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Improvement and characterisation of pixelated Cadmium-Zinc-Telluride detectors for use in neutrino-less double-beta decay searches

Spencer, Simeon James Matthew (2011)
Ph.D. thesis, University of Birmingham.

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Abstract

Cadmium-Zinc-Telluride (CZT) detectors are seen as an ideal material for constructing intrinsic detectors for neutrino-less double-beta decay. However, the poor mobility of the charge carriers (specifically the holes) is known to result in poor resolution and decreased photo-efficiency. Simulations of this effect show that the resolution is a function of the detector width/depth ratio, suggesting pixelation as a solution. Pixelation of the detector also allows background sources, and even single-beta events to be selectively vetoed. However, this technique alone cannot completely remove the effect of the reduced resolution.

A technique which combines ‘Gain Matching’ and removal of the low energy tail is outlined and qualified for the resulting improvements in resolution and efficiency. The sharing of events between multiple pixels is also studied and the quality of reconstructed events is established.

The pixelated nature of the detector also opens the door to operation of the detectors as a ‘Compton Camera’. Accordingly, Geant4 simulations are compared with real-world measurements, to establish the benefits of pixelation upon the operation of the detectors as a ‘Compton Camera’.

Finally, comparisons are performed between Geant4 simulations and real-world measurements of intrinsic photopeak efficiency calculations.

Type of Work:Ph.D. thesis.
Supervisor(s):Freer, Martin
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Subjects:QC Physics
Institution:University of Birmingham
ID Code:2985
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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