Advances on detectors for low-angle scattering of epithermal neutrons

Perelli-Cippo, E.; Gorini, G.; Tardocchi, M.; Pietropaolo, A.; Senesi, R.; Rhodes, N.J.; Schoonveld, E M

doi:10.1088/0957-0233/19/4/047001

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…At forward scattering there are 64 (S135-S198 in figure 2) cerium doped yttrium aluminium perovskite (YAP) γ -ray detectors [13][14][15]. These are at a distance of between 50 and 75 cm from the sample position and are arranged in eight columns each containing 8 detectors, with 4 above and 4 below the horizontal plane passing through the sample centre (see figure 1).…”

Section: Description Of the Vesuvio Instrumentmentioning

confidence: 99%

The VESUVIO electron volt neutron spectrometer

Mayers

Reiter

2012

Meas. Sci. Technol.

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This paper describes the VESUVIO electron volt neutron spectrometer at the ISIS pulsed neutron source and its data analysis routines. VESUVIO is used primarily for the measurement of proton momentum distributions in condensed matter systems, but can also be used to measure the kinetic energies of heavier masses and bulk in-situ sample compositions. A series of VESUVIO runs on the same zirconium hydride sample over the past two years show that (1) kinetic energies of protons can be measured to an absolute accuracy of ∼1%. (2) Measurements of the proton momentum distribution n(p) are highly reproducible from run to run. This shows that small changes in kinetic energy and the detailed shape of n(p) with parameters such as temperature, pressure and sample composition can be reliably extracted from VESUVIO data. (3) The impulse approximation (IA) is well satisfied on VESUVIO. (4) The small deviations from the IA due to the finite momentum transfer of measurement are well understood. (5) There is an anomaly in the magnitude of the inelastic neutron cross-section of the protons in zirconium hydride, with an observed reduction of 10% ± 0.3% from that given in standard tables. This anomaly is independent of energy transfer to within experimental error. Future instrument developments are discussed. These would allow the measurement of n(p) in other light atoms, D, 3He, 4He, Li, C and O and measurement of eV electronic and magnetic excitations.

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Section: Description Of the Vesuvio Instrumentmentioning

confidence: 99%

The VESUVIO electron volt neutron spectrometer

Mayers

Reiter

2012

Meas. Sci. Technol.

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“…This requires scattering angles <10 • , incident energies ∼100 eV and close to elastic scattering [20]. It has been shown [21] that inverse geometry instruments give an energy resolution of ∼0.5 eV for incident energies ∼100 eV, compared with the resolution of ∼50 eV currently available on MARI. Thus direct geometry spectrometers currently have two orders of magnitude worse resolution for such measurements.…”

Section: Comparison Of Foil Cycling Filter Difference Methods In Inve...mentioning

confidence: 99%

“…To increase statistical accuracy the data and calculations from the 8 'closest' detectors to the sample at ∼56 cm (4,20,44,60,8,24,48,64 in table 1) were summed. A comparison was also made for the eight detectors 'furthest' from the sample (9,25,33,49,13,29,37, 53 in table 1) at ∼76 cm. The calculations were made for the values of the scattering angle θ , final flight path L 1 and height h, determined for each detector by calibration [18].…”

Section: Comparison With Datamentioning

confidence: 99%

“…The VESUVIO 6 Li-doped neutron detectors at forward scattering angles were replaced in February 2008 by yttrium aluminium perovskite (YAP)-doped γ -ray detectors [13][14][15]. Although these do not detect neutrons directly, they are made to function both as neutron detectors and energy selectors by placing a gold foil on the YAP detector surface [16].…”

Section: Introductionmentioning

confidence: 99%

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Calculation of background effects on the VESUVIO eV neutron spectrometer

Mayers

2010

Meas. Sci. Technol.

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The VESUVIO spectrometer at the ISIS pulsed neutron source measures the momentum distribution ) (p n of atoms by "neutron Compton scattering" (NCS) . Measurements of ) (p n provide a unique window on the quantum behaviour of atomic nuclei in condensed matter systems. The VESUVIO 6 Li doped neutron detectors at forward scattering angles were replaced in Feb 2008 by Yttrium Aluminium Perovskite doped (YAP) γ-ray detectors. These provide a much superior resolution and general performance, but suffer from a sample dependent gamma background. This report details how this background is calculated and data corrected. The report also indicates how this background can be reduced.

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“…Reproduced with permission from [103]. Copyright IOP Publishing Ltd. detector bank (VLAD) on VESUVIO, [97], are discussed in [104]. Shielding individual detectors is inefficient, but crosstalk can be effectively reduced by maintaining a sufficient distance between detectors at different scattering angles.…”

Section: Crosstalk Reductionmentioning

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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Advances on detectors for low-angle scattering of epithermal neutrons

Cited by 6 publications

References 15 publications

The VESUVIO electron volt neutron spectrometer

The VESUVIO electron volt neutron spectrometer

Calculation of background effects on the VESUVIO eV neutron spectrometer

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

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