2020/06/30 by K. Dulski, Steven D. Bass, S. D. Bass +50
Medicine · Physics and Astronomy · #Annihilation #Atomic and Subatomic Physics Research #Atomic physics #Detector #Electron #Medical Imaging Techniques and Applications #Nuclear physics #Optics #Photon #Physics #Positron #Positronium #Radiation Detection and Scintillator Technologies #Scintillation #Scintillator #nucl-ex #physics.ins-det
paper · pdf · doi:10.1016/j.nima.2021.165452
12 pages, 7 figures
openalex publication_date 2021/05/24 · arxiv created 2021/05/25 · arxiv updated 2021/05/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The J-PET tomograph is constructed from plastic scintillator strips arranged axially in concentric cylindrical layers. It enables investigations of positronium decays by measurement of the time, position, polarization and energy deposited by photons in the scintillators, in contrast to studies conducted so far with crystal and semiconductor based detection systems where the key selection of events is based on the measurement of the photons energies. In this article we show that the J-PET tomograph system is capable of exclusive measurements of the decays of ortho-positronium atoms. We present the first positronium production results, its lifetime distribution measurements and discuss estimation of the influence of various background sources. The tomograph s performance demonstrated here makes it suitable for precision studies of positronium decays including entanglement of the final state photons, positron annihilation lifetime spectroscopy plus molecular imaging diagnostics.