Published November 1985 | Version v1
Report Open

Coupled channel formalism and ECIS programs

Creators

Description

A new ECIS code is under study. It includes all the improvements which seemed to be necessary, including P. Moldauer's work on compound nucleus. Dirac formalism, used since some years to study elastic scattering was generalized to inelastic scattering. Besides the scalar and the vector potential, this formalism uses a ''tensor'' potential including a long range Coulomb contribution even for neutron scattering. Dirac equation can be written as a Schroedinger equation which is fully equivalent only for elastic scattering. Coupled Dirac or Schroedinger equations can be solved by iterations. Comparison of their results justifies the use of deformed spin-orbit potentials

Availability note (English)

MF available from INIS under the Report Number.

Abstract (French)

Un nouveau programme ECIS est en preparation. Il incorpore toutes les ameliorations qui ont paru necessaires, y compris les travaux de P. Moldauer sur le noyau compose. Le formalisme de Dirac, utilise depuis plusieurs annees pour la diffusion elastique a ete generalise a la diffusion inelastique. En plus des potentiels scalaire et vecteur, ce formalisme utilise un potentiel ''tenseur'' qui contient une contribution a longue portee d'origine coulombienne, presente meme pour des neutrons. On peut reduire l'equation de Dirac a une equation de Schroedinger qui ne lui est absolument equivalente que pour la diffusion elastique. Equations de Dirac ou de Schroedinger couplees peuvent etre resolues par iterations. La comparaison des resultats permet en particulier de justifier l'emploi de potentiel spin-orbite deforme

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Additional details

Additional titles

Original title (French)
Formalisme des voies couplees et programmes ECIS

Publishing Information

Imprint Pagination
12 p.
Report number
CEA-CONF--8259

Conference

Title
Specialists meeting on the use of the optical model for the calculation of neutron cross sections below 20 MeV.
Dates
13-15 Nov 1985.
Place
Paris (France).

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
17076089
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Resource subtype / Literary indicator
Conference
Descriptors DEI
COMPUTER CALCULATIONS; CONVERGENCE; COULOMB CORRECTION; COUPLED CHANNEL THEORY; DIRAC EQUATION; ELASTIC SCATTERING; INELASTIC SCATTERING; ITERATIVE METHODS; KEV RANGE 100-1000; MEV RANGE 01-10; NEUTRON REACTIONS; NUCLEAR POTENTIAL; NUMERICAL SOLUTION; SCHROEDINGER EQUATION; TENSOR FORCES
Descriptors DEC
BARYON REACTIONS; CORRECTIONS; DIFFERENTIAL EQUATIONS; ENERGY RANGE; EQUATIONS; FIELD EQUATIONS; HADRON REACTIONS; KEV RANGE; MEV RANGE; NUCLEAR REACTIONS; NUCLEON REACTIONS; PARTIAL DIFFERENTIAL EQUATIONS; POTENTIALS; SCATTERING; WAVE EQUATIONS

Optional Information

Secondary number(s)
SPhT--85-151.