Model-independent analysis of inelastic-neutron-scattering data at high momentum transfer

Filabozzi, A.; Pace, E.; Mayers, J.

doi:10.1103/physrevb.54.6255

Cited by 12 publications

(15 citation statements)

References 33 publications

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“…As expected on theoretical grounds, the simulations including the FSE show both a recoil peak shift and asymmetries in the line shape [51] at low scattering angles, where the lowest ' o and q are achieved. On the contrary, at low times of flight (i.e.…”

supporting

confidence: 84%

Enhancing the performances of a resonance detector spectrometer for deep inelastic neutron scattering measurements

Filabozzi¹,

Pace²,

Pietropaolo

2012

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tThe possibility is explored to sum up neutron Compton profiles at different scattering angles in deep inelastic neutron scattering measurements within the Resonance Detector (RD) configuration to enhance the statistics for a more reliable extraction of the momentum distribution of the constituents in the target. The RD configuration allows to select the energy of the scattered neutrons up to several tens of electron Volt, thus accessing energy and wave vector transfers well above 1 eV and 30ÅÀ 1 , respectively. In the high-q/o regime, the final state effects could be considered as negligible, as shown in a series of simulations using a Monte Carlo method with different inverse geometry instrument setups. The simulations show that it could be possible to conceive an instrument set up where the RD configuration allows the proper summation of several spectra at different scattering angles, providing a good separation of the proton recoil signal from that of the heavier atoms, thus avoiding the cell subtraction by fitting procedure.

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supporting

confidence: 84%

Enhancing the performances of a resonance detector spectrometer for deep inelastic neutron scattering measurements

Filabozzi¹,

Pace²,

Pietropaolo

2012

Nuclear Instruments and Methods in Physics Research Section A:

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“…In the present experiment, the Lorentzian and the Gaussian components of the resolution functions are reported in Table II. 59,61,62 It can be appreciated that both Gaussian and Lorentzian contributions to the R n ͑y , q͒ function decrease as q increases, i.e., scattering angle increases.…”

Section: Experiments and Data Analysismentioning

confidence: 99%

Proton quantum coherence observed in water confined in silica nanopores

Garbuio

Imberti

Pietropaolo

et al. 2007

The Journal of Chemical Physics

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Deep inelastic neutron scattering measurements of water confined in nanoporous xerogel powders, with average pore diameters of 24 and 82 Å, have been carried out for pore fillings ranging from 76% to nearly full coverage. DINS measurements provide direct information on the momentum distribution n͑p͒ of protons, probing the local structure of the molecular system. The observed scattering is interpreted within the framework of the impulse approximation and the longitudinal momentum distribution determined using a model independent approach. The results show that the proton momentum distribution is highly non-Gaussian. A bimodal distribution appears in the 24 Å pore, indicating coherent motion of the proton over distances d of approximately 0.3 Å. The proton mean kinetic energy ͗E K ͘ W of the confined water molecule is determined from the second moment of n͑p͒. The ͗E K ͘ W values, higher than in bulk water, are ascribed to changes of the proton dynamics induced by the interaction between interfacial water and the confining surface.

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“…There has been a considerable theoretical interest in the calculation of FSE [4][5][6][7][8][9][10][11] during the past 20 years. However, there are still few experimental studies, with which calculation can be compared and these are mainly on quantum fluids [12][13][14][15][16].…”

mentioning

confidence: 99%

Measurement of anisotropies of the kinetic energy and anharmonicity in pyrolytic graphite by neutron Compton scattering

Fielding¹,

Timms²,

Mayers³

1998

Europhys. Lett.

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Neutron Compton scattering (NCS) measurements of the anisotropy of the momentum distribution and the mean Laplacian of the interatomic potential ⟨∇2V⟩ have been performed using electron volt neutrons, with wave vector transfers between 24 Å−1 and 98 Å−1. The measured momentum distribution of the atoms displays significantly more anisotropy than a calculation using a model density of states. We have observed anisotropies in ⟨∇2V⟩ for the first time. The results suggest that the atomic potential is harmonic within the graphite planes, but anharmonic for vibrations perpendicular to the planes.

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Model-independent analysis of inelastic-neutron-scattering data at high momentum transfer

Cited by 12 publications

References 33 publications

Enhancing the performances of a resonance detector spectrometer for deep inelastic neutron scattering measurements

Enhancing the performances of a resonance detector spectrometer for deep inelastic neutron scattering measurements

Proton quantum coherence observed in water confined in silica nanopores

Measurement of anisotropies of the kinetic energy and anharmonicity in pyrolytic graphite by neutron Compton scattering

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