  Interstellar travel requires propulsion systems beyond present possibilities
and scientists search for new technologies and breakthrough concepts in
physics. Frederick E. Alzofon came up with an alternative idea on the origin of
the gravitational field. He claimed that the gravitational force arises from
the interaction of subatomic particles and that the gravitational force between
the particles of a system decreases during a process of retrograding from an
ordered system into a disordered system. To proof his assumption, Alzofon used
pulsed dynamic nuclear polarization to create such an order of particles within
a test object and claims to have measured distinct changes in weight. This
paper describes an experiment to investigate Alzofon's assumptions with the use
of NMR spectroscopy for nuclear spin polarization. It could be shown that with
certain measurement parameters, an apparent change in weight was indeed
measured, but finally this turned out to be a temperature effect.
