Determination of k0 and Q0 for 113In(n,gamma)114In reaction with covariance analysis
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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The use of k0 method for quantitative reactor Neutron Activation Analysis (NAA)
is a well-known technique for determining multi-element concentrations in different
materials. In order to achieve good results, there is a continuing need for improving
the accuracy of k0 and Q0 parameters for several neutron capture reactions.
113In(n,
)114In reaction can be considered particularly interesting because k0 and Q0
discrepancies appear in the literature. This fact motivated the present work which is
focused on the measurement of k0 and Q0 values for this reaction with the purpose
of improving the existing data catalogues. The irradiations were performed near the
core of the IEA-R1 4.5 MW swimming-pool nuclear research reactor of the Nuclear
and Energy Research Institute (IPEN-CNEN/SP), in São Paulo, Brazil. The distribution
of epithermal neutron flux in the IEA-R1 is close to zero at the chosen
irradiation position, which favors to obtain Q0 accurately. Two irradiations were
carried out in sequence using two sets of samples: the first with a cadmium cover
around the samples and the second without. The activity measurements were carried
out in an HPGe gamma-ray spectrometer. Standard sources of 152Eu, 133Ba, 60Co
and 137Cs supplied by the IAEA were used in order to obtain the HPGe gamma-ray
peak efficiency as a function of the energy. The covariance matrix methodology was
applied to all uncertainties involved. The final values for k0 and Q0 were compared
with the literature.
Como referenciar
BARROS, L.F.; DIAS, M.S.; KOSKINAS, M.F.; YAMAZAKI, I.M.; SEMMLER, R.; RIBEIRO, R.V. Determination of k0 and Q0 for 113In(n,gamma)114In reaction with covariance analysis. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 35-35. Disponível em: http://repositorio.ipen.br/handle/123456789/28731. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.