JOSEPHSON-LIKE TUNNELING BEHAVIOR OF POLARIZED NEUTRON WAVE-PARTICLESAND POSSIBILITIES OF MEASURING VERY LARGE PENETRATION DEPTHS BY POLARIZED NEUTRON REFLECTOMETRY

It is shown that the tunneling of polarized neutron wave-particles off ers new possibilities for the investigation of surface diamagnetism in superconductors. As an example, a thin film Fabry-Perot resonator of natural vanadium sandwiched between two isotopical vanadium 50 thin fi lms in the Meissner state, under total reflection, is considered. This method allows the possibility of measuring strong magnetic penetratio n depths up to 45000 Angstrom. The related sensitivity to penetration depth ratio Delta Lambda/Lambda and the external magnetic field is of the order of 1 parts per thousand and 1.2 G respectively.