1 High Energy Physics
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Aplicabilidade e validação do Geant4 para fótons e elétrons em radioterapia / GEANT4 applicability and validation to Photons and Electrons in Radiotherapy
Due to the increasing use of ionizing radiation in medical applications, in recent decades, the simulation codes for radiation interacting with matter, based on Monte Carlo Method, have been constantly adapted to applications in medical physics. TheMonte Carlo method is a statisticalmethod of numerical simulation of problems using essentially a sequence of r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/06/2011
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2. Aplicação das regras de soma da QCD no estudo de possíveis estados moleculares / Aplication of the QCD sum roles in the studies of possible molecular states
Usando as Regras de Soma da QCD, testamos se a nova estrutura estreita, X(4350) recentemente observada pela Colaboração Belle, pode ser descrita como um estado molecular DsDs0 exótico JPC = 1+. Consideramos as contribuições dos condensados de dimensão oito, trabalhamos com os termos dominantes em s mantendo os termos lineares na massa do quark estranho
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2011
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3. On the inverse problem in high-energy elastic hadron scattering and the applicability of a representation for the real part of the amplitude / Um estudo sobre o problema inverso do espalhamento elastico de hadrons em altas energias e a aplicabilidade de uma representacao para a parte real da amplitude
The theoretical description of high-energy elastic hadron scattering constitutes an open problem in both, the underlying quantum field theory of strong interactions (QCD) and the phenomenological context. In this work the inverse problem in elastic hadron scattering is discussed in the impact parameter and eikonal frameworks, specifically a study on the empi
Publicado em: 2010
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4. Estudo da propagação dos raios cósmicos de ultra-alta energia em campos magnéticos extragalácticos / Studying the propagation of cosmic rays of ultra-high-energy extragalactic magnetic fields
Raios Cósmicos de Ultra-Alta Energia (RCUAEs) são partículas de origem cósmica com energia acima de 1 EeV, consistindo principalmente de prótons e núcleos pesados que viajam através do universo e incidem constantemente na atmosfera terrestre. Vários modelos têm sido propostos para explicar as fontes de tais partículas, e por isso, o estudo dos raio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2009
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5. Study of nuclear reactions of astrophysics interest through the trojan horse method / Estudo de reações nucleares de interesse astrofísico utilizando o método do cavalo de tróia
Nuclear Astrophysics is the key to explain, among other things, the production of energy in stars, stellar evolution and the synthesis of chemical elements and isotopes in the Universe. In such cases, nuclear reactions are the main structure, where cross sections and reaction rates must be determined with reasonable accuracy in the laboratory. Because the ex
Publicado em: 2009
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6. Purificação de silicio metalurgico por fusão zonal horizontal em forno de feixe de eletrons / Purification of metallurgical silicon by horizontal zone melting in an electron beam furnace
The search for renewable energy sources has caused a boom in the production of solar cells in this decade, which rose from 0.3 GW in 2002 to 6.0 GW in 2008, totaling 37 billion dollars in 2008. The production of Electronic Grade Silicon (SiGE) increased 127% from 2007 to 2008, and approximately 90% of solar cells produced nowadays use SiGE, which is responsi
Publicado em: 2009
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7. Influence of vinasse application in saturated hydraulic conductivity and runoff / Influência da aplicação de vinhaça na condutividade hidráulica do solo saturado e no escoamento superficial
The production of alcohol used as fuel is increasing every year due to the need to replace the sources of fossil fuels, which is finite, and on the other hand alcohol is a renewable energy source. But the production of this fuel generates large quantities of waste and the vinasse draws most attention by its high value as fertilizer, primarily by the amount o
Publicado em: 2009
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8. ANÁLISE DE AMPLITUDES DO DECAIMENTO D+ KS(PI)-(PI)+(PI)+ NO EXPERIMENTO FOCUS / AMPLITUDE ANALYSIS OF THE DECAY D+ K (PI)-(PI)+(PI)+ IN FOCUS EXPERIMENT
This thesis is devoted to the study of the decay D+ KS(pi)− (pi)+(pi)+ with data collected from the FOCUS experiment, at Fermilab. The final state composed of 4 pseudo-scalars can be produced through a number of resonant sub-structures. The purpose of this analysis is to find the contributing intermediate states by measuring their relative strenghts an
Publicado em: 2007
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9. Reaction Mechanisms on the 16,18O + 63,65Cu Systems / Mecanismos de Reação nos Sistemas 16,18O + 63,65Cu
The quasi-elastic excitation functions for the systems 16,18O + 63,65Cu have been measured, at the angle 161º and at energies between 30 and 48MeV, in the laboratory reference system. The quasi-elastic term refers to the sum of the elastic scattering, the inelastic scattering and the transfer reactions. Care has been taken in order to obtain high precision
Publicado em: 2007
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10. Propriedades Magneto-Ópticas do Pb(x)Eu(1-X)Te COM 0 ≤ x ≤ 0.2 / MAGNETO-OPTICAL PROPERTIES OF Pb(x)Eu(1-X)Te WITH 0 ≤ x ≤ 0.2
The optical properties of epitaxial samples of PbxEu1-xTe with 0 ≤ x ≤ 0.2 have been investigated by photoluminescence measurements at various temperatures and magnetic fields and through transmittance and reflectance measurements at room temperature. The samples were grown by molecular beam epitaxy in a Riber 32p MBE system at LAS-INPE o
Publicado em: 2007
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11. O líquido de spin isolante no modelo de Hubbard bidimensional levemente dopado
Our main goal here is to analyze the low-energy properties of the two-dimensional (2d) Hubbard model slightly away from half-lling from a renormalization group point of view within the two-loop approximation. We will develop this technique adapting it conveniently to our problem at hand. As a warm-up test for our approach, we will apply the same methodology
Publicado em: 2006
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12. Spallation physics and the ADS target design
This paper reviews the physics of the spallation which is a nuclear reaction in which a particle (e.g. proton) interacts with a nucleus. Given to the high energy of the incident proton, in a first stage it interacts with the individual nucleons in an intranuclear cascade which leads to the emission of secondary particles (neutrons, protons, mesons, etc.). In
Brazilian Journal of Physics. Publicado em: 2005-09