Position Reconstruction in a Dual Phase Xenon Scintillation Detector

• Main Author: Solovov, V.N. et al. (36 authors)
• Publication Date: 2012
• Other Authors: Chepel, V., DeViveiros, L., Lindote, A., Lopes, M.I., Neves, F., Pinto da Cunha, J., Silva, C.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://dx.doi.org/10.1109/TNS.2012.2221742; http://hdl.handle.net/10400.26/26067

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.