Neutron Compton scattering

These NCS experiments [Chatzidimitriou-Dreismann 1997 (a) Chatzidimi-triou-Dreismann 1999 Karlsson 1999], which were motivated by the theoretical work of C. A. Chatzidimitriou-Dreismann [Chatzidimitriou-Dreismann 1991 Chatzidimitriou-Dreismann 1997 (b)] on protonic quantum entanglement in condensed systems and by the results of a an earlier Raman experiment on liquid H O / D O mixtures [Chatzidimitriou-Dreismann 1995], were followed by a series of other experiments on liquid and solid organic materials [Chatzidimitriou-Dreismann 2000 (b) Chatzidimitriou-Dreismann 2001 Chatzidimitriou-Dreismann 2002 (a)], various metallic hydrides [Abdul-Redah 2000 Karlsson 2002 (b) Karlsson 2003 (b)], liquid hydrogen [Chatzidimitriou-Dreismann 2004 (b)] and among others an ionic solid [Abdul-Redah 2004] using the same experimental technique, i.e., neutron Compton scattering. All these experiments confirmed the anomalous results found earlier and also revealed certain new aspects of the considered effect. 

Keywords Quantum entanglement, sub-femtosecond dynamics, neutron Compton scatter-... 

Keywords Quantum entanglement, attosecond physics, Neutron Compton scattering... 

Keywords Attosecond dynamics, neutron Compton scattering, electron-proton Compton... 

Neutron Compton scattering from water and H20 - D20 mixtures... 

Neutron Compton scattering from liquid benzene... 

Neutron Compton scattering from amphiphilic molecules... 

Neutron Compton scattering from molecular hydrogen... 

Another consequence of the momentum spread is that it compresses the time for the formation of the outgoing neutron wave. As first shown by Reiter and Silver [Reiter 1985] and Sears [Sears 1984] and later described in detail by Watson [Watson 1996], this leads to a characteristic neutron Compton scattering time tncs = Mh/[q(0) Ap] where q(0) is the 9 dependent momentum transfer. With typical values for the momentum spread Ap, this leads to the characteristic times tncs for scattering on 77 and D shown in Fig. 3. 

Figure 5 Schematic representation of neutron Compton scattering on an entangled pair of identical particles. The state is a superposition corresponding to particles a and (3 receiving the recoil during the scattering process.

Abstract We present an example of a situation where Fermi s golden rule does not apply, even if an unstable quantum system decays exponentially. The work is inspired by the recent experiments by Chatzidimitriou-Dreismann and co-workers on reduction of the neutron Compton scattering cross-section in hydrogenated compounds. Although full quantitative explanation of these experimental results is still to be accomplished, our preliminary results show a possibility of strong modification of the scattering cross-section. 

Keywords Irreversible dynamics, entanglement, decoherence, neutron Compton scattering,... 

Quantum Decoherence at the Femtosecond Level in Liquids and Solids Observed by Neutron Compton Scattering... 

In recent experiments, there are also indications for an energy shift in connection with the breaking of the n-p entanglement in neutron Compton scattering. Comments on this possibility will be given at the end of this chapter. 

As pointed out already in this chapter, the basic reason for the specific phenomena discussed above is the neutron-proton or neutron-deuteron entanglement, which itself is a natural consequence of the interaction of the particles during scattering. Neutron Compton scattering has a time window short enough for these entanglement effects to be observed. 

Neutron Compton scattering (NCS) is the measurement of atomic momentum distributions, n p), in condensed matter systems by high-energy inelastic neutron scattering. NCS measurements are particularly important in the study of quantum fluids. 

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