Position Reconstruction in a Dual Phase Xenon Scintillation Detector

Details Position Reconstruction in a Dual Phase Xenon Scintillation Detector Position Reconstruction in a Dual Phase Xenon Scintillation Detector

2011-12-07

arxiv.org/abs/1112.1481v1

Physics

Instrumentation and Detectors

8 pages, 7 figures, in the Conference Record of IEEE NSS 2011, Submitted to IEEE Trans. on Nuc. Sci

Scientific paper

We studied the application of statistical reconstruction algorithms, namely maximum likelihood and least squares methods, to the problem of event reconstruction in a dual phase liquid xenon detector. An iterative method was developed for in-situ reconstruction of the PMT light response functions from calibration data taken with an uncollimated gamma-ray source. Using the techniques described, the performance of the ZEPLIN-III dark matter detector was studied for 122 keV gamma-rays. For the inner part of the detector (R<100 mm), spatial resolutions of 13 mm and 1.6 mm FWHM were measured in the horizontal plane for primary and secondary scintillation, respectively. An energy resolution of 8.1% FWHM was achieved at that energy. The possibility of using this technique for improving performance and reducing cost of scintillation cameras for medical applications is currently under study.

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