A TEST OF THE EQUIVALENCE PRINCIPLE BY LONG-BASE-LINE NEUTRINO-OSCILLATION EXPERIMENTS

We show that a breakdown of the universality of the gravitational coup lings to different neutrino flavors can be tested in long-baseline neu trino-oscillation experiments. In particular we have analyzed in detai l a proposed experiment at SOUDAN 2 with nu(mu) beams from the Fermila b Main Injector. It turns out that we can study both masses of neutrin os and such a breakdown with sensitivity to the order of 10(-14) by in vestigating the energy spectrum of the resulting muons.