Results 21 to 30 of about 245,057 (208)
Dark sector studies with the PADME experiment
SciPost Physics Proceedings, 2023 The Positron Annihilation to Dark Matter Experiment (PADME) uses the positron beam of the DA$\Phi$NE Beam-Test Facility, at the Laboratori Nazionali di Frascati (LNF) to search for a Dark Photon $A'$.
Anna Paola Caricato, Maurizio Martino, Isabella Oceano, Federica Oliva, Stefania Spagnolo, Gabriele Chiodini, Fabio Bossi, Riccardo De Sangro, Claudio Di Giulio, Danilo Domenici, Giuseppe Finocchiaro, Luca Gennaro Foggetta, Marco Garattini, Andrea Ghigo, Federica Giacchino, Paola Gianotti, Tommaso Spadaro, Eleuterio Spiriti, Clara Taruggi, Elisabetta Vilucchi, Venelin Kozhuharov, Simeon Ivanov, Sevtoslav Ivanov, Radoslav Simeonov, Georgi Georgiev, Fabio Ferrarotto, Emanuele Leonardi, Paolo Valente, Elizabeth Long, Giovanni Organtini, Gabriele Piperno, Mauro Raggi, Salvatore Fiore, Paolo Branchini, Diego Tagnani, Vittoria Capirossi, Federico Pinna, Andre Frankenthal
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Calculations of positron binding and annihilation in polyatomic molecules. [PDF]
Journal of Chemical Physics, 2018 A model-potential approach to calculating positron-molecule binding energies and annihilation rates is developed. Unlike existing ab initio calculations, which have mostly been applied to strongly polar molecules, the present methodology can be applied ...
A. Swann, G. Gribakin
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Tellurium coincidence Doppler broadening spectroscopy study
Results in Physics, 2019 The Coincidence Doppler broadening (CDB) reference curve for pure Tellurium (Te) has been obtained stablishing a point of departure for future Positron Annihilation Spectroscopy (PAS) studies of alloys that include Te among its components to determine ...
R. Domínguez-Reyes
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Testing entanglement of annihilation photons
Scientific Reports, 2023 We present a new experimental study of the quantum entanglement of photon pairs produced in positron-electron annihilation at rest. Each annihilation photon has an energy that is five orders of magnitude higher than the energy of photons in optical ...
Alexander Ivashkin +7 more
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Nuclear Materials and Energy, 2018 Phase separation in Fe–Cr binary alloys irradiated with neutrons at 473 K and 573 K was investigated using positron annihilation spectroscopy. Using positron annihilation coincidence Doppler broadening (CDB) measurements, the phase separation progress ...
Y. Noshita +6 more
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Ultrashort, MeV-scale laser-plasma positron source for positron annihilation lifetime spectroscopy
Physical Review Accelerators and Beams, 2021 Submicron defects represent a well-known fundamental problem in manufacturing since they can significantly affect performance and lifetime of virtually any high-value component. Positron annihilation lifetime spectroscopy is arguably the only established
Thomas L. Audet +12 more
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Gamma-ray spectroscopy of Positron Annihilation in the Milky Way [PDF]
, 2015 The annihilation of positrons in the Galaxy's interstellar medium produces characteristic gamma-rays with a line at 511 keV. This emission has been observed with the spectrometer SPI on INTEGRAL, confirming a puzzling morphology with bright emission from
T. Siegert +7 more
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Calculation of Low-Energy Positron-Atom Scattering with Square-Integrable Wavefunctions
Atoms, 2022 The variational method is applied to the low-energy positron scattering and annihilation problem. The ultimate aim of the investigation is to find a computationally economical way of accounting for strong electron–positron correlations, including the ...
Sarah Gregg, Gleb Gribakin
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Positron annihilation in liquid crystals
Nukleonika, 2015 Positron annihilation studies of liquid crystals are reviewed with particular reference to thermotropic liquid crystals with rod-like molecules. The studies of compounds exhibiting smectic A or smectic E phases indicate that local arrangement of dipole ...
Dryzek Ewa, Juszyńska-Gałązka Ewa
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Neutron irradiated tungsten bulk defect characterization by positron annihilation spectroscopy
Nuclear Materials and Energy, 2021 Positron annihilation spectroscopy was used to evaluate the defects in neutron irradiated tungsten exposed at five different irradiation conditions. The variables in neutron irradiation included temperature, displacements per atom (dpa), and neutron ...
Chase N. Taylor +4 more
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