Trilateration-based reconstruction of ortho-positronium decays into three photons with the J-PET detector

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• 作者：A. Gajos^a ; D. Kamińska^a ; E. Czerwiński^a ; ^{eryk.czerwinski@uj.edu.pl" class="auth_mail" title="E-mail the corresponding author} ; D. Alfs^a ; T. Bednarski^a ; P. Białas^a ; B. Głowacz^a ; M. Gorgol^b ; B. Jasińska^b ; Ł. Kapłon^a ; ^c ; G. Korcyl^a ; P. Kowalski^d ; T. Kozik^a ; W. Krzemień^e ; E. Kubicz^a ; M. Mohammed^a ; Sz. Niedźwiecki^a ; M. Pałka^a ; M. Pawlik-Niedźwiecka^a ; L. Raczyński^d ; Z. Rudy^a ; O. Rundel^a ; N.G. Sharma^a ; M. Silarski^a ; A. Słomski^a ; A. Strzelecki^a ; A. Wieczorek^a ; ^c ; W. Wiślicki^d ; B. Zgardzińska^b ; M. Zieliński^a ; P. Moskal^a
• 关键词：Reconstruction ; Positronium ; Discrete symmetry ; J-PET
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：21 May 2016
• 年：2016
• 卷：819
• 期：Complete
• 页码：54-59
• 全文大小：476 K

文摘

This work reports on a new reconstruction algorithm allowing us to reconstruct the decays of ortho-positronium atoms into three photons using the places and times of photons recorded in the detector. The method is based on trilateration and allows for a simultaneous reconstruction of both location and time of the decay. Results of resolution tests of the new reconstruction in the J-PET detector based on Monte Carlo simulations are presented, which yield a spatial resolution at the level of 2 cm (FWHM) for X and Y and at the level of 1 cm (FWHM) for Z available with the present resolution of J-PET after application of a kinematic fit. Prospects of employment of this method for studying angular correlations of photons in decays of polarized ortho-positronia for the needs of tests of CP and CPT discrete symmetries are also discussed. The new reconstruction method allows for discrimination of background from random three-photon coincidences as well as for application of a novel method for determination of the linear polarization of ortho-positronium atoms, which is also introduced in this work.