Macroscopic Quantum-Mechanical Scattering. Coherent Scattering of Neutrinos

In certain conditions a macroscopic quantum-mechanical scattering may occur, which may lead to a coherent cross-section on a macroscopic scale in a mono-crystal. The conditions are satisfied by neutrinos, but not satisfied by other projectiles, with a higher cross-section. This may explain Weber-type experiments of neutrino detection by a perfect, stiff sapphire mono-crystal. The occurrence of coherence domains for quantum-mechanical scattering and classical diffraction is analyzed, and the force exerted upon a macroscopic target is estimated. It is concluded that neutrinos exhibit a distinctive feature in this respect, due precisely to their very small cross-section.