Introdução a fenomenologia da oscilação de neutrinos, no vacuo e na materia / Introduction to neutrino oscillation s fenomenology, in vacuum and matter

AUTOR(ES)

Gustavo do Amaral Valdiviesso

DATA DE PUBLICAÇÃO

2004

RESUMO

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 solar neutrino problem. We show that vacuum oscillations between the Sun and the Earth cannot explain the experimental data, making necessary the inclusion of solar matter effects. The solar medium leads to modifications on the predictions because of resonance effects. The set of phenomenon that takes place due to the presence and to the distribution of solar medium, called MSW effect, leads to the real solution of the solar neutrino problem. We make a simple fit on the models parameters, finding the best fit to de SuperKamiokande data set. With the model fitted, we show that it agrees with Homestake data

ASSUNTO(S)

efeito msw solar neutrinos fisica - estudo e ensino oscilação de neutrinos neutrino oscillation mistura de sabor neutrinos solares physics flavor mixing msw effect

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