Neutron Spectra
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Changes in the crystalline degree in neutron irradiated EPDM viewed through infrared spectroscopy and inelastic neutron scattering
ABSTRACT The changes in the degree of crystallinity in commercial Ethylene Propylene Diene rubber-type M (EPDM) irradiated with neutrons at different doses has been studied by means of inelastic neutron scattering and infrared absorption spectroscopy experiments. EPDM samples were taken from the housing of non-ceramic electrical insulators which are used in
Matéria (Rio J.). Publicado em: 19/07/2018
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2. Crescimento e propriedades vibracionais de cristais a base de Ãxidos / Growth and Vibrational Properties of Oxide Crystals
In this work we used different experimental techniques to study four different series of inorganic oxide crystals, namely: (i) congruent lithium isotope niobate (C7LN), (ii) rare-earth doped mixed vanadates ((Nd,Yb):YxGd1-x(VO4)); (iii) alkali metal doped and pure calcium barium niobates (CaxBa1-xNb2O6); and (iv) potassium tantalite niobate (KTa1-xNbxO3). Be
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2012
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3. A comparison between channel selections in heavy ion reactions
The gamma rays de-exciting the yrast and near yrast states in neutron deficient as well as neutron rich nuclei from fusion-evaporation and deep-inelastic reactions and other emission particles have been recorded using an array of escape suppressed germanium detectors, a BGO ball, a recoil separator, silicon charge particle detectors and an ionization chamber
Brazilian Journal of Physics. Publicado em: 2009-03
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4. DEVELOPMENT OF A GAMMA RAY SPECTROMETRY SOFTWARE FOR NEUTRON ACTIVATION ANALYSIS USING THE OPEN SOURCE CONCEP / Desenvolvimento de um software de espectrometria gama para análise por ativação com nêutrons utilizando o conceito de código livre
This study developed a specific software for gamma ray spectra analysis for researchers of the Neutron Activation Laboratory (LAN), which was named SAANI (Instrumental Neutron Activation Analysis Software). The LAN laboratory of the Institute for Research and Nuclear Energy (IPEN-CNEN/SP), uses a multielementar analytical technique, based on irradiation of a
Publicado em: 2008
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5. Desenvolvimento de espectroscopia de plasma induzido por laser para aplicações em análise de patrimônio cultural: estudo de moedas de Um Cruzeiro de 1945 e Mil Réis de 1939 / DEVELOPMENT OF LASER INDUCED BREAKDOWN SPECTROSCOPY OF ONE "CRUZEIRO" FROM 1945 AND THOUSAND "RE¶IS" FROM 1939 FOR APPLICATIONS ON CULTURAL HERITAGE ANALYSIS: STUDY OF COINS
In this work, the technique of laser induced breakdown spectroscopy was developed for application in cultural heritage analysis in order to study coins of one \Cruzeiro" from 1945 and a thousand \R¶eis" from 1939, using a Nd:YAG laser operating in Q-switched mode. It had been determined the best conditions of laser and detection features such as pulse energ
Publicado em: 2008
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6. Microdosimetric studies using a filtered fast neutron irradiation system of research reactor to application in radiation biology / Estudos microdosimétricos usando um sistema de irradiação de nêutrons rápidos filtrados de reator de pesquisa para aplicação de radiobiologia
In this work, microdosimetric measurements were performed using a Wall-less Tissue Equivalent Proportional Counter - TEPC was filled with spherical cavity with an inner diameter of 1.27 cm. The TEPC was tilled with pure propane gas, C3H8 at 5.6 kPa (42 Torr) pressure, which is equi\\alent to 1.3μm in diameter of unit density tissue. The microdosimetric me
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/06/2007
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7. Medida do espectro de energia dos nêutrons no núcleo do Reator IPEN/MB-01 / Measurements of the neutron energy spectra in the core of IPEN/MB-01 reactor
Este trabalho apresenta a medida do espectro de energia dos nêutrons no núcleo do Reator IPEN/MB-01. Para tal, foram inseridos detectores de ativação na forma de diminutas folhas metálicas no núcleo do reator, na região moderadora, utilizando um dispositivo articulado que permite que as folhas fiquem posicionadas na posição central do núcleo do rea
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/11/2006
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8. Desenvolvimento de cristais baseados em iodeto de Césio para aplicação como detectores de radiação / Development of crystals based in cesium iodide for application as radiation detectors
Cintiladores inorgânicos com tempo de decaimento de luminescência rápido, densidade alta e boa produção de luz têm sido objeto de estudos para aplicações em física nuclear, física de energias altas, tomografia nuclear e outros campos da ciência e da engenharia. Cristais de cintilação baseados em iodeto de césio (Csl) são materiais que apresent
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/06/2006
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9. Evaluation of the divergence of a thermal neutron beam using a Position Sensitive Detector
The divergence of the thermal neutron beam available at the main outlet channel of the Argonauta Reactor in the Instituto de Engenharia Nuclear has been measured by using a Position Sensitive Detector. The measurement process addressing a proper beam characterization has been conducted under several geometric arrangements, including attempts to reduce the be
Brazilian Journal of Physics. Publicado em: 2005-09
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10. Investigação da Formação da cor no quartzo de São José da Safira - MG / Investigação da Formação da cor no quartzo de São José da Safira - MG
O presente trabalho tem como objetivo elaborar um modelo que explique as cores obtidas em amostras de quartzo de São José da Safira (MG) após submetê-las a tratamento (irradiação e tratamento térmico). O quartzo natural sem cor é rotineiramente irradiado com raios gama e depois aquecido para adquirir cores que vão desde o verde-oliva até o marromav
Publicado em: 2005
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11. Study of neutron-DNA interaction at the IPEN BNCT research facility
Our group at the Laboratorio do Acelerador Linear (IFUSP- USP) is currently developing several studies related to the interaction of different kinds of radiation with DNA. Initially, our plan is to study the interactions proton-DNA, gamma-DNA and neutron-DNA. In this work we describe the most important features of the neutron-DNA study, which we plan to perf
Brazilian Journal of Physics. Publicado em: 2004-09
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12. SU(3) model description of Be isotopes
Experimental data on light nuclei close to dripline suggests that as the nucleon number asymmetry increases, the shell structure from stability line is not preserved. In contrast with spherical shell model, Elliott's SU(3) model, uses a deformed multi-nucleon basis to describe nuclear states. The SU(3) symmetry is a strong feature of 1p shell nuclei, where s
Brazilian Journal of Physics. Publicado em: 2004-09