceedings of SAIP2016 published on 24 December 2017
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Understanding proton induced radiation damage in plastic scintillators using electron paramagnetic resonance and DFT modelling

Presented by Mr. Chad PELWAN on 5 Jul 2016 from 14:20 to 14:40
Type: Oral Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials

Abstract

Plastic scintillators form and integral part of particle detectors, such as the ATLAS detector at the LHC, as they are able to measure energies and track momenta of particles after a collision. Electron paramagnetic resonance (EPR) has been employed to study unpaired electrons and ions that are present in pristine and damaged plastic scintillator samples. Six different types of plastics were investigated, based on either polystyrene or polyvinyl toluene (PVT) . Samples were subjected to irradiation doses between 0.8 – 80.0 MGy using 6 MeV protons. EPR studies conducted on these samples showed a decrease in g-factor of each sample with an increase dose. It is suggested that an increase in dose introduces secondary electrons and ions into the system increasing the spin density and the relaxation time. Computational DFT modeling of polystyrene and PVT monomers and dimers show that damaging the molecules decreases components of the g-tensor and alters the components of the hyperfine tensor related to the g-factor and relaxation time, respectfully.

Award

Yes

Level

MSc

Supervisor

Prof. Bruce Mellado, Bruce.Mellado@Wits.ac.za, The University of the Witwatersrand

Paper

Yes

Permission

Yes

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room: 4B


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