Results 1 to 10 of about 4,848 (208)

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

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   +2 more sources

The Resonant Effect of an Annihilation Channel in the Interaction of the Ultrarelativistic Electron and Positron in the Field of an X-ray Pulsar

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, Sergei P. Roshchupkin, Victor V. Dubov   +2 more
doaj   +2 more sources

Characterization of secondary-radiation background in X-ray flat-panel detectors during scanning proton beam irradiation. [PDF]

Med Phys
Abstract Background Secondary‐radiation background (BG) generated in kilovoltage X‐ray flat‐panel detectors (FPDs) under scanning proton beam irradiation has not been thoroughly analyzed. Purpose This study aimed to determine and mathematically model the characteristics of secondary‐radiation BG in FPDs under scanning proton beam irradiation.
Terunuma T, Takada K, Takao S, Osugi M, Miyamoto N, Asano S, Moriya S, Sakae T, Sakurai H.   +8 more
europepmc   +2 more sources

Anomalous Positron Lifetime in Single Crystal of Weyl Semimetal CoSi

Crystals, 2023
The positron annihilation lifetimes were measured using a 48V positron source in noncentrosymmetric cubic single crystals of CoSi, FeSi and MnSi. The following lifetimes were determined from the positron annihilation time spectra: 168(1) ps for CoSi, 114(
D. A. Salamatin, A. V. Bokov, M. G. Kozin, I. L. Romashkina, A. V. Salamatin, M. V. Mikhin, A. E. Petrova, V. A. Sidorov, A. V. Nikolaev, Z. Fisk, A. V. Tsvyashchenko   +10 more
doaj   +1 more source

New physics searches at the ILC positron and electron beam dumps

Journal of High Energy Physics, 2021
We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps. The dark photon, axion-like particles, and light scalar bosons are considered as new physics scenarios ...
Kento Asai, Sho Iwamoto, Yasuhito Sakaki, Daiki Ueda   +3 more
doaj   +1 more source

Constraints on heavy dark matter annihilation and decay from electron and positron cosmic ray spectra

SciPost Physics Proceedings, 2023
Annihilation or decay of dark matter (DM) could contribute to the electron and positron cosmic-ray flux, allowing for constraints on DM parameters from its measurement.
Holger Motz
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

Direct Decay of the Z^0 Boson into Ω_bcc and Ω_bbc Baryons [PDF]

فیزیک کاربردی ایران
Electron-positron annihilation experiments are crucial tools for testing the Standard Model due to the simplicity and clarity of the initial state.
tawfigh Osati
doaj   +1 more source

Efficient and surface site-selective ion desorption by positron annihilation

Scientific Reports, 2018
We compared positron- and electron-stimulated desorption (e+SD and ESD) of positive ions from a TiO2(110) surface. Although desorption of O+ ions was observed in both experiments, the desorption efficiency caused by positron bombardment was larger by one
Takayuki Tachibana, Takashi Yamashita, Masaru Nagira, Hisakuni Yabuki, Yasuyuki Nagashima   +4 more
doaj   +1 more source

Surfaces of colloidal PbSe nanocrystals probed by thin-film positron annihilation spectroscopy

APL Materials, 2013
Positron annihilation lifetime spectroscopy and positron-electron momentum density (PEMD) studies on multilayers of PbSe nanocrystals (NCs), supported by transmission electron microscopy, show that positrons are strongly trapped at NC surfaces, where ...
L. Chai, W. Al-Sawai, Y. Gao, A. J. Houtepen, P. E. Mijnarends, B. Barbiellini, H. Schut, L. C. van Schaarenburg, M. A. van Huis, L. Ravelli, W. Egger, S. Kaprzyk, A. Bansil, S. W. H. Eijt   +13 more
doaj   +1 more source