  Spectroscopic studies of two beta-rays from 100Mo are shown to be of
potential interest for investigating both the Majorana neutrino mass by
neutrinoless double beta-decay and low energy solar neutrino's by inverse
beta-decay. With a multi-ton 100Mo detector, coincidence studies of correlated
beta-beta from neutrinoless double beta-decay, together with the large Q value,
permit identification of the neutrino-mass term with a sensitivity of ~ 0.03
eV. Correlation studies of the inverse beta and the successive beta-decay of
100Tc, together with the large capture rates for low energy solar neutrino's,
make it possible to detect in realtime individual low energy solar neutrino in
the same detector.

Nuclear Experiment