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Doctoral Thesis
DOI
10.11606/T.43.1994.tde-01102012-143428
Document
Author
Full name
Jose Martins de Oliveira Junior
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1994
Supervisor
Committee
Lepine, Alinka (President)
Canto, Luiz Felipe
Carlson, Brett Vern
Pacheco, Alberto J
Pereira, Dirceu
Title in Portuguese
PROCESSOS BINARIOS MUITO INELASTICO NO CONTEXTO DE CANAIS ACOPLADOS
Keywords in Portuguese
canais quase-elásticos
Abstract in Portuguese
Foram medidas distribuições angulares dos canais quase-elásticos e do decaimento em fragmentos binários fortemente amortecidos dos sistemas ANTPOT. 18 O+ANTPOT. 10,11 B E ANTPOT. 28 Si + ANTPOT. 16 O em energias de E IND. LAB(ANTPOT. 18 0) = 52,5 MeV e E IND. LAB(ANTPOT. 28 0) = 107,5 e 139 MeV. Em todos os sistemas, as distribuições angulares quase-elásticas apresentam oscilações com uma subida da seção de choque em ângulos traseiros. As distribuições integradas em valor de Q, apresentam o comportamento 1/sen IND. CM em todos os sistemas indicando uma vida-média longa. Medidas de distribuição de massa de fragmentos emitidos e razão (ANTPOT. 16 O/ANTPOT. 12 C) sugerem que o mecanismo de reação no caso do sistema ANTPOT. 28 Si + ANTPOT. 16 O é de orbiting, não passando pela formação do núcleo composto. Cálculos de canais acoplados, incluindo grande número de canais populados nas reações, permitem reproduzir as distribuições angulares oscilantes e com forte subida em ângulos traseiros dos estados individuais, bem como as distribuições angulares integradas em Q, lisas, com comportamento 1/sen IND. CM para os sistemas ANTPOT. 18 O+ANTPOT. 10,11 B E ANTPOT. 28 Si + ANTPOT. 16 O.
Title in English
Binary Process Very Inelastic in the Context of Coupled Channels.
Keywords in English
quasielastic reactions
Abstract in English
The binary decay into strongly damped fragments and the quasielastic reactions of the systems 18O + 10,11B and 28Si + 16O were measured at ELAB(18O)=52.5 MeV, ELAB(28O)=107.5 e 139 MeV in the angular range of 30ºCM160º. In bolh systems the quasielastic angular distributions present oscillations and strong increase in the backward region. The angular distributions of the Q-value integrated cross-section follow the tendency 1/sinCM in both systems indicating a long life-time. Mass distribution measurement and the (16O/12C) ration suggest that the reaction mechanism in the case of the 28Si+16O system is orbiting/deep-inelastic. Coupled channels calculations, including a great number of the channels populated in the reactions yield angular distributions which agree well with experimental data for both systems.
 
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45886JrOliveira.pdf (4.53 Mbytes)
Publishing Date
2012-10-01
 
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