We note that the fine structure at the endpoint region of the beta decay spectrum is now essentially known using neutrino oscillation data, if the mass of one neutrino is specified. This may help to identify the effects of nonzero neutrino masses in future experiments. An exact treatment of phase space kinematics is used. This work is independent of theoretical models. Additional restrictions due to the assumption of a so-called "complementary ansatz" for the neutrino mass matrix are also discussed.
Schechter, Joseph; Masood, Samina S.; and Nasri, Salah, "Fine Structure of Beta Decay Endpoint Spectrum" (2005). Physics. Paper 273.
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