Results 41 to 50 of about 4,639 (219)

Observation of a shape resonance of the positronium negative ion

Nature Communications, 2016
The Positronium negative ion is formed by two electrons bound to a positron, and experimental investigations of its states and energy levels are difficult due to its short lifetime.
Koji Michishio, Tsuneto Kanai, Susumu Kuma, Toshiyuki Azuma, Ken Wada, Izumi Mochizuki, Toshio Hyodo, Akira Yagishita, Yasuyuki Nagashima   +8 more
doaj   +1 more source

Positronium image of the human brain in vivo. [PDF]

Sci Adv
Positronium is abundantly produced within the molecular voids of a patient’s body during positron emission tomography (PET). Its properties dynamically respond to the submolecular architecture of the tissue and the partial pressure of oxygen. Current PET
Moskal P, Baran J, Bass S, Choiński J, Chug N, Curceanu C, Czerwiński E, Dadgar M, Das M, Dulski K, Eliyan KV, Fronczewska K, Gajos A, Kacprzak K, Kajetanowicz M, Kaplanoglu T, Kapłon Ł, Klimaszewski K, Kobylecka M, Korcyl G, Kozik T, Krzemień W, Kubat K, Kumar D, Kunikowska J, Mączewska J, Migdał W, Moskal G, Mryka W, Niedźwiecki S, Parzych S, Del Rio EP, Raczyński L, Sharma S, Shivani S, Shopa RY, Silarski M, Skurzok M, Tayefi F, Ardebili KT, Tanty P, Wiślicki W, Królicki L, Stępień EŁ.   +43 more
europepmc   +2 more sources

Anomalous states of positronium

, 2019
The energies and wave functions of the two-body Dirac equation for positronium are compared with those of the Pauli approximation and the Bethe-Salpeter equation.
Patterson, Chris W
core   +1 more source

positronium [PDF]

, 2014
Citation: 'positronium' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.P04770 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

Generalized Beth–Uhlenbeck Entropy Formula From the Φ‐Derivable Approach

Contributions to Plasma Physics, EarlyView.
ABSTRACT We derive a generalized Beth–Uhlenbeck formula for the entropy of a dense fermion system with strong two‐particle correlations, including scattering states and bound states. We work within the Φ‐derivable approach to the thermodynamic potential.
David Blaschke, Gerd Röpke, Gordon Baym
wiley   +1 more source

Formation of protonium and positronium in atomic collisions [PDF]

, 2001
A minimum-norm method has been developed for solving the coupled integro-differential equations describing the scattering of positrons by one-electron targets in which the rearrangement channels for positronium formation have been explicitly included ...
Whitehead, Richard John, Whitehead, R.J.
core  

Effect of Positronium on the γ-Ray Spectra and Energy Deposition in Type Ia Supernovae

The Astrophysical Journal
Type Ia supernovae (SNe Ia) are powered by the radioactive decay of isotopes such as ^56 Ni and ^56 Co, making their γ -ray spectra useful probes of the explosion mechanism and ejecta structure.
Anirban Dutta, Andrew G. Fullard, Wolfgang E. Kerzendorf, J. T. O’Brien, Cecelia Powers, Stuart A. Sim, Andreas Flörs, Or Graur   +7 more
doaj   +1 more source

Shallow Trap States Induced by Zinc Vacancies in Wurtzite ZnO for Enhanced Charge Separation and Photocatalytic Hydrogen and Oxygen Evolution Reactions

Advanced Energy and Sustainability Research, Volume 7, Issue 4, April 2026.
Zinc vacancies in ZnO act as intrinsic acceptor‐type defects that create shallow trap states proximal to the valence band maximum. These defect‐induced states promote efficient separation and migration of photogenerated electron–hole pairs by suppressing rapid bulk recombination.
Srinath Ranjan Tripathy, Saroj Sundar Baral   +1 more
wiley   +1 more source

Positronium Annihilation Lifetime Spectroscopy Study of SBA-15 [PDF]

, 2010
Positronium annihilation lifetime spectroscopy (PALS) is a technique used in the characterization of porosity in nanostructured materials. Positrons, the antiparticle to the electron, enter a sample and either immediately annihilate with an electron or ...
Tracy K. Steinbach, Steinbach, Tracy K
core  

Near-threshold production of antihydrogen positive ion in positronium–antihydrogen collision

New Journal of Physics, 2021
Near-threshold production of antihydrogen ion ( ${\bar{\mathrm{H}}}^{+}$ ) in positronium–antihydrogen collisions is predicted by a rigorous four-body scattering calculation.
Takuma Yamashita, Yasushi Kino, Emiko Hiyama, Svante Jonsell, Piotr Froelich   +4 more
doaj   +1 more source