• 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.43.2022.tde-17012023-220346
Document
Author
Full name
Erick Oscar Natividad Zevallos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2022
Supervisor
Committee
Guimaraes, Valdir (President)
Assuncao, Marlete Pereira Meira de
Linares, Roberto
Pires, Kelly Cristina Cezaretto
Rios, Jesus Lubian
Title in Portuguese
Investigação do espalhamento elástico dos núcleos A = 13 no alvo de 208Pb em energias intermediárias
Keywords in Portuguese
Canais acoplados
Espalhamento elástico
Feixes radioativos
Reações nucleares
Abstract in Portuguese
Neste trabalho, analisamos as distribuições angulares de espalhamento elástico obtidas para os sistemas 13B+208Pb (Elab = 254 MeV e Elab = 242 MeV), 13O+208Pb (Elab = 414 MeV) e 13C+208Pb (Elab = 390 MeV) e 13N+208Pb (Elab = 342 MeV) em energias intermediárias, em torno de cinco vezes acima da barreira Coulombiana para cada um dos sistemas. Os dados de 13B+208Pb (254 MeV) e 13O+208Pb (414 MeV) foram obtidos no laboratório de Lanzhou, China e já foram publicados. No caso do sistema 13C+208Pb (390 MeV) os dados também já foram publicados e analisados com cálculos de modelo óptico com resultados controversos. Os dados para os sistemas 13B+208Pb (242 MeV) e 13N+208Pb (342 MeV) são inéditos e foram recentemente obtidos no Laboratório Lanzhou. Nesse trabalho as distribuições angulares para esses sistemas foram analisadas usando o modelo óptico (OM), método de canais acoplados (CC) e canais acoplados com discretização do contínuo (CDCC) e canais de reações acopladas (CRC). O efeito dos canais acoplados, considerando as excitações do alvo, dos projéteis e incluindo efeitos de reorientação, foi desprezível para os sistemas envolvendo os projéteis 13B, 13C, 13O e 13N. No entanto, para o sistema 13C+208Pb, os acoplamentos dos estados excitados do 13C foram relevantes para a descrição do espalhamento elástico. Realizamos também cálculos de CDCC e a análise mostrou-se importante na descrição do espalhamento elástico para os sistemas 13O+208Pb e 13N+208Pb. A análise da influência das reações de transferência de 1p e 1n também foram realizadas com cálculos de reações acopladas (CRC), indicando uma leve melhora na descrição das distribuições angulares para os sistemas 13B+208Pb e 13C+208Pb. A partir dessas analises, estudamos a influência desses canais de reação na seção de choque elástica e adotando diferentes configurações de cluster para cada sistema podemos descrever as distribuições angulares.
Title in English
Investigation of the elastic scattering of nuclei A = 13 on 208Pb target at intermediate energies
Keywords in English
Coupled channels
Elastic scattering
Nuclear reactions
Radioactive beams
Abstract in English
In this work, we analyze the elastic scattering angular distributions obtained for the 13B+208Pb (Elab = 254 MeV and Elab = 242 MeV), 13O+208Pb (Elab = 414 MeV), 13C+208Pb (Elab = 390 MeV) and 13N+208Pb (Elab = 342 MeV) systems at intermediate energies, around five times above the Coulomb barrier for each system. The data for 13B+208Pb (254 MeV) and 13O+208Pb (414 MeV) systems were obtained at Radioactive Ion Beam Line in Lanzhou (RIBLL) China laboratory with the radioactive 13B and 13O ion beams and have already been published. In the case of the 13C+208Pb (390 MeV) system, the data were also obtained from the literature. The data for the 13B+208Pb (242 MeV) and 13N+208Pb (342 MeV) systems are new, unpublished and were recently obtained also at Radioactive Ion Beam Line in Lanzhou (RIBLL). In this work, the angular distributions for these systems were analyzed using the optical model (OM), coupled channel method (CC), discretized continuum coupled channels (CDCC) and coupled reaction channel (CRC) methods. The effect of the coupled channels, considering the excitations of the target and of the projectiles, as well as reorientation effects, were negligible for the systems involving the 13B, 13C, 13O and 13N projectiles. The analysis with CDCC calculations proved to be important in the description of elastic scattering for the 13O+208Pb and 13N+208Pb systems. The analysis of the influence of 1p and 1n transfer by the coupled reaction calculation (CRC) was also performed, showing a slight improvement in the description of the angular distributions for the 13B+208Pb and 13C+208Pb systems. From these analyses, we study the influence of these reaction channels on the elastic cross section and adopting different cluster configurations for each system we can describe the angular distributions.
 
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.
Publishing Date
2023-03-20
 
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 © 2001-2024. All rights reserved.