Results 61 to 70 of about 4,848 (208)

Review of physics program at J-PET [PDF]

EPJ Web of Conferences
The Jagiellonian - Positron Emission Tomograph (J-PET) is a multi purpose detector for tests of discrete symmetries and quantum entanglement of photons originating from the decay of positronium atoms.
Czerwiński Eryk
doaj   +1 more source

Characterization of imperfections in scintillator crystals using gamma-ray induced positron annihilation lifetime spectroscopy

Optical Materials: X, 2022
Gamma-ray-induced positron annihilation lifetime spectroscopy (GiPALS) was used to characterize pristine and codoped Lu3Al5O12 (LuAG) crystals grown using Czochralski (Cz) and micropulling-down (mPD) methods.
Mamoru Kitaura, Yoshitaka Taira, Shinta Watanabe   +2 more
doaj   +1 more source

Vacancy‐Type Defects in n‐Type GaN Fabricated by Low‐Dose Ion Implantation Studied by a Monoenergetic Positron Beam

physica status solidi (b), EarlyView.
Vacancies in low‐dose ion‐implanted GaN are studied by positron annihilation. Depth profiles of the net donor concentration (ND) are close to those for implanted impurities, but ND is 2–3 times higher than concentrations of implanted ions. The origin of donor‐like defects is expected to be N‐vacancy‐related defects, and Ga‐vacancy‐type defects play a ...
Akira Uedono, Hiroko Iguchi, Masahiro Horita, Jun Suda, Kohei Shima, Shigefusa F. Chichibu, Shoji Ishibashi   +6 more
wiley   +1 more source

Structural and Transport Properties of Thick and Thin Cr2AlC Films

physica status solidi (RRL) – Rapid Research Letters, EarlyView.
This study compares structural and transport properties of Cr2AlC thin films (50 and 500 nm) systematically disordered by ion irradiation. Columnar grain growth is observed only in 500 nm films, while both films exhibit a weak fiber texture. Kondo scattering from displaced Cr atoms leads to a resistivity upturn, with distinct magnetoresistance in each ...
João Salgado Cabaço, Fabian Ganss, Javier Pablo‐Navarro, César Magén, Manuel Ricardo Ibarra, Marcin Perzanowski, Ulrich Kentsch, Jürgen Lindner, Jürgen Faßbender, Christoph Leyens, Richard Boucher, Rantej Bali   +11 more
wiley   +1 more source

Event shapes and jet rates in electron-positron annihilation at NNLO [PDF]

, 2009
This article gives the perturbative NNLO results for the most commonly used event shape variables associated to three-jet events in electron-positron annihilation: Thrust, heavy jet mass, wide jet broadening, total jet broadening, C parameter and the ...
S. Weinzierl
semanticscholar   +1 more source

Low-energy supernova constraints on millicharged particles

Journal of High Energy Physics
The hot and dense conditions of the supernova core provide an ideal environment for the production of new feebly-interacting particles. Low-energy supernovae, characterized by low explosion energy, are particularly intriguing due to their stringent ...
Changqian Li, Zuowei Liu, Wenxi Lu, Zicheng Ye   +3 more
doaj   +1 more source

Emerging applications of rare‐earth fluoride nanocrystals in medicine and biotechnologies

Responsive Materials, EarlyView.
Rare‐earth fluoride nanocrystals (REFNCs) exhibit high responsivity and can be used as multi‐modal agents in medicine and theranostics. This review summarizes recent advances in REFNCs, covering their synthesis, structures, luminescent properties, and applications in multi‐modal imaging and photodynamic therapy, highlighting their theranostic potential
Alain Tressaud, Zhichao Wang, Yuqi Tang, Quan Li   +3 more
wiley   +1 more source

Collimation, compression and acceleration of isotropic hot positrons by an intense vortex laser

New Journal of Physics, 2023
Laser-driven positron sources, characterized by short pulse width, small focal spot and high energy, are promising for potential applications, e.g. electron–positron collider and positron annihilation spectroscopy. However, the broad divergence angle and
Y Cao, L X Hu, D B Zou, X H Yang, Y T Hu, J Zhao, Y Lu, Y Yin, F Q Shao, T P Yu   +9 more
doaj   +1 more source

Hydrogen response to high‐density dislocations in bulk perovskite oxide SrTiO3

Journal of the American Ceramic Society, Volume 109, Issue 1, January 2026.
High‐density dislocations are engineered into single‐crystal strontium titanate using cyclic Brinell indentation scratch tests at room temperature. These dislocations are found effective in uptaking hydrogen. Abstract Hydrogen plays an increasingly important role in green energy technologies. For instance, proton‐conducting oxides with high performance
Xufei Fang, Lars Dörrer, Svetlana Korneychuk, Maria Vrellou, Alexander Welle, Stefan Wagner, Astrid Pundt, Harald Schmidt, Christoph Kirchlechner   +8 more
wiley   +1 more source

ON THE MORPHOLOGY OF THE ELECTRON–POSITRON ANNIHILATION EMISSION AS SEEN BY SPI/INTEGRAL [PDF]

, 2010
The 511 keV positron annihilation emission remains a mysterious component of the high energy emission of our Galaxy. Its study was one of the key scientific objectives of the SPI spectrometer on board the International Gamma-Ray Astrophysics Laboratory ...
L. Bouchet, J. Roques, E. Jourdain
semanticscholar   +1 more source