published_or_final_version / Physics / Doctoral / Doctor of Philosophy

Thesis (Ph. D.)--University of Hong Kong, 1980. / Typescript.

Thesis (Ph. D.)--University of Adelaide, Dept. of Physics, 1984. / Includes bibliographical references (leaves 117-124).

Thesis (Ph. D.)--Dept. of physics, University of Adelaide, 1983. / Includes bibliographical references.

Bibliography: leaves 117-124 / 124 leaves,[31] leaves : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physics, 1984

Includes bibliographical references / 119 leaves, [67] leaves : ill., maps ; 31 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--Dept. of physics, University of Adelaide, 1983

Thesis (M. Sc.)--University of Canterbury, 2007. / Typescript (photocopy). Includes bibliographical references (p. 62-63). Also available via the World Wide Web.

Thesis (M. Sc.)--University of Canterbury, 2009. / Typescript (photocopy). "July 15, 2009." Includes bibliographical references (p. 71-73). Also available via the World Wide Web.

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (p. 71-76).

Orientador: Orlando Luís Goulart Peres / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin / Made available in DSpace on 2018-08-28T09:46:02Z (GMT). No. of bitstreams: 1 Stenico_GabrielaVitti_M.pdf: 1514550 bytes, checksum: b70ae6f3e134ec870b16bf48feb2f637 (MD5) Previous issue date: 2015 / Resumo: Neutrinos atmosféricos são produzidos a partir de interações de raios cósmicos com a atmosfera terrestre que geram partículas secundárias instáveis as quais decaem fracamente em neutrinos. Por possuirem um amplo espectro de energia, que engloba algumas centenas de MeV a energias na ordem de TeV, esses neutrinos são bons objetos no teste de novas teorias, bem como no estudo do fenômeno de oscilação de neutrinos, onde há mudança do estado de sabor do neutrino para outro. Além disso, neutrinos atmosféricos constituem o ruído de fundo na calibração de telescópios de neutrinos astrofísicos e na busca por processos raros, o que nos motiva a estudar como se dá sua produção e evolução na atmosfera. Desse modo, buscamos determinar o fluxo de neutrinos atmosféricos através das reações básicas de criação dos mesmos por interações fracas e dos processos de absorção e espalhamento das partículas-mães carregadas, como píons e múons, gerados pela interação de prótons, principal constituinte dos raios cósmicos, com a atmosfera. Para isso, procederemos a resolver sistemas de equações de cascatas que relacionam termos sumidouros e fonte das partículas do fluxo para obtermos sua evolução até a superfície terrestre, de modo a incluir as características da atmosfera e geometria de incidência do feixe de partículas primárias, avaliando a consistência dos cálculos e comparando-os com resultados presentes na literatura. Feito isso, estenderemos o resultado incluindo um decaimento exótico, que não existe no Modelo Padrão, para ver se podemos testá-lo em experimentos de neutrinos atmosféricos / Abstract: Atmospheric neutrinos are produced by interactions of cosmic rays with the Earth¿s atmosphere that create unstable secondary particles which weakly decay into neutrinos. Because of its wide energy spectrum, that covers energies of few hundred of MeV until energies on the order of TeV, these neutrinos are good objects on the test of new theories as well as the study of neutrino oscillation phenomenon where there is a change in the state of neutrino flavour to another. In addition, atmospheric neutrinos constitute background and calibration beam for astrophysical neutrino telescopes and the search for rare processes, which motivates us to study how is its production and evolution in the atmosphere. In this way, we want to determine the flux of atmospheric neutrinos through the basic reactions of its creation by weak interactions and the processes of absorption and scattering of charged parent particles, as pions and muons, generated by the interaction of protons, main constituent of cosmic rays with the atmosphere. For this, we will solve cascade equations that relate source and sink terms of the particle flux to obtain its evolution until the earth surface, including the atmosphere characteristics and geometry of primary particle incidence beam, evaluating the consistency of the calculations and comparing them with the results found in the literature. Done that, we will extend the results including an exotic decay, which does not exist in the Standard Model, to see if we can test it on atmospheric neutrino experiments / Mestrado / Física / Mestra em Física / 156339/2013 / 2014/00347-3 / CNPQ / FAPESP