Neutrino Decay
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. La invención del neutrino: un análisis epistemológico
By 1930 the explanation of Beta radioactive decay produced a crisis in the domain of particle physics. Conservation of energy, momentum and quantum statistics seemed to be challenged. Pauli succeeded in solving all these anomalies by postulating the existence of neutrinos inside atomic nuclei. But he did it at the cost of assuming a model of the nucleus that
Scientiae Studia. Publicado em: 2012
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2. Fenomenologia dos decaimentos de neutrinos de supernova / Decay phenomenology of supernova neutrinos
Here we present a study of the phenomenology of neutrinos, which starts with a model beyond the Standard Model, which generates mass and decay to neutrinos. The model was proposed by Gelmini and Roncadelli cite Gelmini: 1981, the model needs a triplet that interacts with the scaling doublet Higgs through different potential climb. The triplet also interacts
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2011
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3. Neutrinos astrofísicos : mecanismo de produção e razão entre sabores / Astrophysical neutrinos : production mechanism and flavor radio
Neutrinos Astrofísicos são produzidos quando prótons ou núcleos, acelerados numa fonte astrofísica, interagem com a matéria nas imediações gerando méons que decaem fracamente produzindo neutrinos. Remanescentes de Supernovas, Núcleos Ativos de Galáxias (AGN) e Explosões de Raios Gama (GRB) são alguns dos candidatos a fontes, e a detecção desse
Publicado em: 2011
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4. Study of the Neutrinos Angra Project detector s energy resolution for measurement of the nuclear fuel composition / Estudo da resolução em energia do detector de neutrinos do Projeto ANGRA para mediadas de composição do combustivel nuclear
Nuclear reactors are an abundant source of anti-neutrinos, whose spectrum is determined by the hera decay of radioactive isotopes in the nuclear fuel. As the fuel is consumed, their isotopic composition is altered, with direct consequences on the spectrum of anti-neutrlnos. Thus, detection of anti-neutrinos can be applied in monitoring the isotopic compositi
Publicado em: 2009
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5. New analyses of double-bang events in the atmosphere
We use CORSIKA+Herwig simulation code to produce ultra-high energy neutrino interactions in the atmosphere. Our aim is to reproduce extensive air showers originated by extragalactic tau-neutrinos. For charged current tau-neutrino interactions in the atmosphere, beside the air shower originated from the neutrino interaction, it is expected that a tau is creat
Brazilian Journal of Physics. Publicado em: 2008-06
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6. STUDY OF THE EFFECTS OF STERILE NEUTRINOS IN BETA DECAY EXPERIMENTS / ESTUDO DOS EFEITOS DE NEUTRINOS ESTÉREIS EM EXPERIMENTOS DE DECAIMENTO BETA
Nesta dissertação, estudamos do ponto de vista fenomenológico, os efeitos de neutrinos estéreis para os observáveis de massas de neutrinos baseado nos dados do experimento LSND e nos resultados divulgados recentemente pela colaboração MiniBooNE. Consideramos observáveis de massa as seguintes quantidades: o parâmetro de massa cinemática cuja medida
Publicado em: 2008
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7. Neutrino signals from galactic binaries
We analyze the possible origin of high-energy neutrinos coming from galactic sources. A model is proposed for neutrino hadroproduction in binary systems. Our results show that neutrino observatories like IceCube can establish whether TeV neutrinos and gamma rays emitted by microquasars are the decay products of pions. Such pions can be produced where the jet
Brazilian Journal of Physics. Publicado em: 2007-07
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8. Decaimentos de neutrinos induzidos por escalares e aplicações a supernovas / Neutrinos decays via scalars and their applications to supernovas
In this work we study nonradiative decays of Majorona neutrinos, via massless bosons, in vacuum and matter. The considerate couplings between the neutrinos and the bosons were scalar and pseudoscalar. In particular we study the processes n i ® nj + c e n i ® n j + c (where is either scalar or pseudoscalar field). In vacuum, we calculate effective rates in
Publicado em: 2006
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9. A formalism for weak interactions in nuclei
The neutrino-nucleus cross-section and the muon capture rate are discussed within a simple formalism which facilitates the nuclear structure calculations. The corresponding formulae only depend on four types of nuclear matrix elements, which are currently used in the nuclear beta decay. We have also considered the non-locality effects arising from the veloci
Brazilian Journal of Physics. Publicado em: 2004-09
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10. Estudo fenomenológico dos neutrinos em experimentos que utilizam fontes terrestres / Phenomenological study of neutrino experiments that use land-based sources
Nesta tese, realizamos dois tipos de estudos fenomenológicos através de uma análise detalhada de alguns experimentos terrestres atuais e futuros. No primeiro, estudamos dois mecanismos exóticos de conversão de sabor: descoerência quântica e interações não padrão do neutrino com a matéria. Para descoerência, vinculamos o parâmetro de descoerênc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2003
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11. Neutrino mass, proton decay, and neutron oscillations as crucial tests of unification models (A Review)
Several crucial tests of three popular unification models (of strong, electromagnetic, and weak interactions) are described. The models are SU(5) and SO(10) at the grand unification theory (GUT) level and SU(4)C × SU(2)L × SU(2)R at the partial unification theory (PUT) level. The tests selected for discussion are the finiteness of the neutrino mass in the