International workshop "Positronium - from Quantum Physics to Medical Applications"

Investigation of decoherence of annihilation quanta

26 Apr 2023, 15:00

30m

Split, Croatia

Positronium in fundamental research Positronium in fundamental investigations

Speaker

Dr Siddharth Parashari (Department of Physics, Faculty of Science, University of Zagreb)

Description

Recently, different groups have performed measurement of polarization correlations of annihilation quanta after inducing decoherence of one of the gammas by Compton scattering yielding somewhat contradictory results. Watts et al. [Nat. Commun., 12, 2646, (2021)] reported the result hinting at loss of correlation, while Abdurashitov et. al. [Jour. Inst. 17, P03010, (2022)] reported strong correlation at least at small scattering angles. We have used the setup based on Single Layer Gamma Ray Polarimeters to measure the correlation of annihilation quanta after an intermediate Compton scattering under angles ranging from 0 to 50 degree, thus significantly extending the range compared to previous measurements. The results of these investigations will be presented.

Presentation materials

Investigation of Decoherence of Annihilation Quanta.pptx