Title: Effects of initial spatial phase in radiative neutrino pair emission,
Abstract: We study radiative neutrino pair emission in deexcitation process of atoms
taking into account coherence effect in a macroscopic target system. In the
course of preparing the coherent initial state to enhance the rate, a spatial
phase factor is imprinted in the macroscopic target. It is shown that this
initial spatial phase changes the kinematics of the radiative neutrino pair
emission. We investigate effects of the initial spatial phase in the photon
spectrum of the process. It turns out that the initial spatial phase provides
us significant improvements in exploring neutrino physics such as the
Dirac-Majorana distinction and the cosmic neutrino background.