Abstract:The population and the mode of decay of the low-lying excited levels of 193 Ir have been investigated by single and γγ coincidence spectroscopy using 192 Os enriched to 99% and several HPGe detectors. From singles spectra analysis the energies of 71 gamma rays have been determined with a better overall precision than previously, 17 of them for the first time. The energies at 1043.244(15) and 1316.628(18)keV , observed for the first time in this work, as well as some preliminary coincidence relationships, sugge… Show more
“…Most of the γ-ray intensities were taken from a previous singles spectroscopy experiment [10,11]; in the cases where the spectroscopy results didn't agree (within 2σ) with the reference values from [1], when the transition hadn't been seen in the spectroscopy experiment, and also for every new transition, I(γ) was calculated from γ − γ coincidence analysis by assuming that ∑ AB,AC...CD W (θ) k, where k is constant for all transitions, regardless of their multipolarity and mixing ratio; this would be true if the detectors covered 4π -in the present case, the assumption was tested on several well-established transitions, and the values obtained were in excellent agreement with the expected ones. This way, if two gamma transitions γ 1 and γ 2 are in direct coincidence with a third one γ 3 (i.e., there are no intermediate transitions between γ 1 and γ 3 or between γ 2 and γ 3 ); then: where A(i j) is the area of the coincidence photopeak for the pair γ i × γ j and ε(i j) is the sum of the detection efficiencies of all six detector pairs for the cascade.…”
The excited states in 193 Ir populated by the β − decay of 193 Os were investigated via γ-γ coincidence analysis. Three levels at 517, 563 and 621 keV, previsouly seen only in nuclear reaction studies, were observed in the present measurements; the 487 keV transition from the 849 keV level was identified, providing good evidence that the levels at 848.93 and 849.083 keV are the same. The level at 807 keV was positively identified through both the 449 and 668 keV transitions; also, there is evidence for four new levels at 880, 882, 890 and 986 keV, and several newly-found γ transitions were identified and placed in the decay scheme.
“…Most of the γ-ray intensities were taken from a previous singles spectroscopy experiment [10,11]; in the cases where the spectroscopy results didn't agree (within 2σ) with the reference values from [1], when the transition hadn't been seen in the spectroscopy experiment, and also for every new transition, I(γ) was calculated from γ − γ coincidence analysis by assuming that ∑ AB,AC...CD W (θ) k, where k is constant for all transitions, regardless of their multipolarity and mixing ratio; this would be true if the detectors covered 4π -in the present case, the assumption was tested on several well-established transitions, and the values obtained were in excellent agreement with the expected ones. This way, if two gamma transitions γ 1 and γ 2 are in direct coincidence with a third one γ 3 (i.e., there are no intermediate transitions between γ 1 and γ 3 or between γ 2 and γ 3 ); then: where A(i j) is the area of the coincidence photopeak for the pair γ i × γ j and ε(i j) is the sum of the detection efficiencies of all six detector pairs for the cascade.…”
The excited states in 193 Ir populated by the β − decay of 193 Os were investigated via γ-γ coincidence analysis. Three levels at 517, 563 and 621 keV, previsouly seen only in nuclear reaction studies, were observed in the present measurements; the 487 keV transition from the 849 keV level was identified, providing good evidence that the levels at 848.93 and 849.083 keV are the same. The level at 807 keV was positively identified through both the 449 and 668 keV transitions; also, there is evidence for four new levels at 880, 882, 890 and 986 keV, and several newly-found γ transitions were identified and placed in the decay scheme.
“…análise de elementos traços em cabelo [29] e análise de amostras de sangue [18,31,32,33,34,35,36,37,38,39,40,41,42,43]; investigação de parâmetros nucleares [44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61].…”
Section: Avaliação Estrutural Da Placa Matriz Do Núcleo Do Reatorunclassified
Expresso meu sincero reconhecimento a todos que, direta ou indiretamente contribuíram com a elaboração deste presente trabalho, incluindo aqueles que porventura, não estejam aqui relacionados e especialmente: Ao Instituto de Pesquisas Energéticas e Nucleares e à Comissão Nacional de Energia Nuclear pela oportunidade de execução deste trabalho e pela minha formação profissional, apoio científico e tecnológico ao projeto de pesquisa. Ao Dr. Tufic Madi Filho, pela inestimável e valiosa orientação durante toda as etapas do trabalho. Sem a motivação e o incentivo deste admirável profissional e amigo, este trabalho não teria sido iniciado. Ao M.Sc Walter Ricci Filho, da gerência do CRO do IPEN, pelo incentivo e oportunidade, pela infra-estrutura necessária ao desenvolvimento deste trabalho e amizade. À M.Sc Fernanda Bernardes Calvo pelo apoio sempre atuante, pela amizade e encorajamento durante o tempo de preparação deste trabalho. Aos Colegas do Centro de Operação do Reator IEA-R1 (CRO) do IPEN pelo apoio e incentivo e especialmente ao Sr. Gilson de Freitas Maciel pela parceria no desenvolvimento e implementação da automação do sistema. A todos os colegas do Departamento de Projeto e Fabricação (DPF) do IPEN, que contribuíram no desenvolvimento deste trabalho na elaboração e confecção dos dispositivos mecânicos. Em especial o Mcs Fabio Eduardo Campo, Sr. Sergio Augusto Sá, Sr. Sergio Antonio do Prado, Sr. José Carlos Sabino e sua equipe de Usinagem, Sr. Idacir Mantovani e sua equipe de Montagem. À Equipe de Proteção Radiológica no CRO pelo empenho e monitorações constantes do sistema. Aos Colegas dos Laboratórios LAN (de Análises por Ativação), LMN (de Metrologia Nuclear) e LEER (de Espectroscopia e Espectrometria das Radiações) do IPEN pela colaboração, como usuários, nas análises necessárias e elaboração dos resultados utilizados na validação do trabalho. iii " A mente que se abre a uma nova idéia, jamais volta ao seu tamanho original "
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