  In anticipation of results from current and future double-beta decay studies,
we report a measurement resulting in a 82Se double-beta decay Q-value of
2997.9(3) keV, an order of magnitude more precise than the currently accepted
value. We also present preliminary results of a calculation of the 82Se
neutrinoless double-beta decay nuclear matrix element that corrects in part for
the small size of the shell model single-particle space. The results of this
work are important for designing next generation double-beta decay experiments
and for the theoretical interpretations of their observations.
