por
Joachim Kopp
(Max-Planck-Institut für Kernphysik, Heidelberg)
→
Europe/Madrid
Sala Seminarios IFIC (Edf. Institutos de Investigación)
Sala Seminarios IFIC
Edf. Institutos de Investigación
Descripción
Recently, Raghavan has proposed an experiment to study neutrinos emitted and absorbed in recoil-free processes. We discuss the theory of these "Mössbauer neutrinos", paying special attention to the oscillation phenomenology. In particular, we will show that, in spite of the extremely good energy resolution of the proposed experiment, Mössbauer neutrinos can oscillate. After giving quantum mechanical arguments to support this statement, we will compute the oscillation probability of Mössbauer neutrinos, including localization and decoherence terms, in a quantum mechanical wave packet model. We will then proceed to the calculation of the combined rate of Mössbauer neutrino emission, propagation and absorption in the framework of quantum field theory. This approach allows us to avoid making any a priori assumptions on the neutrino wave function, and it can easily describe the various effects that broaden the neutrino emission and absorption lines. Finally, we will also address the unrealistic, but theoretically extremely interesting, case of Mössbauer neutrinos affected only by natural line broadening and not by solid state effects.