Abstract
Recent neutron Compton scattering (NCS) investigations on niobium, palladium and yttrium hydrides at ambient temperatures revealed a striking anomalous behaviour of the total neutron scattering cross-section densities of protons, in the sub-femtosecond time scale. These experiments were motivated by: (i) our previous theoretical work on short-lived quantum entanglement (QE) of protons in condensed matter, and (ii) our first experimental verification of this effect with NCS from liquid H2O/D2O mixtures. Based on elementary and/or basic results of neutron scattering theory, and incorporating the effects of QE and decoherence into the formalism, a first-principles theoretical interpretation of this novel effect is provided.
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