The first experiments on electron scattering were completed before the “official” discovery of this particle by J. J. Thomson. In spite of this, our knowledge of cross sections is still far from ...complete.More recent experiments had some unexpected results, like selective fragmentation of DNA constituents by low-energy electrons, or “reverse” phenomena, i.e., synthesis of simple amino acids from inorganic precursors, triggered by slow electrons. The most recent need for cross sections comes from modeling plasmas for industrial and thermonuclear applications, and atmospheres of solar and extra-solar planets.Both fundamental research (experiments, theory, reviews) and applications of electron-scattering cross sections in various processes are welcome.
The transport cross sections and integrated cross sections are calculated for interactions of hydrogen and nitrogen atoms and ions (in the ground and excited states) for use in plasma science and ...hypersonic flows theory. The data for the transport cross sections are given in the energy range typically needed (or broader) for those applications: 10−6-37 hartree (around 2.7⋅10−5eV-1 keV). The reported cross sections are calculated from the high quality ab initio potential energy curves with additional extrapolation for highly repulsive region. The methods and energy range are discussed in the context of LXCat and IAEA (ALADDIN and CollisionDB) databases. The uncertainty of data is also estimated.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
A measurement is presented of the associated production of a single top quark and a Z boson. The study uses data from proton–proton collisions at s=13TeV recorded by the CMS experiment, corresponding ...to an integrated luminosity of 35.9 fb−1. Using final states with three leptons (electrons or muons), the tZq production cross section is measured to be σ(pp→tZq→Wbℓ+ℓ−q)=123−31+33(stat)−23+29(syst)fb, where ℓ stands for electrons, muons, or τ leptons, with observed and expected significances of 3.7 and 3.1 standard deviations, respectively.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Geant4model for neutrino nucleon/nucleus integral cross sections Grichine, V.M.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
August 2023, 2023-08-00, Volume:
1053
Journal Article
Peer reviewed
The Geant4model for neutrino nucleon/nucleus integral cross sections, based on selection of the existing physical models, is discussed. The comparison of the model predictions with experimental data ...for quasi-elastic, inelastic and total neutrino nucleon cross sections is presented.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
We investigate theoretically productions of Λ3,4H bound states in the exothermic (K−, π0) reactions on 3,4He targets at pK−= 1.0 GeV/c in a distorted-wave impulse approximation with the optimal ...Fermi-averaging K−p→π0Λt matrix. We calculate angular distributions of the laboratory differential cross sections dσ/dΩlab and the integrated cross sections σlab for a JP=0+ ground state and a JP=1+ excited state of HΛ4 at π0 forward-direction angles of θlab= 0∘–20∘, and those for a JP=1/2+ ground state of HΛ3. The production of a JP=3/2+ excited state of HΛ3 as a virtual state is also evaluated. The comparison in dσ/dΩlab and σlab between HΛ4 and HΛ3 provides examining the mechanism of the production and structure of Λ3,4H, as well as in the endothermic (π−, K0) reactions at pπ−= 1.05 GeV/c. This investigation confirms the feasibility of lifetime measurements of Λ3H at the J-PARC experiments.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
This work provides the first cross section data set of DNA constituents for an impact of electrons in the energy range between about 10eV and 1keV on a DNA target. The data set is designed for an ...implementation in Monte Carlo simulations and consists of model functions, taking into account elastic scattering, ionization and excitation interactions with the DNA constituents tetrahydrofuran, trimethylphosphate, pyrimidine and purine. It was developed on the basis of experimentally determined absolute differential and total scattering cross sections in accordance with the available literature data. The data set will be available in the Geant4-DNA toolkit to allow secondary electron transport in a DNA-like medium down to the ionization threshold.
•Cross section data set of DNA constituents for secondary electron-impact.•Based on absolute experimental differential and total scattering cross sections.•Suitable for implementation in track structure simulations.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
The quantum state-resolved dynamics studies of the C+ + H2(v = 0, j = 0) → CH+ + H reaction were carried out using time-dependent wave packet method based on the potential energy surface (PES) ...reported by Li et al. The dynamics properties such as reaction probability, integral cross section, differential cross section, the rovibrational state distribution of product and rate constant were calculated and compared with available theoretical and experimental values. The results indicated that present values are in general good agreement with the experimental data. The forward–backward symmetry scattering signals shows that the “complex-forming” reaction mechanism dominates the title reaction. The rate constants of the initial state (v = 0, j = 0) were studied in the temperature range from 10 to 5000 K. The results indicated that the rate constant sharply increases with the increase of temperature.
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The multi-group cross-section generation capability for neutrons is implemented in the FRENDY nuclear data processing code. ACE-formatted files are used as the source of nuclear data instead of ...ENDF-formatted files since FRENDY already has the capability to generate pointwise cross sections in the ACE format. The several distinguished features are implemented for the multi-group generation capability, e.g. explicit consideration of resonance interference effect among nuclides, enhanced resonance treatment for various nuclear reactions, and accurate numerical integration of thermal cross sections. Verification calculations of the newly implemented capability are carried out through the comparison with the NJOY nuclear data processing code. Cross-section generations for all nuclides in JENDL-4.0, -4.0u, -
, ENDF/B-VII.1, -VIII.0, JEFF-3.3, and TENDL-2019 are carried out without unexpected processing issues, except for Pu-238 of TENDL-2019 that includes inconsistent data. The verification results indicate that the multi-group cross sections generated by FRENDY are consistent with those generated by NJOY. Now FRENDY can generate not only the pointwise cross sections for continuous energy Monte-Carlo codes but also the multi-group cross sections for deterministic neutronics analysis codes.
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BFBNIB, GIS, IJS, KISLJ, NUK, PNG, UL, UM, UPUK
This article reports various cross sections of electron scattering from C5H10 isomers, viz. 1-pentene, 2-methyl-2-butene, cis-2-pentene, trans-2-pentene and 2-methyl-1-butene. These molecules are ...scarcely investigated in terms of such interactions, especially cis-2-pentene, trans-2-pentene and 2-methyl-1-butene molecules for which no previous cross section data is available. The results presented here are obtained by the quantum mechanical formalism using optical potential method, for a wide energy range from the ionization threshold of the target to 5000 eV. Geometrical screening correction is included in this calculation to account for the overlapping charge densities of different atoms present in a molecule. Most of the data presented here are reported for the first time. The effect of structural difference on cross section is investigated through isomeric effect.
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•Theoretical studies of electron scattering from different C5H10 isomers are reported.•Cross sections for different channels are computed using Complex Optical Potential.•Cross section of cis and trans-2-pentene and 2-methyl-1-butene are reported for the first time.•Geometric screening correction is employed to refine the cross section.•The isomeric effect is visualized by comparing cross section to 2-methyl-2-butene.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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