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Doctoral Thesis
DOI
10.11606/T.43.1994.tde-25102012-152459
Document
Author
Full name
Marcia de Almeida Rizzutto
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1994
Supervisor
Committee
Cybulska, Ewa Wanda (President)
Canto, Luiz Felipe
Gomes, Paulo Roberto Silveira
Helene, Otaviano Augusto Marcondes
Lima, Celso Luiz
Title in Portuguese
Núcleos transicionais na região de A=130
Keywords in Portuguese
138 Pr
Alto spin.
Coincidência y-y-t
Distribuição angular
Espectroscopia y
Função de excitação
Modelo de \"Cranking\"
Reações de fusão evaporação
\"Projected Shell Model\"
Abstract in Portuguese
Com o objetivo de ampliar o conhecimento da estrutura dos núcleos duplamente ímpares da região de massa A = 130- 140, foram medidos os estados de spin elevado do ANTIPOT. 138 Pr, que se aproxima da camada fechada N = 82, através de técnicas de espectroscopia y em linha utilizando a reação ANTPOT. 128 Te (ANTIPOT. 14 N,4ny). Pela primeira vez, três bandas rotacionais foram observadas neste núcleo. Uma análise teórica da sistemática desta região foi feita com base nos modelos de "Cranking Shell Model" e "Projected Shell Model". De um modo geral, uma boa concordância foi obtida entre os resultados experimentais e teóricos. O primeiro modelo indica a coexistência de formas no ANTIPOT. 138 Pr (N=79}, enquanto o segundo sugere forma unicamente oblata. Por outro lado, os dois modelos prevêm uma transição de forma de prolato (N = 73) para oblato (N = 79) passando por uma região de triaxialidade em torno de N = 77.
Title in English
Transitional Nuclei in the region of A = 130
Keywords in English
138 Pr
angular distribution
Evaporation fusion Reactions
excitation function
model \"Cranking\"
Y Spectroscopy
Y-Y-T coincidence
\" High spin.
\"Projected Shell Model
Abstract in English
With the view of extending the systematics of the odd-odd, A = 130 - 140 mass region nuclei towards the N =82 closed shell, high spin states in 138Pr nucleus have been investigated with the 128 Te(l4N,4n7) reaction, using on-line 7-ray spectroscopy techniques. For the first time three rotational bands were observed in this nucleus. A theoretical analysis of the mass region A = 130 - 140 was carried out with the Cranking Shell Model and the Projected Shell Model. Generally speaking, a good agreement was obtained between the experimental and the theoretical results. The first model indicates a shape coexistence in the 138 Pr (N =79) nucleus, while the second one shows an oblate shape. On the other hand, both models suggest a shape transition from prolate (N=73) to oblate (N=79) passing through a triaxial region around N=77.
 
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45968Rizzutto.pdf (885.08 Kbytes)
Publishing Date
2012-10-25
 
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