Energy Loss of Neutrinos in 20M⊙ Star

Current ideas on neutrino oscillation plus confirmation from neutrino experiments make possible the changing of neutrino flavor due to interactions with the electrons in medium. When neutrinos pass through a medium and interact with the electrons, an effective potential energy is produced due to coherent forward scattering that occurred in the medium. This potential engenders significant changes in the neutrino masses and their mixing in the medium. Thus electron neutrinos would oscillate into different mass eigenstate and this is dependent on the energy of the neutrinos. Some of the energy will be lost in the coherent scattering with the electrons by the charged current interaction. We have calculated the energy loss of the neutrinos by using a stopping power equation for a 20M⊙ star.