  We study process of radiative neutrino pair emission $|e\rangle \rightarrow
|g \rangle + \gamma +\nu \bar{\nu}$ from coherently excited heavy ions (quantum
mixture of two ionic states, the ground and an excited states) in circular
motion. Determination of the neutrino mass is found to be possible with
simultaneous detection of the photon and one of neutrinos in the pair down to
the level of the smallest neutrino mass of order 5 meV in the three flavor
scheme.
