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Master's Dissertation
DOI
10.11606/D.43.2014.tde-26092014-025439
Document
Author
Full name
Erich Leistenschneider
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Lepine, Alinka (President)
Alvarez, Marcos Aurelio Gonzalez
Gomes, Paulo Roberto Silveira
Title in Portuguese
Reações induzidas por protons em 8Li a baixas energias e espectroscopia do 9Be altamente excitado
Keywords in Portuguese
Reações nucleares
Abstract in Portuguese
Reações induzidas por prótons são importantes no estudo do consumo de 8Li em alguns cenários astrofísicos. Neste trabalho, as seções de choque para as reações 8Li(p,p), 8Li(p,α) e 8Li(p,d) foram medidas em cinemática inversa entre Ecm=0.7 e 2.2 MeV. Foi usado um feixe de 8Li de alta pureza selecionado pelo Sistema RIBRAS no Laboratório Pelletron (IF-USP), São Paulo, que colidia com um alvo grosso de polietileno ((CH2)n, 7.7(8) mg/cm2), um plástico rico em prótons. Os produtos de reação foram medidos por um telescópio formado por detectores de barreira de superfície de silício posicionados em um ângulo dianteiro. As funções de excitação medidas foram analisadas através da metodologia de matriz-R e puderam fornecer informações sobre ressonâncias pouco conhecidas do núcleo composto 9Be a altas energias de excitação. A importância de outros canais de decaimento e consequências das reações estudadas na nucleossíntese também são discutidas.
Title in English
Proton-Induced Reactions on 8Li at Low Energies and Spectroscopy of 9Be at High Excitation Energies
Keywords in English
Nuclear reactions
Abstract in English
Proton-induced reactions are important in the study of the destruction of 8Li in some astrophysical scenarios. In this work, the cross sections for the reactions 8Li(p,p), 8Li(p,α) and 8Li(p,d) were measured in inverse kinematics between Ecm = 0.7 and 2.2 MeV. A highly pure 8Li beam selected by RIBRAS System in the Pelletron Laboratory (IF-USP), São Paulo, was used impinging on a thick polyethylene target ((CH2)n , 7.7(8) mg/cm2), a proton-rich plastic. The reaction products were detected by a telescope formed by silicon surfasse barrier detectors placed at a foward angle. The measured excitation functions were analysed through the R-matrix methodology and could provide information about poorly known high-lying resonances of the 9Be compound nucleus. The importance of other decay channels and the consequences of the studied reactions on nucleosynthesis are also discussed.
 
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DissertacaoErich.pdf (16.13 Mbytes)
Publishing Date
2014-10-23
 
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