Solar Neutrinos
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. New limits for the violation of the equivalence prinriple on solar neutrinos / Novos limites para violação do principio da equivalencia em neutrinos solares
In this work, we studied the model for the violation of the equivalence principle (VEP) on solar and reactor neutrinos. This model was already considered as a promising solution to the solar neutrino problem (SNP), but was abandoned because it wasn?t able to explain all the data with a single set of physical parameters. The mass- avor mixing model, together
Publicado em: 2008
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2. Neutrinos from supernovae / Neutrinos de supernovas
Com este trabalho buscamos entender o fenômeno de oscilações de neutrinos na matéria. Para isto, estudamos a propagação de neutrinos em Supernovas. O estudo é feito nestes objetos astrofísicos, pois são produzidos neutrinos de todos os sabores quando a estrela progenitor da Supernova é muito massiva. Além de isto, estes corpos celestes atingem den
Publicado em: 2008
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3. Constraints on the environment depence of the neutrino mass from solar and reactor neutrino data
We investigate what can be the role of Mass Varying Neutrinos in several different neutrino oscillation experiments, in particular focusing on the relation between KamLAND data and solar neutrino experiment results. Assuming that the adiabaticity of solar neutrinos evolution in LMA-MSW scenario is not broken by the inclusion of this new mechanism, we can est
Brazilian Journal of Physics. Publicado em: 2007-07
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4. Effects of solar neutrinos scale on atmospheric neutrino flux
In this work we try to understand the phenomena of neutrino oscillations, and use this to obtain a more precise description of the atmospheric neutrino data. The two neutrino oscillation mechanism solves the problem of the up-down muon neutrino asymmetry successfully. Our main motivation is to describe the excess of events of electron-neutrino type found in
Brazilian Journal of Physics. Publicado em: 2007-07
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5. Neutrino physics: the roadmap for precision physics
In the last years, we experienced a complete change of the view of weak interaction physics. Robust results from many experiments as Super-Kamiokande, KamLAND, SNO, K2K, show us that the neutrinos have the remarkable phenomena of oscillations, a quantum interference mechanism that operates to distances as large as 100 km and even bigger distances. From this
Brazilian Journal of Physics. Publicado em: 2006-12
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6. Oscilação de neutrinos no formalismo de pacotes de onda / Neutrino oscillation in the wave packet approach
Generally, we study neutrino oscillation phenomenon using the plane wave formalism, which successfully treats the solar neutrino case, the reactor and accelerator cases. However, a more complete description of neutrino oscillation must consider a wave packet approach. This work analyses both formalisms: the plane wave and the wave packet in vacuum and matter
Publicado em: 2006
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7. Compreendendo a oscilação dos neutrinos
Este trabalho é uma introdução ao modelo da oscilação de neutrinos para estudantes de física. Apresentamos o modelo de mistura de neutrinos baseado no conceito de superposição de estados. Em particular, consideraremos o caso onde os neutrinos se propagam exclusivamente no vácuo. A hipótese de mistura entre os sabores de neutrinos leva à oscilaçã
Revista Brasileira de Ensino de Física. Publicado em: 2005-12
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8. Influence of the solar and density perturbations on the neutrino parameters
There are reasons to believe that the solar matter density fluctuates around an equilibrium profile. One of these reasons is a resonance between the Alfvén waves and the g-modes inside the Sun that creates spikes in the density profile. The neutrinos are created in the solar core and passing through these spikes feel them as a noisy perturbation, whose corr
Brazilian Journal of Physics. Publicado em: 2004-12
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9. Introdução a fenomenologia da oscilação de neutrinos, no vacuo e na materia / Introduction to neutrino oscillation s fenomenology, in vacuum and matter
The subject of this work is to produce a didactic text that can be used by physics students as a basis when incoming on the neutrinos phenomenology area. We introduce the neutrinos mixing model in vacuum, based on the concept of state superposition. We show that this hypothesis leads to avor oscillation phenomenon, the one is proposed to be a solution to the
Publicado em: 2004
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10. Introduction to neutrino oscillation s fenomenology, in vacuum and matter / Introdução a fenomenologia da oscilação de neutrinos, no vacuo e na materia
The subject of this work is to produce a didactic text that can be used by physics students as a basis when incoming on the neutrinos phenomenology area. We introduce the neutrinos mixing model in vacuum, based on the concept of state superposition. We show that this hypothesis leads to avor oscillation phenomenon, the one is proposed to be a solution to the
Publicado em: 2004
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11. MHD solar fluctuations and solar neutrinos
We analyze how solar neutrino experiments could detect time fluctuations of the solar neutrino flux due to magnetohydrodynamic (MHD) perturbations of the solar plasma. We state that if such time fluctuations are detected, this would provide a unique signature of the Resonant Spin-Flavor Precession (RSFP) mechanism as a solution to the Solar Neutrino Problem.
Brazilian Journal of Physics. Publicado em: 2003-12
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12. Descoerencia na propagação de neutrinos
In this work we discuss the Neutrino temporal evolution adding the decoherence phenomenon to flavor oscillation. We describe very carefully how the phenomenological decoherence should be added to the evolution and what are the consequences and possibilities that this choice bring to us. Imposing decoherence we found three new dynamics to Neutrino system that
Publicado em: 2003