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Contribution to the study of alpha-alpha interaction; Contribution a l'etude de l'interaction alpha - alpha

Abstract

Two sets of measurements of the {alpha}-{alpha} elastic scattering differential cross section are presented. The first set - angular distributions from 50 up to 120 MeV - shows two new resonances, 6{sup +} and 8{sup +}, at 25 and 57 MeV. Complex phase shifts are extracted from the data and a phenomenological potential is given. A description of the 3 {alpha}-particle 0{sup +} states in C{sup 12} is made with this interaction potential. The second set - excitation curves between 20 and 50 MeV - allows investigation of the Be{sup 8} level structure within this energy range - It identifies the 16.6 and 16.9 MeV states as 2{sup +}, but the rise of inelastic processes at higher energies makes further identification of spins and parities more and more difficult. (author) [French] Deux series de mesures de la section efficace differentielle de diffusion {alpha}-{alpha} sont presentees. La premiere - distributions angulaires entre 50 et 120 MeV - fait apparaitre deux nouvelles resonances, 6{sup +} et 8{sup +}, a 25 et 57 MeV d'excitation. Des dephasages complexes en sont extraits et un potentiel phenomenologique est presente. Une etude des etats 0{sup +} a parentage (3{alpha}) de {sup 12}C est faite a partir  More>>
Authors:
Darriulai, P [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Mar 01, 1965
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-2786
Resource Relation:
Other Information: TH: These ES sciences physiques; 125 refs
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; ANGULAR DISTRIBUTION; BERYLLIUM 8; CARBON 12; CLUSTER MODEL; DIFFERENTIAL CROSS SECTIONS; DIFFUSION; ELASTIC SCATTERING; MEV RANGE 10-100; PARTICLE INTERACTIONS; PHASE SHIFT
OSTI ID:
20706584
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France); Faculte des Sciences de l'Universite de Paris, Centre d'Orsay, 91 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR05R2786021789
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
96 pages
Announcement Date:
Apr 27, 2006

Citation Formats

Darriulai, P. Contribution to the study of alpha-alpha interaction; Contribution a l'etude de l'interaction alpha - alpha. France: N. p., 1965. Web.
Darriulai, P. Contribution to the study of alpha-alpha interaction; Contribution a l'etude de l'interaction alpha - alpha. France.
Darriulai, P. 1965. "Contribution to the study of alpha-alpha interaction; Contribution a l'etude de l'interaction alpha - alpha." France.
@misc{etde_20706584,
title = {Contribution to the study of alpha-alpha interaction; Contribution a l'etude de l'interaction alpha - alpha}
author = {Darriulai, P}
abstractNote = {Two sets of measurements of the {alpha}-{alpha} elastic scattering differential cross section are presented. The first set - angular distributions from 50 up to 120 MeV - shows two new resonances, 6{sup +} and 8{sup +}, at 25 and 57 MeV. Complex phase shifts are extracted from the data and a phenomenological potential is given. A description of the 3 {alpha}-particle 0{sup +} states in C{sup 12} is made with this interaction potential. The second set - excitation curves between 20 and 50 MeV - allows investigation of the Be{sup 8} level structure within this energy range - It identifies the 16.6 and 16.9 MeV states as 2{sup +}, but the rise of inelastic processes at higher energies makes further identification of spins and parities more and more difficult. (author) [French] Deux series de mesures de la section efficace differentielle de diffusion {alpha}-{alpha} sont presentees. La premiere - distributions angulaires entre 50 et 120 MeV - fait apparaitre deux nouvelles resonances, 6{sup +} et 8{sup +}, a 25 et 57 MeV d'excitation. Des dephasages complexes en sont extraits et un potentiel phenomenologique est presente. Une etude des etats 0{sup +} a parentage (3{alpha}) de {sup 12}C est faite a partir de ce potentiel. La seconde - courbes d'excitation s'etendant de 20 a 50 MeV - met en evidence la structure de {sup 8}Be dans cette region. Elle montre que les niveaux a 16,6 et 16,9 MeV sont des 2{sup +} mais l'importance des processus inelastiques rend difficile l'identification des niveaux d'excitation plus elevee. (auteur)}
place = {France}
year = {1965}
month = {Mar}
}