scholarly journals Low energy nuclear scattering and sub-threshold spectra from a multi-channel algebraic scattering theory

2006 ◽  
Author(s):  
K. Amos
Keyword(s):  
Scattering Theory ◽  
Low Energy ◽  
Nuclear Scattering

Low-energy parameters in nonrelativistic scattering theory

1983 ◽  
Vol 148 (2) ◽  
pp. 308-326 ◽  
Author(s):  
S Albeverio ◽  
D Bolle ◽  
F Gesztesy ◽  
R Høegh-Krohn ◽  
L Streit
Keyword(s):  
Scattering Theory ◽  
Low Energy ◽  
Nonrelativistic Scattering Theory ◽  
Energy Parameters ◽  
Nonrelativistic Scattering

ANALYSIS OF THERMAL VIBRATIONS AND INCOMMENSURATE LAYERS BY LOW ENERGY ELECTRON DIFFRACTION

1997 ◽  
Vol 04 (03) ◽  
pp. 469-478 ◽  
Author(s):  
W. MORITZ ◽  
J. LANDSKRON ◽  
T. GRÜNBERG
Keyword(s):  
Multiple Scattering ◽  
Scattering Theory ◽  
Low Energy ◽  
Multiple Diffraction ◽  
Low Energy Electron Diffraction ◽  
Anharmonic Vibrations ◽  
Recent Developments ◽  
Low Energy Electron ◽  
Thermal Vibrations

The multiple scattering theory of LEED is briefly reviewed, and recent developments concerning the analysis of thermal vibrations with LEED and the analysis of lattice modulations in incommensurate layers are discussed. Usually only isotropic thermal vibrations have been considered in LEED structure analyses. This restriction can be overcome by an extension of the theory to anisotropic and anharmonic vibrations, allowing not only a higher precision in the determination of structure parameters but also the study of dynamical processes with LEED. In the case of incommensurate layers the satellite reflections arise from multiple diffraction as well as from modulations in the adsorbate or substrate lattice. It is shown that an approximation can be introduced in the multiple scattering formalism to calculate the satellite intensities. The method can be applied to incommensurate layers as well as to higher order commensurate layers.

TIME DELAY IN SEMICLASSICAL SCATTERING THEORY

1995 ◽  
Vol 10 (33) ◽  
pp. 2509-2517
Author(s):  
M.P. PATO ◽  
M.S. HUSSEIN
Keyword(s):  
Time Delay ◽  
Effective Potential ◽  
Scattering Theory ◽  
Semiclassical Approximation ◽  
Asymptotic Series ◽  
Complex Potentials ◽  
Nuclear Scattering ◽  
Asymptotic Evaluation ◽  
Repulsive Potentials ◽  
Semiclassical Scattering

An asymptotic evaluation of the time delay in the context of the semiclassical approximation is performed. It is shown that it is related to Stokes’s discontinuities of the asymptotic series caused by singularities determined by the turning points and points of equilibrium of the effective potential in the complex r-plane. The theory is applied to the repulsive potentials inversely proportional to the fourth and the sixth power of the distance. The case of complex potentials, usually considered in nuclear scattering is also discussed.

Importance of the nucleon Fermi motion in the pion–nucleus elastic scattering

1977 ◽  
Vol 55 (24) ◽  
pp. 2158-2165 ◽  
Author(s):  
K. Nakano ◽  
Chi-Shiang Wu
Keyword(s):  
Elastic Scattering ◽  
Multiple Scattering ◽  
Scattering Theory ◽  
Scattering Amplitude ◽  
Low Energy ◽  
Multiple Scattering Theory ◽  
Fermi Motion ◽  
Energy Scattering ◽  
Careful Treatment ◽  
Nucleus Scattering

The importance of the nucleon Fermi motion in π–nucleus elastic scattering is investigated in the framework of the multiple scattering theory. Conventional factorization approximations on the π–nucleus scattering amplitude are compared with calculations that take into account the nucleon Fermi motion by using π–12C as an example. The importance of a careful treatment of the Fermi motion in low energy scattering will be stressed.

STOPPING CROSS SECTIONS IN CARBON FOR LOW-ENERGY ATOMS WITH

1963 ◽  
Vol 41 (9) ◽  
pp. 1424-1442 ◽  
Author(s):  
J. H. Ormrod ◽  
H. E. Duckworth
Keyword(s):  
Monte Carlo ◽  
Cross Section ◽  
Atomic Number ◽  
Cross Sections ◽  
Monte Carlo Calculation ◽  
Low Energy ◽  
Energy Interval ◽  
Nuclear Scattering

The electronic stopping cross sections in carbon for atomic projectiles with [Formula: see text] have been determined in the energy interval from 10 to 140 kev. In doing so a Monte Carlo calculation was used to subtract from each experimentally observed cross section the contribution which arises from nuclear scattering. The trend of the results thus obtained agrees well with theory. In addition, however, a periodic dependence of Sε on the atomic number of the projectile is observed.

Rotational tomographic reconstruction of multiple in-line holograms

2000 ◽  
Vol 78 (11) ◽  
pp. 1005-1016 ◽  
Author(s):  
M R.A. Shegelski ◽  
T A Rothwell
Keyword(s):  
Scattering Theory ◽  
Optical Axis ◽  
Tomographic Reconstruction ◽  
Depth Resolution ◽  
Low Energy ◽  
Atomic Resolution ◽  
Low Energy Electron ◽  
Almost All ◽  
Theoretical Results ◽  
Axis Passing

Calculated electron in-line holograms, for the low-energy electron point source (LEEPS) microscope and based on scattering theory, give reconstructions that exhibit atomic resolution perpendicular to the optical axis. The depth resolution is not as sharp, and spurious peaks also result. We show that overall atomic resolution in the reconstruction of LEEPS in-line holograms can be obtained by using a tomographic approach. We examine a few reconstructions for holograms obtained by rotating the object about an axis passing through the object and parallel to the screen. We show that the reconstructions obtained from a small number of such "rotational tomographic holograms" can be combined in a manner such that almost all spurious peaks are eliminated and almost all atomic peaks are retained. The experimental implications of our theoretical results are discussed. PACS No.: 61.14Nm

The influence of foil roughness on low-energy stopping powers: calculations based on multiple-scattering theory

1993 ◽  
Vol 5 (33A) ◽  
pp. A293-A294 ◽  
Author(s):  
J E Valdes ◽  
G Martinez Tamayo ◽  
N R Arista ◽  
G H Lantschner ◽  
J C Eckardt
Keyword(s):  
Multiple Scattering ◽  
Scattering Theory ◽  
Low Energy ◽  
Multiple Scattering Theory
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