Results 51 to 60 of about 245,057 (208)

Single-shot positron annihilation lifetime spectroscopy using a liquid scintillator

AIP Advances, 2021
Liquid scintillators provide a fast, single component response. However, they traditionally have a low flashpoint and high vapor pressure. We demonstrate the use of an EJ-309 scintillator (high flashpoint and low vapor pressure variant) to acquire single-
Joshua R. Machacek, Shawn McTaggart, Larry W. Burggraf   +2 more
doaj   +1 more source

Reverse transformation of deformation-induced martensite in austenitic stainless steel studied by positron annihilation

Journal of Materials Science, 2014
The reversion of deformation-induced α′-martensite in tension-deformed 1.4301 (EN) stainless steel was investigated using positron annihilation spectroscopy.
E. Dryzek, M. Sarnek, M. Wróbel
semanticscholar   +1 more source

Comparison of the Coating Structure of Silicon‐Based PECVD Coatings With Varying Organic Content

Plasma Processes and Polymers, EarlyView.
Silicon‐based PECVD coatings transition abruptly from organic SiOCH to oxidic SiOx at ~32 at% silicon, exhibiting threshold behavior in barrier performance. Chemical composition seems to dominate over porosity: SiOx coatings unexpectedly show higher porosity yet superior barrier properties, possibly due to rigid cage‐like molecular structures ...
Jonas Franke, Maciej Oskar Liedke, Andreas Schäfer, Maik Butterling, Ahmed Gamal Attallah, Eric Hirschmann, Andreas Wagner, Rainer Dahlmann   +7 more
wiley   +1 more source

Effects of Electroweak Radiative Corrections in Polarized Low-Energy Electron–Positron Annihilation into Lepton Pairs [PDF]

, 2022
A. B. Arbuzov, S. Bondarenko, Ya. Dydyshka, L. Kalinovskaya, L. Rumyantsev, R. Sadykov, V. Yermolchyk, Yu. Yermolchyk   +7 more
openalex   +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

Positron Spectroscopy of Nanodiamonds after Hydrogen Sorption

Nanomaterials, 2018
The structure and defects of nanodiamonds influence the hydrogen sorption capacity. Positronium can be used as a sensor for detecting places with the most efficient capture of hydrogen atoms.
Lyudmila Nikitina, Roman Laptev, Yuri Abzaev, Andrey Lider, Alexander Ivashutenko   +4 more
doaj   +1 more source

Hadron pair production in semi-inclusive electron positron annihilation process at twist-4

European Physical Journal C: Particles and Fields, 2022
Fragmentation functions are important quantities in describing the hadronization process in high energy reactions. They can induce various azimuthal modulations which can be measured to reveal correlations between transverse momenta and polarizations ...
Weihua Yang
doaj   +1 more source

Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth [PDF]

Science, 2017
Exotic origin for cosmic positrons Several cosmic-ray detectors have found more positrons arriving at Earth than expected. Some researchers interpret this as a signature of exotic physics, such as the annihilation of dark matter particles.
A. Abeysekara, A. Albert, R. Alfaro, C. Alvarez, J. Álvarez, R. Arceo, J. C. Arteaga-Velázquez, D. Avila Rojas, H. Ayala Solares, A. Barber, N. Bautista-Elivar, A. Becerril, E. Belmont-Moreno, S. Benzvi, D. Berley, A. Bernal, J. Braun, C. Brisbois, K. Caballero-Mora, T. Capistrán, A. Carramiñana, S. Casanova, M. Castillo, U. Cotti, J. Cotzomi, S. Coutiño de León, C. de León, E. de la Fuente, B. Dingus, M. DuVernois, J. C. Díaz-Vélez, R. Ellsworth, K. Engel, O. Enŕıquez-Rivera, D. Fiorino, N. Fraija, J. García-González, F. Garfias, M. Gerhardt, A. Gonzalez Muñoz, M. González, J. Goodman, Z. Hampel-Arias, J. P. Harding, S. Hernández, A. Hernández-Almada, J. Hinton, B. Hona, C. Hui, P. Hüntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, S. Kaufmann, D. Kieda, A. Lara, R. Lauer, W. Lee, D. Lennarz, H. L. Vargas, J. Linnemann, A. Longinotti, G. Luis Raya, R. Luna-García, R. López-Coto, K. Malone, S. Marinelli, O. Martinez, I. Martinez-Castellanos, J. Martínez-Castro, H. Martínez-Huerta, J. Matthews, P. Miranda-Romagnoli, E. Moreno, M. Mostafá, L. Nellen, M. Newbold, M. Nisa, R. Noriega-Papaqui, R. Pelayo, J. Pretz, E. Pérez-Pérez, Z. Ren, C. Rho, C. Rivière, D. Rosa-González, M. Rosenberg, E. Ruiz-Velasco, H. Salazar, F. Salesa Greus, A. Sandoval, M. Schneider, H. Schoorlemmer, G. Sinnis, A. Smith, R. Springer, P. Surajbali, I. Taboada, O. Tibolla, K. Tollefson, I. Torres, T. Ukwatta, G. Vianello, T. Weisgarber, S. Westerhoff, I. Wisher, J. Wood, T. Yapici, G. Yodh, P. Younk, A. Zepeda, H. Zhou, F. Guo, J. Hahn, H. Li, H. Zhang   +115 more
semanticscholar   +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

Positron Annihilation Spectroscopy in Materials and Technical Details of Measurement Systems [PDF]

فصلنامه علوم و فناوری فضایی, 2013
Being a very powerful method, Positron Annihilation Spectroscopy (PAS) has been widely used for investigation of defects type and concentration in materials in recent years.
A. A. Mehmandoost-Khajeh-Dad, M. Khaghani, M. Jafarzadeh-Khatibani   +2 more
doaj