text: does the gamma-rays refract like ordinary rays (visible light)?   yes. but more technically, it is diffraction. gamma rays are high frequency light and will diffract, simmilar to ordinary light, except that you need to use a diffraction grating with a short enough spacing.  compton scattering is an example.  most physicists will say it is the wave-function that determines where the 'photon' goes.  it turns out that schrodinger and compton did a wave derivation of the compton effect.  the other issue is to show the distinction between the photon model and a good alternative.  it is called the loading theory.  in my experiments, i have made the gamma ray go two ways at once, like a beam-splitter.  quantum mechanics says the photon should go one way or antother.  the experiment also works with what they call atoms.  i have made the helium ion wave function go both ways defying qm.  i think it is possible to refract gamma, but have not done it, but fundamentally it should, and perhaps can be seen in astronomy.