Influence of Cosmic Radiation while Testing the Time Reversal Symmetry in the Decay of Ortho-Positronium Atoms using the J-PET detector

J Raj,E Czerwiński

doi:10.1088/1742-6596/1586/1/012010

J Raj, E Czerwiński

https://doi.org/10.1088/1742-6596/1586/1/012010

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This article reports the influence of cosmic radiation interaction while testing the T-symmetry in metastable triplet states of positronium with the Jagiellonian-Positron Emission Tomograph (J-PET) detector. The J-PET detector developed at Jagiellonian University in Krakow, Poland is one of its kind being based on organic scintillators. J-PET is an axially symmetric and high acceptance scanner that can be used as a multi-purpose detector system. It is well suited to pursue tests of discrete symmetries in decays of positronium in addition to medical imaging. Cosmic rays have been considered as a well known source of background while performing test measurements with the J-PET detector. It is important to estimate and reject the significant contribution of the cosmic ray interactions within the J-PET detector in order to improve the sensitivity while testing T-symmetry violation. Therefore, the results of cosmic radiation uniquely being separated due to their large energy deposits in plastic scintillator detectors are shown in this article.

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Cosmic rays were discovered by an Austrian physicist Victor Hess in the early 1900’s when he found that a charged electroscope discharged rapidly as it ascended in a balloon [1]
The results presented in this article were produced using the Jagiellonian-Positron Emission Tomograph (J-Positron emission tomography (PET)) analysis framework to collect data and perform off-line analysis [10, 16]
Discrete symmetries were proposed to be tested with the ortho-positronium (o-Ps) system by determining the non-zero expectation value of the operator constructed the polarization ( i) direction and momentum direction (k2) of the annihilation photons originating from the decay of o-Ps atoms, as listed in Table 1 [7]

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Introduction

Cosmic rays were discovered by an Austrian physicist Victor Hess in the early 1900’s when he found that a charged electroscope discharged rapidly as it ascended in a balloon [1]. 3. Producing meta-stable ortho-Positronium to test T-symmetry recorded by the J-PET detector Time reversal symmetry violation has not been observed in purely leptonic systems, so far [21].

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