Estudo de bandas rotacionais nos núcleos ímpar-ímpar 132,134La

Oliveira, Jose Roberto Brandao de

doi:10.11606/T.43.1989.tde-09122013-142416

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Doctoral Thesis

DOI

https://doi.org/10.11606/T.43.1989.tde-09122013-142416

Document

Doctoral Thesis

Author

Oliveira, Jose Roberto Brandao de (Catálogo USP)

Full name

Jose Roberto Brandao de Oliveira

Institute/School/College

Instituto de Física

Knowledge Area

Nuclear Physics

Date of Defense

1989-12-19

Published

São Paulo, 1989

Supervisor

Cybulska, Ewa Wanda (Catálogo USP)

Committee

Cybulska, Ewa Wanda (President)
Helene, Otaviano Augusto Marcondes
Lima, Celso Luiz
Saxena, Rajendra Narain
Sharma, Shelley

Title in Portuguese

Estudo de bandas rotacionais nos núcleos ímpar-ímpar 132,134La

Keywords in Portuguese

Alto spin
Distribuição angular
Espectroscopia gama
Física nuclear
Função de excitação
Modelo de camadas
Reações fusão-evaporação

Abstract in Portuguese

Os núcleos, ímpar-ímpar ANTPOT. 132,134 La foram estudados através de técnicas de espectroscopia em linha de reações tipo (HI, xn). Foram usados feixes de ANTPOT. 10,11 B(40-48 MeV) e ANTPOT. 14 N (55 MeV) em alvos de ANTPOT. 128,128 Te e ANTPOT. 122 Sn no acelerador Pelletron. Foi observada uma banda rotacional, presumidamente sobre a configuração h IND. 11/2 e h IND. 11/2 em cada um dos isótopos, mostrando valores de "signature splitting" moderados. No ANTPOT. 132 La uma outra banda foi observada essencialmente sem "signature splitting". Os resultados são comparados com as previsões do "Cranking Shell Model" triaxial. A relação entre triaxialidade e "signature splitting" na região de transição A ~ 130 é discutida.

Title in English

Study of rotational bands in odd-odd nuclei 132,134La

Keywords in English

Angular distribution
Excitation function
Fusion-evaporation reactions
Gamma spectroscopy
High spin
Model layers
Nuclear physics

Abstract in English

The odd-odd nuclei 132,134La were studied by means of in-beam -ray spectroscopy techniques, using (HI, xn) reactions with 10,11B (40-48 MeV), 14N (55 MeV) beams on 128,128Te and 122 Sn targets. A band, probably based on the h11/2 and h11/2 configuration, was observed in each La isotope showing moderate signature splitting. Another band was observed in 132La with essentially no signature splitting. The results are compared with the triaxial Cranking Shell Model predictions. The relation between triaxiality and signature splitting in the A ~ 130 transitional mass region is discussed.

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Publishing Date

2014-02-21

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