Where are protons and deuterons in KH p D 1 − p CO 3 ? A neutron diffraction study
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Evidence of macroscopically entangled protons in a mixed isotope crystal of KH(p)D(1-p)CO3.
We examine whether protons and deuterons in a crystal of KH(0.76)D(0.24)CO(3) at 300 K are particles or matter waves. The neutron scattering function measured over a broad range of reciprocal space reveals the enhanced diffraction pattern anticipated for antisymmetrized macroscopic states for protons (fermions). These features exclude a statistical distribution of protons and deuterons. Raman s...
متن کاملWhere are Protons and Deuterons in KHpD1-pCO3? A Neutron Diffraction Study
The crystals of potassium hydrogen carbonate (KHCO3) and the KDCO3 analogue are isomorphous. They are composed of hydrogen or deuterium bonded centrosymmetric dimers (HCO−3 )2 or (DCO − 3 )2. The space group symmetry of KHpD1−pCO3 (p ≈ 0.75) determined with neutron diffraction is identical to those of KHCO3 and KDCO3. This is at variance with a random distribution of H and D nuclei. These cryst...
متن کاملNonlocal protons and deuterons oppose to disorder: A single-crystal neutron diffraction study of KH0.76D0.24CO3 and a theoretical framework
We show with neutron diffraction that a single-crystal of potassium hydrogen deuterium carbonate at room temperature, namely KH0.76D0.24CO3, is isomorphous with the KHCO3 and KDCO3 derivatives. Protons and deuterons are not disordered particles located at definite sites and Bragg peaks are best fitted with separate H and D sublattices. We propose a theoretical framework for nonlocal observables...
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Pyridine-3,5-dicarboxylic acid has been studied by single-crystal neutron diffraction at 15 and 296 K. Pyridine-3,5-dicarboxylic acid, in which the carboxylic acid protons have been replaced by deuterons, has also been studied at 15, 150 and 296 K. The protonated structure contains a short N...H...O hydrogen bond [N...O 2.523 (2) Angstrom at 15 K]. Temperature-dependent proton migration occurs ...
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Protons of 35 and 65 MeV and deuterons of 35 MeV were used to bombard beryllium and lithium targets of various thicknesses. Four types of experiments were conducted in order to characterize the neutron fields. They were (1) central axis depth-dose measurements in a water phantom, (2) dose buildup at small depths in tissue-equivalent plastic, (3) microdosimetric measurements and LET distribution...
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