Results 271 to 280 of about 4,144,436 (328)

Scattering Matrix of Radioactive States

Physical Review, 1940
The method of complex eigenvalues is generalized to many dimensional problems by means of the scattering matrix. It is essential to allow for the existence of a background matrix on which the resonance is superposed. The "radioactive state" (i.e., the state with complex energy for which waves in all disintegration channels are outgoing) determines the ...
openaire   +1 more source

N.N. Bogolyubov and the scattering matrix

Russian Mathematical Surveys, 1994
Summary: One of the most important contributions of N. N. Bogolyubov to quantum field theory is, undoubtedly, the method he created of direct construction of the scattering matrix without use of the Hamiltonian formalism or any other forms of the equations of motion, but starting from general requirements, which are generally considered necessary to ...
openaire   +2 more sources

Conductance of an array of elastic scatterers: A scattering-matrix approach

Physical Review B, 1988
In the past, the conductance of disordered systems has been extensively studied with use of the Anderson tight-binding Hamiltonian. In this paper we use a different model, which views the semiconductor as regions of free propagation with occasional elastic scattering by a random array of scatterers. Each impurity is characterized by a scattering matrix
, Cahay, , McLennan, , Datta
openaire   +2 more sources

Derivative Matrix and Scattering Matrix

1993
R.Kronig [1] was the first to point out, on the basis of his and Kramers’ [2] work, that the principle of causality must entail some properties of the collision and scattering matrices. Starting from Kronig’s suggestion, Schutzer and Tiomno [3] gave, for non relativistic particles, a derivation of the well known theorem [4] that the poles of the ...
openaire   +1 more source

Scattering matrix measurements

Optics & Laser Technology, 1993
Abstract A technique is proposed to measure the components of the 2 x 2 scattering matrix of a target. Both relative amplitudes and phase are measured. Absolute amplitudes require irradiance measurements involving a reference scatterer to calibrate the incidence irradiance.
openaire   +1 more source

Scattering matrix application

Proceedings of the IEEE, 1965
The use of the scattering matrix leads to a formulation of radar reflectivity that is independent of radar polarization, target range, and target rotation about the line of sight. The resulting formulation is applied to the problem of object recognition in free space. Experimental results for right circular cones are presented.
openaire   +1 more source

The Scattering Matrix and the Scattering Cross-Section

1990
In this chapter we will get to know the formalism that is used to describe reactions in high energy physics. These reactions might involve scattering processes or decay and production of particles. The central role here is played by the scattering matrix S, which was introduced by Wheeler and Heisenberg (Wheeler 1937; Heisenberg 1943, 1944).
openaire   +1 more source

Insensitivity of the Scattering Matrix

Physical Review, 1956
Ekstein, H., Tanaka, Katsumi
openaire   +2 more sources

Scattering Matrix and Observables in Scattering and Decays

2013
As an interlude in the analysis of canonical field quantization, this section describes important concepts of scattering theory for Lorentz covariant quantum field theories that will be needed for the calculation of observables such as scattering cross sections and decay probabilities.
openaire   +1 more source

Computation of the scattering matrix of guided acoustical propagation by the Wave Finite Element approach

, 2016
A. Kessentini, M. Taktak, M. A. B. Souf, O. Bareille, M. Ichchou, M. Haddar   +5 more
semanticscholar   +1 more source