• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Thèse de Habilitation à Diriger des Recherches
DOI
10.11606/T.43.2015.tde-10092015-113726
Document
Auteur
Nom complet
Nelson Carlin Filho
Adresse Mail
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 1999
Jury
Vanin, Vito Roberto (Président)
Faria, Nelson Velho de Castro
Gomes, Paulo Roberto Silveira
Ribas, Roberto
Silveira, Enio Frota da
Titre en portugais
Escalas temporais para reações entre íons-pesados leves
Mots-clés en portugais
Física nuclear
Íons pesados
Resumé en portugais
Com o objetivo de contribuir para um melhor entendimento da dinãmica de reações nucleares, foram determinadas escalas temporais para sistemas envolvendo íons-pesados leves, através de duas técnicas distintas (flutuações estatísticas e correlações a pequenos momentos relativos), sensiveis a diferentes estágios de evolução temporal. Para a técnica de flutuações estatísticas, foram realizadas medidas de seções de choque para processos onde ocorre a emissão binária de fragmentos complexos, utilizando técnicas de coincidência cinemática, para o sistema ’ANTPOT.16 O’ + ’ANTPOT.10 B’ no intervalo de 22 MeV ’
Titre en anglais
Timescales for reactions between light-heavy ions
Mots-clés en anglais
Heavy ions
Nuclear physics
Resumé en anglais
8inary decay cross seclion measuremenls have been performed for lhe syslems 160 + 108 al 22 MeV _:: Ec.M _:: 24.5 MeV (iSEc.M - 20 keV) and 17 MeV .<::.Ec.M .::_25 MeV (iSEcM - 190 keV ) and for lhe syslem 19F + 12C al 22 MeV .::_Ec.M .<:_24.5 MeV (iSEc.M - 20 keV). The binary fragmenls were identified by lhe kinematic coincidence technique. The excitation functions for these systems show strong fluctuations and their average widths were obtained through the analysis of energy correlation functions. The small widths observed for lhe 160 + 108 (about 20 keV) and 19F + 12C (about 40 keV) systems, correspond to an intermediate system time scale o f about 2 x 1 o·20 s which is larger than its revolution time. These features suggest lhe presence of lhe fusion-fission mechanism. For lhe 160 + 108 system, larger widths (aboul 350 keV) were also observed which are related to a faster process. These aspects are expected for a process where the time scale is comparable to lhe intermediate system revolution time, like an orbiting mechanism. Theoretical predictions for fusion-fission and orbiting mechanisms were compared to lhe experimental results and a good agreement was observed.
 
AVERTISSEMENT - Regarde ce document est soumise à votre acceptation des conditions d'utilisation suivantes:
Ce document est uniquement à des fins privées pour la recherche et l'enseignement. Reproduction à des fins commerciales est interdite. Cette droits couvrent l'ensemble des données sur ce document ainsi que son contenu. Toute utilisation ou de copie de ce document, en totalité ou en partie, doit inclure le nom de l'auteur.
1999CarlinFilho.pdf (7.82 Mbytes)
Date de Publication
2015-09-14
 
AVERTISSEMENT: Apprenez ce que sont des œvres dérivées cliquant ici.
Tous droits de la thèse/dissertation appartiennent aux auteurs
CeTI-SC/STI
Bibliothèque Numérique de Thèses et Mémoires de l'USP. Copyright © 2001-2019. Tous droits réservés.