Calculation of background effects on the VESUVIO eV neutron spectrometer

Mayers, J.

doi:10.1088/0957-0233/22/1/015903

Cited by 29 publications

(34 citation statements)

References 25 publications

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“…The latter eliminates any possible spurious distortion due to inaccurate subtraction of the O, Al contributions. 25 The uncertainty in the determined mean kinetic energy, E K , 11% in the previous measurements, 8 is 2% in the present case. Moreover, the current resolution line shape has a finite variance, allowing us also to carry out non parametric determinations of E K as outlined below.…”

Section: Introductionmentioning

confidence: 49%

“…The R l (y, q) functions have been determined using a standard procedure successfully employed for DINS experiments in a variety of systems: 35 the modified DINSMS Monte Carlo code 31 has been used to simulate the scattering of a polycrystalline Pb sample, which is currently used as a resolution calibration standard on VESUVIO. 25 DINS scattering from lead is dominated by the spectrometer's resolution, therefore a comparison between simulated and measured scattering from Pb provides an assessment of the reliability of the code to describe the spectrometer's response. A simulation of DINS scattering spectra in the IA is carried out for a fictitious sample with mass = 1.0079 amu and momentum distribution width σ = 0.001 Å −1 , i.e., assuming a scattering sample with infinitely narrow momentum distribution.…”

Section: B Data Analysismentioning

confidence: 99%

See 1 more Smart Citation

Spherical momentum distribution of the protons in hexagonal ice from modeling of inelastic neutron scattering data

Flammini

Pietropaolo

Senesi

et al. 2012

The Journal of Chemical Physics

107

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Adiabatic and non-adiabatic quantum dynamics calculation of O(1D) + D2 OD + D reaction J. Chem. Phys. 135, 234301 (2011) New ab initio coupled potential energy surfaces for the Br(2P3/2, 2P1/2) + H2 reaction J. Chem. Phys. 135, 164311 (2011) Reaction between graphene and hydrogen under oblique injection J. Appl. Phys. 110, 084320 (2011) An experimental and computational study of the reaction of ground-state sulfur atoms with carbon disulfide J. Chem. Phys. 135, 144306 (2011) The dissociative chemisorption of methane on Ni(100): Reaction path description of mode-selective chemistry J. Chem. Phys. 135, 114701 (2011) Additional information on J. Chem. Phys. The spherical momentum distribution of the protons in ice is extracted from a high resolution deep inelastic neutron scattering experiment. Following a recent path integral Car-Parrinello molecular dynamics study, data were successfully interpreted in terms of an anisotropic Gaussian model, with a statistical accuracy comparable to that of the model independent scheme used previously, but providing more detailed information on the three dimensional potential energy surface experienced by the proton. A recently proposed theoretical concept is also employed to directly calculate the mean force from the experimental neutron Compton profile, and to evaluate the accuracy required to unambiguously resolve and extract the effective proton potential from the experimental data.

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Section: Introductionmentioning

confidence: 49%

Section: B Data Analysismentioning

confidence: 99%

Spherical momentum distribution of the protons in hexagonal ice from modeling of inelastic neutron scattering data

Flammini

Pietropaolo

Senesi

et al. 2012

The Journal of Chemical Physics

107

View full text Add to dashboard Cite

show abstract

“…As an example of the quality of data for each of the 48 detectors used in the experiment, we report in Fig. 1 the raw time of flight data recorded by a single detector, after gamma background correction [47], together with the evaluation of the multiple scattering contribution, for ice Ih at T = 5 K.…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of the zero point kinetic energy in ice and water above room temperature

2013

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a b s t r a c tBy means of Deep Inelastic Neutron Scattering we determined the temperature dependence of the proton kinetic energy in polycrystalline ice Ih between 5 K and 271 K. We compare our results with predictions form Path Integral quantum simulations and semiclassical quasi-harmonic models with phasedependent frequencies. The latter show the best agreement with the experiment if the librational contribution is properly taken into account. The kinetic energy increase with temperature in ice is also found to be approximately a factor $ 5 smaller than in the case of liquid water above room temperature, highlighting the role played by anharmonic quantum fluctuations in the two phases.

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“…A detailed discussion of this effect is beyond the scope of this paper. Instead, the reader is referred to [103] for an in depth description of this background component and a discussion of how to deal with its effect. As an illustration of how the gamma rays emitted by the cycling foil can distort a DINS FCT signal, figure 32 shows an analytical calculation of the effect of a 20 cm × 20 cm 2 Au cycling foil, moving by 20 cm, for a Pb sample and a sample to detector distance of 55 cm.…”

Section: Residual Backgroundmentioning

confidence: 99%

“…As an illustration of how the gamma rays emitted by the cycling foil can distort a DINS FCT signal, figure 32 shows an analytical calculation of the effect of a 20 cm × 20 cm 2 Au cycling foil, moving by 20 cm, for a Pb sample and a sample to detector distance of 55 cm. The residual background is not easily prevented, but, in most cases, can be removed with a simple data processing algorithm [103].…”

Section: Residual Backgroundmentioning

confidence: 99%

Radiative neutron capture as a counting technique at pulsed spallation neutron sources: a review of current progress

et al. 2016

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Neutron scattering techniques are attracting an increasing interest from scientists in various research fields, ranging from physics and chemistry to biology and archaeometry. The success of these neutron scattering applications is stimulated by the development of higher performance instrumentation. The development of new techniques and concepts, including radiative capture based neutron detection, is therefore a key issue to be addressed.Radiative capture based neutron detectors utilize the emission of prompt gamma rays after neutron absorption in a suitable isotope and the detection of those gammas by a photon counter. They can be used as simple counters in the thermal region and (simultaneously) as energy selector and counters for neutrons in the eV energy region. Several years of extensive development have made eV neutron spectrometers operating in the so-called resonance detector spectrometer (RDS) configuration outperform their conventional counterparts. In fact, the VESUVIO spectrometer, a flagship instrument at ISIS serving a continuous user programme for eV inelastic neutron spectroscopy measurements, is operating in the RDS configuration since 2007.In this review, we discuss the physical mechanism underlying the RDS configuration and the development of associated instrumentation. A few successful neutron scattering experiments that utilize the radiative capture counting techniques will be presented together with the potential of this technique for thermal neutron diffraction measurements. We also outline possible improvements and future perspectives for radiative capture based neutron detectors in neutron scattering application at pulsed neutron sources.

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Calculation of background effects on the VESUVIO eV neutron spectrometer

Cited by 29 publications

References 25 publications

Spherical momentum distribution of the protons in hexagonal ice from modeling of inelastic neutron scattering data

Spherical momentum distribution of the protons in hexagonal ice from modeling of inelastic neutron scattering data

Temperature dependence of the zero point kinetic energy in ice and water above room temperature

Radiative neutron capture as a counting technique at pulsed spallation neutron sources: a review of current progress

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