Efficient 2S3 positronium production by stimulated decay from the 3P3 level
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review A"
DOI: 10.1103/physreva.100.063414
Abstract: We investigate experimentally the possibility of enhancing the production of $2^3S$ positronium atoms by driving the $1^3S$-$3^3P$ and $3^3P$-$2^3S$ transitions, overcoming the natural branching ratio limitation of spontaneous decay from $3^3P$ to $2^3S$. The decay… read more here.
Keywords: production stimulated; positronium production; efficient 2s3; production ... See more keywords
Rydberg-positronium velocity and self-ionization studies in a 1T magnetic field and cryogenic environment
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review A"
DOI: 10.1103/physreva.102.013101
Abstract: We characterized the pulsed Rydberg-positronium production inside the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold antiprotons and slow Rydberg-positronium atoms. Velocity… read more here.
Keywords: magnetic field; velocity; rydberg positronium; positronium ... See more keywords
Properties of the anomalous states of positronium
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DOI: 10.1103/physreva.107.042816
Abstract: It is shown that there are anomalous bound-state solutions to the two-body Dirac equation for an electron and positron interacting via an electromagnetic potential. These anomalous solutions have quantized coordinates at nuclear distances (fermi) and… read more here.
Keywords: properties anomalous; positronium; states positronium; anomalous states ... See more keywords
Velocity-selected production of 2S3 metastable positronium
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DOI: 10.1103/physreva.99.033405
Abstract: Positronium in the $2^3S$ metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns) making it a promising candidate for interferometry experiments with a neutral matter-antimatter system. In the present work, $2^3S$… read more here.
Keywords: velocity; selected production; production 2s3; velocity selected ... See more keywords
Positronium Lifetime Image Reconstruction for TOF PET
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Transactions on Medical Imaging"
DOI: 10.1109/tmi.2022.3174561
Abstract: Positron emission tomography is widely used in clinical and preclinical applications. Positronium lifetime carries information about the tissue microenvironment where positrons are emitted, but such information has not been captured because of two technical challenges.… read more here.
Keywords: positronium lifetime; positronium; tof pet;