scholarly journals Transverse Momentum Transfer Distributions Following Single Ionization in 3.6 MeV/amu Au53+ + He Collisions: A 4-Body Classical Treatment

Atoms ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 68 ◽  
Author(s):  
François Frémont
Keyword(s):  
Transverse Momentum ◽  
Momentum Transfer ◽  
Cross Sections ◽  
Electron Emission ◽  
Differential Cross ◽  
Classical Model ◽  
Equations Of Motion ◽  
Free Electrons ◽  
Hamilton Equations ◽  
Momentum Distributions

A four-body classical model based on the resolution of Hamilton equations of motion was used here to determine and analyze ionization doubly-differential cross sections following 3.6 MeV/amu Au53+ + He collisions. Our calculation was not able to reproduce the binary peaks experimentally observed in the transverse momentum distributions for electron emission energies larger than 10 eV. Surprisingly, by introducing a large number of free or quasi-free electrons that followed the projectile at the same velocity, the agreement between the experiment and our calculation was improved, since our model reproduced, at least qualitatively, the experimental binary peaks. The origin of the presence of such electrons is discussed.

Electron scattering from germanium tetrafluoride

RSC Advances ◽  
2014 ◽  
Vol 4 (109) ◽  
pp. 63817-63823 ◽  
Author(s):  
Biplab Goswami ◽  
Rahla Naghma ◽  
Bobby Antony
Keyword(s):  
Momentum Transfer ◽  
Electron Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Shape Resonance ◽  
Differential Cross Sections ◽  
Rotational Excitation ◽  
R Matrix ◽  
High Energies ◽  
Germanium Tetrafluoride

R-matrix and SCOP methods are used at low and high energies respectively to find e-GeF4 TCS. Electronic and rotational excitation, momentum transfer and elastic differential cross sections are also calculated. A shape resonance is observed at 5.7 eV.

On the Production of Hypernuclei Using Fast Kaons

1973 ◽  
Vol 51 (14) ◽  
pp. 1524-1533 ◽  
Author(s):  
Robert James Esch
Keyword(s):  
Wave Function ◽  
Mass Spectrum ◽  
Momentum Transfer ◽  
Cross Sections ◽  
Differential Cross ◽  
Interaction Model ◽  
Impulse Approximation ◽  
Direct Interaction ◽  
Single Scattering ◽  
Nuclear Targets

The differential cross sections for the production of definite lambda hypernuclear states are calculated for the reaction n(K−, π−)Λ° on nuclear targets of helium, carbon, and oxygen at incident momenta from 500 to 800 MeV/c. A direct interaction model is used, employing the single scattering, impulse approximation. It is shown that these predictions are very sensitive to the three-momentum transfer and to the wave function of the bound lambda in the hypernucleus. Possible experimental consequences are discussed concerning the observation of hypernucleus production by studying the missing mass spectrum of the emitted pion.

scholarly journals Doubly and Triply Differential Cross Sections for Single Ionization of He by Fast Au53+ Using a Multi-Body Quasiclassical Model

Atoms ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 19
Author(s):  
François Frémont
Keyword(s):  
Quantum Mechanics ◽  
Cross Sections ◽  
Differential Cross ◽  
Present Model ◽  
Differential Cross Sections ◽  
Free Electrons ◽  
Single Ionization ◽  
Multi Body ◽  
Better Than ◽  
Binary Peak

A multi-body multi-center quasiclassical model was used to determine doubly- and triply-differential cross sections following single ionization in 3.6 MeV/amu Au53+ + He collisions. The present model improved recent calculations, in which free electrons were added in the collision to reproduce, at least qualitatively, the experimental binary peak. In the present calculations, the electrons, that were assumed to originate from the collisions of Au53+ with surfaces before colliding with the He target, were now considered to be in the field of the projectile, with nearly the same velocity. The agreement between the calculations and the experiment was improved, for both the doubly- and the triply-differential cross sections and was better than previous calculations based on quantum mechanics.

Absolute doubly differential cross sections for electron emission in collisions of 3.5-MeV/uFe17+andFe22+ions with He and Ar gas targets

1992 ◽  
Vol 46 (3) ◽  
pp. 1296-1302 ◽  
Author(s):  
D. H. Schneider ◽  
D. R. DeWitt ◽  
R. W. Bauer ◽  
J. R. Mowat ◽  
W. G. Graham ◽  
...  
Keyword(s):  
Cross Sections ◽  
Electron Emission ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Gas Targets ◽  
Ar Gas

Double differential cross sections for soft electron emission in ionization of hydrogen by bare carbon ions

1997 ◽  
Vol T73 ◽  
pp. 233-234 ◽  
Author(s):  
Lokesh C Tribedi ◽  
P Richard ◽  
D Ling ◽  
B dePaola ◽  
Y D Wang ◽  
...  
Keyword(s):  
Cross Sections ◽  
Electron Emission ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Carbon Ions

scholarly journals Measurement of the production cross section of pairs of isolated photons in pp collisions at 13 TeV with the ATLAS detector

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
◽  
G. Aad ◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Differential Cross ◽  
Production Cross ◽  
Atlas Detector ◽  
Differential Cross Sections ◽  
Proton Proton ◽  
Theoretical Predictions ◽  
Fixed Order ◽  
Isolated Photons

Abstract A measurement of prompt photon-pair production in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV is presented. The data were recorded by the ATLAS detector at the LHC with an integrated luminosity of 139 fb−1. Events with two photons in the well-instrumented region of the detector are selected. The photons are required to be isolated and have a transverse momentum of $$ {p}_{\mathrm{T}{,}_{\gamma 1(2)}} $$ p T , γ 1 2 > 40 (30) GeV for the leading (sub-leading) photon. The differential cross sections as functions of several observables for the diphoton system are measured and compared with theoretical predictions from state-of-the-art Monte Carlo and fixed-order calculations. The QCD predictions from next-to-next-to-leading-order calculations and multi-leg merged calculations are able to describe the measured integrated and differential cross sections within uncertainties, whereas lower-order calculations show significant deviations, demonstrating that higher-order perturbative QCD corrections are crucial for this process. The resummed predictions with parton showers additionally provide an excellent description of the low transverse-momentum regime of the diphoton system.

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