Results 21 to 30 of about 558,215 (330)
Frontiers in Physics, 2021 Background: Increased throughput in small animal preclinical studies using positron emission tomography leads to reduced costs and improved efficiency of experimental design, however the presence of multiple off-centre subjects, as opposed to a single ...
Nikos Efthimiou +10 more
doaj +1 more source
Identifying vacancy complexes in compound semiconductors with positron annihilation spectroscopy: a case study of InN [PDF]
, 2011 We present a comprehensive study of vacancy and vacancy-impurity complexes in InN combining positron annihilation spectroscopy and ab-initio calculations.
Christian Rauch +4 more
core +2 more sources
Towards an Improved Test of the Standard Model’s Most Precise Prediction
Atoms, 2019 The electron and positron magnetic moments are the most precise prediction of the standard model of particle physics. The most accurate measurement of a property of an elementary particle has been made to test this result.
G. Gabrielse +3 more
doaj +1 more source
Galactic secondary positron flux at the Earth [PDF]
, 2009 Secondary positrons are produced by spallation of cosmic rays within the interstellar gas. Measurements have been typically expressed in terms of the positron fraction, which exhibits an increase above 10 GeV. Many scenarios have been proposed to explain
Aguilar +51 more
core +5 more sources
Atoms, 2021 A detailed study of positron impact elastic scattering from methane and silane is carried out using a model potential consisting of static and polarization potentials.
Dibyendu Mahato +2 more
doaj +1 more source
18F-fluorodeoxyglucose positron emission tomography / computed tomography in primary Ewing sarcoma of the lung [PDF]
Srpski Arhiv za Celokupno Lekarstvo, 2022 Introduction. Ewing sarcoma is rare in medical practice, and evaluating positron emission tomography / computed tomography (PET/CT) imaging of soft tissue Ewing sarcoma is a challenge. Primary Ewing sarcoma of the lung is an infrequent diagnosis.
Zivgarević Ljiljana, Žunić Svetlana
doaj +1 more source
Relativistic Ionization of Hydrogen Atoms by Positron Impact
Atoms, 2016 Relativistic triple differential cross-sections (TDCS) for ionization of hydrogen atoms by positron impact have been calculated in the symmetric coplanar geometry. We have used Dirac wave functions to describe free electron’s and positron’s sates.
Amal Chahboune +3 more
doaj +1 more source
Universe, 2020 We investigated the effects that occur during the circulation of ultrarelativistic electrons and positrons in the field of an X-ray pulsar. A resonant process in annihilation and the subsequent production of the electron–positron pairs were studied ...
Dmitriy V. Doroshenko +2 more
doaj +1 more source
Frontiers in Physics, 2019 The fast-paced development of laser-wakefield electron acceleration has recently culminated in the generation of electron beams with extreme characteristics, including femtosecond-scale duration, mrad divergence, and high-energy.
Aaron Alejo +3 more
doaj +1 more source
Relativistic coupled-cluster single-double calculations of positron-atom bound states [PDF]
, 2012 Relativistic coupled-cluster single-double approximation is used to calculate positron-atom bound states. The method is tested on closed-shell atoms such as Be, Mg, Ca, Zn, Cd, and Hg where a number of accurate calculations is available.
C. Harabati +8 more
core +2 more sources