You need JavaScript to view this

The use of polarized deuterons beams and the determination of the optical model parameters; Utilisation de faisceaux de deutons polarises et determination des parametres du modele optique

Abstract

A general description of beams of polarized particles in nuclear reactions is studied; the various choices necessary to define the polarization parameters are discussed with regard to their consequences. The frequent occurrence of symmetry plane yields a set of relations among these parameters. The range of these parameters is studied in particular for a beam of particles of spin 1 and with a symmetry plane. Nuclear reactions involving two bodies are described in terms of the helicity formalism. With the use of the adopted set of polarization parameters, the polarization of the final state is studied for a given polarization in the initial state. An optical model for deuterons may consist of a scalar term, an L.S potential and tensor potentials built with the distance between the deuteron and the nucleus, its angular momentum or its relative momentum. Calculations have been made with the first two tensor potentials. Many authors have calculated a potential for deuterons starting from the nucleon-nucleus potential. These calculations are redone taking into account both the S and D waves of the deuteron. The various terms of the potential have been calculated with a set of different intrinsic wave functions. The use of a potential not  More>>
Authors:
Raynal, J [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jun 15, 1964
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-2511
Resource Relation:
Other Information: TH: These ES sciences physiques; 43 refs
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; D WAVES; DEUTERON BEAMS; ELASTIC SCATTERING; HELICITY; L-S COUPLING; NUCLEAR REACTIONS; OPTICAL MODELS; ORBITAL ANGULAR MOMENTUM; POLARIZED BEAMS; S WAVES; SCALAR FIELDS; SPIN
OSTI ID:
20793551
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Faculte des sciences de l'Universite de Paris, 75 - Paris (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR06R2511095220
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
96 pages
Announcement Date:
Dec 19, 2006

Citation Formats

Raynal, J. The use of polarized deuterons beams and the determination of the optical model parameters; Utilisation de faisceaux de deutons polarises et determination des parametres du modele optique. France: N. p., 1964. Web.
Raynal, J. The use of polarized deuterons beams and the determination of the optical model parameters; Utilisation de faisceaux de deutons polarises et determination des parametres du modele optique. France.
Raynal, J. 1964. "The use of polarized deuterons beams and the determination of the optical model parameters; Utilisation de faisceaux de deutons polarises et determination des parametres du modele optique." France.
@misc{etde_20793551,
title = {The use of polarized deuterons beams and the determination of the optical model parameters; Utilisation de faisceaux de deutons polarises et determination des parametres du modele optique}
author = {Raynal, J}
abstractNote = {A general description of beams of polarized particles in nuclear reactions is studied; the various choices necessary to define the polarization parameters are discussed with regard to their consequences. The frequent occurrence of symmetry plane yields a set of relations among these parameters. The range of these parameters is studied in particular for a beam of particles of spin 1 and with a symmetry plane. Nuclear reactions involving two bodies are described in terms of the helicity formalism. With the use of the adopted set of polarization parameters, the polarization of the final state is studied for a given polarization in the initial state. An optical model for deuterons may consist of a scalar term, an L.S potential and tensor potentials built with the distance between the deuteron and the nucleus, its angular momentum or its relative momentum. Calculations have been made with the first two tensor potentials. Many authors have calculated a potential for deuterons starting from the nucleon-nucleus potential. These calculations are redone taking into account both the S and D waves of the deuteron. The various terms of the potential have been calculated with a set of different intrinsic wave functions. The use of a potential not limited to scalar form yields good fits for cross-sections with nuclear radii which are greater than those necessary with a purely central potential. The experimental results obtained at Saclay for the polarization of deuterons elastically scattered by Ca are not compatible with the existence of an important tensor potential; they can be accounted for by an L.S coupling potential independent of the central potential but with very small radii. (author) [French] La description de faisceaux do particules polarisees dans les reactions nucleaires est etudiee de facon generale; les choix necessaires pour definir les parametres de polarisation sont discutes en fonction de leurs consequences. L'existence tres frequente d'un plan de symetrie entraine des relations entre les parametres adoptes. Les limitations de ces parametres sont etudiees specialement dans le cas d'un faisceau de particules de spin 1 ayant un plan de symetrie. Les reactions nucleaires a deux corps sont decrites dans le formalisme de l'helicite. A l'aide des coefficients de polarisation adoptes, on etudie la polarisation dans l'etat final avec etat initial polarise. Un potentiel optique pour deutons pout comprendre une partie scalaire, un couplage L.S et des potentiels tensoriels formes avec la distance du deuton au noyau, son moment angulaire ou son impulsion relative. Des calculs ont ete faits avec les deux premieres sortes de potentiels tensoriels. Plusieurs auteurs ont calcule un potentiel pour deutons a partir du modele optique nucleon oyau. Ces calculs sont repris en considerant l'onde S et l'onde D du deuton. Les differentes parties du potentiel ont ete calculees avec plusieurs fonctions d'onde intrinseque. L'utilisation de potentiels non uniquement scalaires permet d'obtenir de bons accords pour la section efficace avec des rayons nucleaires plus eleves que ceux necessaires avec un potentiel purement central. Les mesures experimentales de polarisation faites a Saclay pour la diffusion elastique de deutons sur le calcium sont en desaccord avec l'existence d'un potentiel tensoriel important ; elles peuvent etre reproduites en utilisant un couplage L.S. independant du potentiel central, mais avec des rayons tres faibles. (auteur)}
place = {France}
year = {1964}
month = {Jun}
}