Through the last decades positron and positronium annihilation have been powerful tools for fundamental studies in physics, chemistry, and matter. Now the recent development of novel type of positron emission tomography (PET) at the Jagiellonian University in Krakow stimulates great interest to understand positron/positronium interactions with gases dissolved in liquids and urges new research...
Author:
Sebastiano Mariazzi
Co-authors:
Ruggero Caravita, Lisa Glöggler, Luca Povolo, Luca Penasa, Sushil Sharma, Pawel Moskal, Roberto Sennen Brusa
Recent experiments have demonstrated the possibility to produce positronium in the long-lived 23S state (lifetime of 1142 ns) via 13S→33P [1] laser excitation followed by spontaneous [2, 3] or stimulated [4] 33P→23S transition. This excitation...
The Positronium system, a bound state of an electron and a positron, is suitable for testing the predictions of quantum electrodynamics (QED), since its properties can be perturbatively calculated to high accuracy and, unlike the hydrogen system, is not affected by finite size or QCD effects at the current experimental precision level. Experiments searching for invisible decays of the Ps...
The Jagiellonian PET (J-PET) detector is the only device which enables estimation of positronium spin axis together with determination of polarization of photons from positronium annihilation on the event-by-event basis. This allows to test angular correlations in the annihilations of the lightest leptonic bound system and explore a new class of discrete symmetry odd operators that were not...
