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Master's Dissertation
DOI
10.11606/D.43.1977.tde-11052015-172553
Document
Author
Full name
Kiyomi Koide
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1977
Supervisor
Title in Portuguese
UM ESTUDO DAS REACOES 10B(14N,p)23 Na E 10B(14N, )20 Ne NA REGIAO SUBCOULOMBIANA
Keywords in Portuguese
Reações nucleares; Fusão nuclear
Abstract in Portuguese
Funções de excitação para a reação 10B(14N,p)23Na a ? Lab = 165° e para a reação 10B(14N, ?)20Ne a ? Lab 4° no intervalo de energia de bombardeio de 9,5 MeV a 13 MeV foram investigadas. Em ambas as reações não se encontrou evidência, para vários grupos de partículas observadas, da forte ressonância observada na interação 12C + 12C (correspondente à excitação do estado 12+ a 33,2 MeV no 24Mg). A análise da interação 10B + 14N pelo modelo ótico mostrou que o momento angular disponível não é suficiente para popular o estado 12+ do 14Mg. As duas reações foram estudadas com base na teoria estatística de reações nucleares. As ambiguidades nos parâmetros envolvidos foram discutidas. O bom acordo obtido entre a seção de choque experimental e a seção de choque calculada pelo modelo Hauser-Feshbach indica que o processo dominante é o de núcleo composto.
Title in English
A study of the reactions 10B(14N,p)23Na and 10B(14N, ?)20Ne in subcoulombiana region
Keywords in English
Nuclear reactions; Nuclear fusion
Abstract in English
The excitation functions of reactions 10B(14N,p)23Na and 10B(14N, ?)20Ne were measured at ? Lab = 4° and 165° respectively, varying the incident energy between 9,5 and 13 MeV. There is no evidence, in both reactions, of the resonance observed at ECM = 19,3 MeV in the 12C + 12C interaction (corresponding to the excitation of the 12+ state at 33,2 MeV in 24Mg). Optical model analysis of 10B + 14N interaction shows that the angular momentum of the entrance channel is too low to populate this 12+ state of 24Mg. Predictious of the statistical theory of nuclear reactions are compared with experimental reaction cross sections. The ambiguities in optical model and level density parameters are discussed. Good agreement between experimental and calculated cross sections indicates that the dominant mechanism in these reactions is the compound-nucleus process.
 
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Publishing Date
2015-05-13
 
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