Results 11 to 20 of about 337,692 (304)

Novel designs for undulator based positron sources [PDF]

, 2012
At least three proposed future colliders (ILC, CLiC and LHeC) require a positron source with a yield greater than 1014 e+s−1. An undulator-based positron source has the potential to provide the required yield.
Jenkins, Mike, Bailey, Ian
core   +5 more sources

Eddy current studies from the undulator-based positron source target wheel prototype [PDF]

, 2010
The ef­fi­cien­cy of fu­ture positron sources for the next gen­er­a­tion of high-en­er­gy par­ti­cle col­lid­ers (e.g. ILC, CLIC, LHeC) can be im­proved if the positron-pro­duc­tion tar­get is im­mersed in the mag­net­ic field of ad­ja­cent cap­ture op ...
Piggott, W. T., Jenner, L. J., Gronberg, J., Bailey, I. R., Scott, D. J., Hagler, L. B., Brown, C. G., Zang, L., Clarke, J. A.   +8 more
core   +4 more sources

Influence of Multiple Animal Scanning on Image Quality for the Sedecal SuperArgus2R Preclinical PET Scanner

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, Nikos Efthimiou, John D. Wright, Luke Clayton, Isaline Renard, Federico Zagni, Paulo R.R.V. Caribé, Stephen J. Archibald, Stephen J. Archibald, Christopher J. Cawthorne, Christopher J. Cawthorne   +10 more
doaj   +1 more source

The Theory of Positrons [PDF]

Resonance, 1949
The problem of the behavior of positrons and electrons in given external potentials, neglecting their mutual interaction, is analyzed by replacing the theory of holes by a reinterpretation of the solutions of the Dirac equation. It is possible to write down a complete solution of the problem in terms of boundary conditions on the wave function, and ...
openaire   +3 more sources

Merkuriev Cut-off in e+ − H Multichannel Scattering Calculations

Atoms, 2016
We present the results of positron-Hydrogen multichannel scattering calculations performed on the base of Faddeev-Merkuriev equations. We discuss an optimal choice of the Merkuriev’s Coulomb splitting parameters.
Vitaly A. Gradusov, Vladimir A. Roudnev, Sergey L. Yakovlev   +2 more
doaj   +1 more source

Evaluation of the performance of a high-resolution time-of-flight PET system dedicated to the head and breast according to NEMA NU 2-2012 standard

EJNMMI Physics, 2022
Background This study evaluated the physical performance of a positron emission tomography (PET) system dedicated to the head and breast according to the National Electrical Manufacturers Association (NEMA) NU2-2012 standard.
Daisuke Morimoto-Ishikawa, Kohei Hanaoka, Shota Watanabe, Takahiro Yamada, Yoshiyuki Yamakawa, Suzuka Minagawa, Shiho Takenouchi, Atsushi Ohtani, Tetsuro Mizuta, Hayato Kaida, Kazunari Ishii   +10 more
doaj   +1 more source

What aspects of solar flares can be clarified with mm/submm observations?

Frontiers in Astronomy and Space Sciences, 2022
This paper identifies several unsolved questions about solar flares, which can potentially be answered or at least clarified with mm/submm observations with ALMA.
Gregory D. Fleishman, Juan Carlos Martinez Oliveros, Enrico Landi, Lindsay Glesener   +3 more
doaj   +1 more source

Positron-electron annihilation momentum transfer to trapped deuterons

AIP Advances, 2019
The probability of positron annihilation momentum transfer to a trapped deuteron is calculated based on neutron measurements from 2H(d,n)3He reactions in deuterated palladium thin films. Deuterium gas loading in Pd thin films creates a high D/Pd fraction
Ryan Weed, Dante Sblendorio, Joshua Machacek, Bala Ramamurthy, Gabrielle Laguisma   +4 more
doaj   +1 more source

Few Body Effects in the Electron and Positron Impact Ionization of Atoms

Atoms, 2021
Triple differential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of energy sharing geometries where a number of significant few body effects compete to define the shape of the TDCS ...
R.I. Campeanu, Colm T. Whelan
doaj   +1 more source

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
doaj   +1 more source