Are two-beam Dirac interferences mass-independent?

To examine experimentally, whether there are differences between the two-beam Dirac self-interferences of massless and massive particles, modifications of the electron biprism and the neutron double-slit interferometer are proposed as follows: (a) extension of the biprism techniques from electron to photon or heavier ions, and (b) macroscopic elongation in the two-beam interferometers, of the total separated path lengths (TSPL) which are different from the conventional path difference.

The idea, that the interference fringes for heavy masses should become more obscure as the TSPL are lengthened, seems to be conceivable for a natural model, which assumes a kind of spontaneous in-flight transition before the so-called observation starts since the arrival at the counter.

The relationships between the in-flight transition and Prigogine's microscopic irreversible scattering are discussed.