  The photon spectrum in macrocoherent atomic de-excitation via radiative
emission of neutrino pairs (RENP) has been proposed as a sensitive probe of the
neutrino mass spectrum, capable of competing with conventional neutrino
experiments. In this paper we revisit this intriguing technique in order to
quantify the requirements for statistical determination of some of the
properties of the neutrino spectrum, in particular the neutrino mass scale and
the mass ordering. Our results are sobering. We find that, even under ideal
conditions, the determination of neutrino parameters needs experimental live
times of the order of days to years for several laser frequencies, assuming a
target of volume of order 100 cm3 containing about 10^21 atoms per cubic
centimeter in a totally coherent state with maximum value of the electric field
in the target. Such conditions seem to be, as of today, way beyond the reach of
our current technology.
