Cosmic Physics
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Mecanismos de limitação da energia de raios cósmicos durante sua propagação
Resumo A cada segundo que passa, um número muito grande de partículas de origem cósmica atravessam o planeta. A maior parte delas pouco interage com a matéria e sua passagem não é percebida, exceto pelos pesquisadores da física de partículas. Os raios cósmicos são um tipo destas partículas, de origem extraterrestre, que podem ser estudados com aux
Rev. Bras. Ensino Fís.. Publicado em: 01/07/2019
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2. Estudo sobre a identificação de hádrons em câmaras de fotoemulsão / Study about hadron identification in emulsion chambers
This work introduces the importance of photoemulsion chambers that remain in use after decades and still offer many advantages for elementary particle physics. We cite OPERA (Oscillation Project with Emulsion-tRacking Apparatus) detector that is the greatest lead photoemulsion chamber detector ever constructed as an example of its application nowadays (nine
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/04/2012
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3. Um modelo híbrido para a poeira cometária
In this Work, we present a systematic and uniform study involving the productivity of Comet 67P/Churyumov-Gerasimenko, target of ROSETTA Mission, during the 1982, 1996, and 2002 apparitions. Gas mass production rates [in g s-1] are obtained using hydroxyl radical (OH) rates [in molecules s-1], given in literature, considering that ~ 85% of the water photodis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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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. Forward Physics at the LHC: within and beyond the Standard Model
We review the detection capabilities in the forward direction of the various LHC experiments together with the associated physics programme. A selection of measurements accessible with near-beam instrumentation in various sectors (and extensions) of the Standard Model (SM) is outlined, including QCD (diffractive and elastic scattering, low-x parton dynamics,
Brazilian Journal of Physics. Publicado em: 2008-09
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6. Quark matter (strangelets) from astrophysical sources and its detection by terrestrial experiments. / Matéria de quarks (strangelets) de origem astrofísica e sua detecção por experimentos terrestres
The strange quark matter hypothesis, which states that a plasma composed of quarks up, down and strange in roughly equal amounts is absolutely stable at zero pressure, has been studied for more than twenty years, both theoretically and during searches for its detection in specific experiments. If strange quark matter is indeed stable, then there could be imp
Publicado em: 2008
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7. Cosmologia na teoria de Visser / Cosmology from the Visser s theory
The advent of observational cosmology has led us to conclude that only 4% of whole Universe is composed by known matter (baryons). On the other hand 23% comes from a kind of non barionic dark matter. Moreover the cosmic dynamics is almost fully dominated by the so called dark energy (usually considered a kind of fluid), which corresponds to 73% of the energy
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/08/2006
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8. First results from the Pierre Auger Observatory
We review in these notes the status of the construction of the Pierre Auger Observatory and present the first Physics results, based on the data collected during the first year and a half of operation. These results are preliminary, once the work to understand the systematics of the detectors are still underway. We discuss the cosmic ray spectrum above 3 EeV
Brazilian Journal of Physics. Publicado em: 2006-12
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9. The shape of space after WMAP data
What is the shape of space is a long-standing question in cosmology. I review recent advances in cosmic topology since it has entered a new era of experimental tests. High redshift surveys of astronomical sources and accurate maps of the Cosmic Microwave Background radiation (CMB) are beginning to hint at the shape of the universe, or at least to limit the w
Brazilian Journal of Physics. Publicado em: 2006-03
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10. Cosmologia na teoria de Visser / Cosmology from the Visser s theory
The advent of observational cosmology has led us to conclude that only 4% of whole Universe is composed by known matter (baryons). On the other hand 23% comes from a kind of non barionic dark matter. Moreover the cosmic dynamics is almost fully dominated by the so called dark energy (usually considered a kind of fluid), which corresponds to 73% of the energy
Publicado em: 2006
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11. Propriedades microscopicas e macroscopicas de superficie em ligas ferrosas implantadas com nitrogenio
The understanding of cosmic radiation -the production/ acceleration mechanism and the propagation processes -involves the determination of three parameters: the energy of this radiation, its arrival direction and the chemical composition. These three tasks have challenged the experience, the skill and responsibility of several groups of particle physicists o
Publicado em: 2004
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12. Perfil longitudinal de CAE s : flutuações, simulação híbrida e a dependência de modelos de interações hadrônicas
The goal of this thesis is present a fast one dimensional hybrid method by Monte Carlo scheme to efficiently simulate the longitudinal development of extensive air showers up to the highest observed energies (>10 18eV). Based on precalculated pion showers and a bootstrap technique, the method predicts the average shower profile, the number of muons at detect
Publicado em: 2002