scholarly journals Electron Collisions with Metastable Helium

1996 ◽  
Vol 49 (2) ◽  
pp. 515 ◽  
Author(s):  
Marcus Jacka ◽  
Jennifer Kelly ◽  
Birgit Lohmann ◽  
Stephen Buckman
Keyword(s):  
Excited States ◽  
Electron Scattering ◽  
Low Energy ◽  
Angular Distributions ◽  
Theoretical Studies ◽  
Electron Collisions ◽  
Metastable Helium ◽  
First Results

Measurements and theoretical studies of electron scattering from the metastable 21,3S excited states of helium are briefly reviewed. An apparatus developed for the study of low energy differential scattering from metastable excited states is discussed in detail and the first results of angular distributions for electrons superelastically scattered from the 21,3S states at incident energies of 5, 10 and 30 eV are presented.

The (K−,π−) and (π+, K+) Reactions and Λ-Hypernuclear Polarization

1994 ◽  
Vol 117 ◽  
pp. 17-53 ◽  
Author(s):  
K. Itonaga ◽  
T. Motoba ◽  
M. Sotona
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Cross Sections ◽  
Ground State ◽  
Weak Decay ◽  
Angular Distributions ◽  
Theoretical Studies ◽  
Excitation Functions ◽  
Unnatural Parity ◽  
Natural Parity

The theoretical studies of (K−, π−) and (π+, K+) reactions on p-shell targets are presented in the DWIA framework with use of the elementary spin-nonflip and spin-flip amplitudes. Calculations can explain the available experimental data of excitation functions and angular distributions of the (K−, π−) reactions at pK−=800 MeV/c and the (π+, K+) reactions at pπ+ = 1.04 GeV/c. Characteristic and distinguished features of the excitation functions and cross sections are exhibited. Especially it is demonstrated that the (K−, π−) reactions at pK−=1.1 GeV/c and 1.5 GeV/c can excite the unnatural parity states with comparable strength to the natural parity ones. Further interesting is that the (π+, K+) and (K−, π−) reactions with ∼1 GeV/c incident beams can be shown to produce very large polarizations of the produced hypernuclear states. Taking the subsequent deexcitation processes of the excited states into account, we have evaluated the hypernuclear polarization and Λ-spin polarization of the ground state and/or the ground-doublet states at the hypernuclear weak-decay stage, which would play a role in the hypernuclear coincidence experiment.

Low-energy electron scattering from the water molecule: Angular distributions and rotational excitation

1998 ◽  
Vol 108 (10) ◽  
pp. 4002-4012 ◽  
Author(s):  
F. A. Gianturco ◽  
S. Meloni ◽  
P. Paioletti ◽  
R. R. Lucchese ◽  
N. Sanna
Keyword(s):  
Water Molecule ◽  
Electron Scattering ◽  
Low Energy ◽  
Energy Electron ◽  
Angular Distributions ◽  
Rotational Excitation ◽  
Low Energy Electron

scholarly journals Relativistic B-Spline R-Matrix Calculations for Electron Collisions with Ytterbium

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 47
Author(s):  
Kathryn R. Hamilton ◽  
Klaus Bartschat ◽  
Oleg Zatsarinny
Keyword(s):  
Experimental Data ◽  
Electron Scattering ◽  
Cross Sections ◽  
Matrix Method ◽  
Model Potential ◽  
Electron Collisions ◽  
R Matrix ◽  
B Spline ◽  
Potential Approach

We have applied the full-relativistic Dirac B-Spline R-matrix method to obtain cross sections for electron scattering from ytterbium atoms. The results are compared with those obtained from a semi-relativistic (Breit-Pauli) model-potential approach and the few available experimental data.

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