  A profusion of unbound, low-energy electrons creates a local electric field
that reduces Coulomb potential and increases quantum tunneling probability for
pairs of nuclei. Neutral beam-target experiments on deuterium-deuterium fusion
reactions, observed with neutron detectors, show percentage increases in fusion
products are consistent with electron-screening predictions from Schrodinger
wave mechanics. Experiments performed confirm that observed fusion rate
enhancement with a negatively biased target is primarily due to changes to the
fusion cross section, rather than simply acceleration due to electrostatic
forces.
