• 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
 
 
Doctoral Thesis
DOI
https://doi.org/10.11606/T.43.2021.tde-21062021-192002
Document
Author
Full name
Osvaldo Camargo Botelho dos Santos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2021
Supervisor
Committee
Lichtenthaler Filho, Rubens (President)
Frederico, Tobias
Niello, Jorge Oscar Fernandez
Shorto, Julian Marco Barbosa
Vanin, Vito Roberto
Title in Portuguese
Estudo do espalhamento elástico e reações do projétil 8Li em alvos de massa leve, intermediária e pesada
Keywords in Portuguese
Espalhamento elástico.
Feixes radioativos
Reações nucleares
Transferência
Abstract in Portuguese
Neste trabalho, foi estudada a colisão do projétil radioativo 8Li em alvos de massa leve, intermediária e pesada. Foram medidas distribuições angulares quasi-elásticas de 8Li em 9Be (E lab =23,7 MeV), 58Ni (E lab =23,9; 26,1; 28,7 e 30,0 MeV) e 120Sn (E lab =21,7 e 25,8 MeV). Uma intensa produção de 7Li foi observada durante os experimentos, cuja origem poderia ser a quebra de 8Li em 7Li+n, ou uma reação de transferência de nêutrons (stripping) do projétil 8Li para o alvo. Foram medidas distribuições angulares e de energia do 7Li. Cálculos de canais acoplados (CC) considerando a excitação do 8Li para os estados (0,98 MeV;1+) e (2,26 MeV;3+), bem como cálculos de canais acoplados com discretização do contnuo (CDCC), não foram capazes de explicar os dados de espalhamento quasi-elástico. Esses dados e os de produção de 7Li foram descritos simultaneamente por cálculos de canais acoplados em reação (CRC) considerando o acoplamento com o canal de transferência de 1 nêutron para estados excitados do núcleos de recuo 59Ni. Foram realizados cálculos utilizando o formalismo de Ichimura-Austern-Vincent (IAV) para descrever, com sucesso, as distribuições angulares e em energia do 7Li. Para o sistema 8Li+ 9Be foi realizado um cálculo de Modelo Óptico (MO).
Title in English
Study of the elastic scattering and reactions of 8Li on light, medium and heavy mass targets
Keywords in English
Elastic scattering
Nuclear reactions
Radioactive beams
Transfer
Abstract in English
In this work, the collision of the unstable 8Li projectile on light, intermediate and heavy mass targets has been studied. Quasi-elastic angular distributions of 8Li on 9Be (E lab =23.7 MeV), 58Ni (E lab =23.9, 26.1, 28.7, 30.0 MeV) and 120Sn (E lab =21.7, 25.8 MeV) have been measured. An intense 7Li production has been observed during the experiments whose origin could be either the 8Li breakup into 7Li+n, or a neutron transfer reaction (stripping) from the 8Li projectile to the target. Angular and energy distributions of 7Li have been measured. Coupled Channel (CC) calculations considering the 8Li excitation to the (0.98 MeV, 1+) and (2.26 MeV, 3+) states, as well as Continuum-Discretized Coupled-Channels (CDCC) calculations were unable to describe the 8Li angular distributions. Both, the 8Li and the 7Li angular distributions have been simultaneously described by Coupled Reaction Channel (CRC) calculations, considering the coupling to the one neutron stripping reaction to excited states of the recoil 59Ni nucleus. Ichimura-Austern-Vincent (IAV) calculations have been performed to successfully describe the 7Li angular and energy distributions for both, the 58Ni and 120Sn targets. For the 8Li+9Be system, an optical model calculation was performed.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Tese_OCBSantos.pdf (3.68 Mbytes)
Publishing Date
2021-06-24
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2021. All rights reserved.