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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.1983.tde-10042015-150708
Document
Author
Full name
Nelson Carlin Filho
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1983
Supervisor
Title in Portuguese
Determinação de Parâmetros de Densidade de Níveis para Núcleos na Camada s-p
Keywords in Portuguese
Reações nucleares com íons pesados
Abstract in Portuguese
Através do estudo do contínuo de espectros de partículas leves evaporadas por um núcleo composto, determinamos parâmetros de densidade de níveis para núcleos pertencentes à camada s-d. Foram medidas distribuições angulares para os sistemas 16O + 12C (48. 8 e 54.2 MeV), 14N + 12C (46.0 MeV) e 18O + 12C (41.3 MeV), com 5° <= ?LAB <= 80°, obtendo-se espectros referentes aos canais de saída p, d, t e ?. Telescópios do tipo barreira de superfície foram utilizados na deteção das partículas carregadas. A análise foi efetuada em base ao modelo estatístico de Hauser-Feshbach onde o conhecimento da densidade de níveis dos núcleos residuais e, particularmente do parâmetro de densidade de níveis, é fundamental. A restrição do estudo a regiões de energia de excitação onde predomina a contribuição do primeiro decaimento do núcleo composto, permitiu eliminar a ambiguidade dos resultados As vantagens e inconvenientes do método aplicado são discutidos
Title in English
Determining levels density parameter for s-d nuclei
Keywords in English
Nuclear reactions with heavy ions
Abstract in English
Level density parameters for s-d nuclei were obtained through the study of the continuum of light particles evaporation spectra, from heavy ion compound reactions, Angular distributions were measured for the 16O + 12C (48. 8 e 54.2 MeV), 14N + 12C (46.0 MeV) and 18O + 12C (41.3 MeV) systems in the .angular interval 5° <= ?LAB <= 80°. Energy spectra of the p, d., t and ? exit channels were obtained. Solid state telescopes were used for the charged particles identification. The analysis of the data has been performed within the framework of the Hauser-Feshbach theory. The importance of the level density parameter has been investigated. The comparison of the experimental data to the theoretical prediction has been done in an excitation energy region in which sequential decay is negligible. The accuracy of the method is discussed.
 
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Carlin_Filho_1983.pdf (5.72 Mbytes)
Publishing Date
2015-04-30
 
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