ADIMIR DOS SANTOS

ADIMIR DOS SANTOS

(Fonte: Lattes)

ORCID

ScopusID

ResearcherID

Resumo

Possui graduação em Bacharelado Em Física pela Universidade de São Paulo (1975), mestrado em Reatores Nucleares de Potência e Tecnologia do Com pelo Instituto de Pesquisas Energéticas e Nucleares (1978) e doutorado em Nuclear Engineering pela University of Wisconsin – Madison (1984). Atualmente é PESQUISADOR TITULAR III do Instituto de Pesquisas Energéticas e Nucleares, professor titular da Universidade de São Paulo e Revisor de periódico da Progress in Nuclear Energy. Tem experiência na área de Engenharia Nuclear, com ênfase em Tecnologia dos Reatores. Atuando principalmente nos seguintes temas: SENSITIVITY ANALYSIS, TRANSMUTATION, THORIUM, U-233 BREEDING. (Texto extraído do Currículo Lattes em 28 set. 2021)

Página do item completo

Resultados de Busca

Agora exibindo 1 - 2 de 2

The experimental determination of the 238U(n,gamma) and total fission reaction rates along the pellet radius of the IPEN/MB-01 reactor
2017 - MURA, LUIS F.L.; SANTOS, ADIMIR dos; DOMINGOS, DOUGLAS B.; ROSSI, PEDRO C.R.; JEREZ, ROGERIO
This work presents a new experimental approach to determine experimentally the reaction rate along the pellet radius of a research reactor facility. The methodology employs concentric hollow cylindrical lead collimators together with gamma-ray spectrometry in a special kind of HPGe detector for the discrimination of very low gamma energy emitted by Np-239 and Mo-99. The U-238 neutron capture and total fission rates were inferred, respectively, from the 106.2 keV gamma emitted by Np-239 and from the 140.51 keV gamma-ray emitted by Mo-99. These lower gamma-ray energies allow the thickness of the lead collimator to be small enough so that the correction factors applied to the procedure were minimized. This kind somewhat challenging experiment was successfully performed at the IPEN/MB-01 research reactor facility. The experiments are claimed to be well-defined, and they are suitable for a benchmark. The measured values of the total fission rates are mainly due to the thermal fissions in U-235 since in the IPEN/MB-01 reactor nearly 85% of the total fissions occur in the thermal neutron energy region. The theoretical analyses were performed using MCNP-5 together with the ENDF/B-VII.o library. The analyses reveal a very good agreement between the calculated and experimental results for the U-238 epithermal neutron capture reaction rates. However, the same can not be said for the thermal reaction rates which show discrepancies both in magnitude as well as in the shape of the attenuation of the reaction rates inside of the fuel pellet. The suspected reason for these discrepancies is the shape of the U-235 cross sections below 0.3 eV which might be different from that adopted in the ENDF/B-VII.o library. (C) 2016 Elsevier Ltd. All rights reserved.
An experimental validation of Feynman-Alpha Method’s Bunching Technique in the IPEN/MB-01 Nuclear Reator
2017 - ALVES, L.F.M.; ANDRADE, D.A.; SANTOS, A. dos
In this paper we perform an experimental verification of the Bunching Technique proposed by Misawa et al. (1962) to deal with limited time in reactor experiments. This method, widely used in nuclear experiments when the Feynman-Alpha Method is present, permits a significant economy on the measuring time, but lacks broader experimental validation. This issue is addressed in this work. As this work is aimed to those who are already familiar with the Feynman-Alpha Method and its Bunching Technique, only a brief explanation of this method is provided, as the paper focuses on the comparison of experimental and theoretical results. It is also important to stress that the data used was acquired in the IPEN/MB- 01 reactor.