Next Generation Neutrinoless Double Beta-Decay: Probing Majorana Neutrino Masses Below the 100 meV Level

Neutrinolesss double beta-decay is a unique tool for probing the absolute mass of neutrinos and determining whether the neutrino is a Dirac or Majorana particle. Neutrino oscillations experiments have established several possible scenarios for the heirarchy of neutrino masses. We present ongoing and planned double beta-decay experiments and their potential impact on our understanding of these mass heirarchy scenarios.