Inelastic-Scattering Measurements of 1.5-15 eV Neutrons

Johnson, R. G.; Bowman, C.D.

doi:10.1103/physrevlett.49.797

Cited by 14 publications

(14 citation statements)

References 2 publications

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“…Indeed, a common limitation of standard 6 Li-glass [11] neutron counters is the 1=v dependence of their efficiency, v being the neutron velocity. However for an inverse geometry instrument there is the possibility to use the so-called Resonance Detector (RD) configuration [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], where the neutron detection is realized by using a system composed by an analyzer foil and a photon detector. The RD configuration overcomes the efficiency loss of the Li-based neutron counters, providing a counting efficiency that is independent of neutron energy.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…This measurement was done at the 100 MeV linac neutron source of the National Bureau of Standards (USA) [69]. Another measurement performed at the same facility, in the Filter Difference mode [80], was performed using a BGO and a Germanium detector to assess the effectiveness of narrow energy selection windows in the gamma ray cascade spectrum from Table 1.…”

Section: Epithermal Neutrons: the Resonance Detector Techniquementioning

confidence: 99%

“…The RDS counting procedure relies upon two main steps [51,56,61,69,72]: in the first step, the scattered neutron beam impinges onto the analyser foil which provides the energy analysis by means of (n, γ) resonant absorption at a given resonance energy E r . In the second step, the prompt gamma rays are detected and provide the total TOF of the absorbed neutron.…”

Section: Epithermal Neutrons: the Resonance Detector Techniquementioning

confidence: 99%

“…Part of this research activity was addressed to develop and enhance the capabilities and effectiveness of the so-called resonance detector spectrometer (RDS) configuration, conceived and tested in the early 1980s [67][68][69][70][71][72][73]. As historical examples, figures 5 and 6 show TOF spectra recorded in the RDS configuration at the Dubna (Russia) pulsed reactor IBR-30 [74] with a Ge(Li)-149 Sm analyser and the RAT spectrometer [72] at the KENS facility (Japan) [75] with a BGO-Ta analyser, respectively.…”

Section: Epithermal Neutrons: the Resonance Detector Techniquementioning

confidence: 99%

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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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“…As a matter of fact, the standard neutron detectors based on scintillation materials (Li-glass(Ce) or ZnS(Ag)) and/or gas counters ( 3 He tubes) at different pressures (1-20 atm), show an efficiency that decreases as 1=v; v being the neutron velocity. An advantage for an inverse geometry instrument is the possibility to use of the so-called Resonance Detector (RD) configuration, proposed between the end of 1970s and the beginning of 1980s [4][5][6][7][8][9][10][11][12][13][14], and developed in the last years [15][16][17][18][19][20][21] for the VESUVIO spectrometer [22] (ISIS spallation neutron source, United Kingdom). In the RD configuration, neutrons are revealed by using a detection system composed of an analyzer foil, made of a material such as 238 U or 197 Au, and a photon detector.…”

Section: Introductionmentioning

confidence: 99%

Deep inelastic neutron scattering on 207Pb and NaHF2 as a test of a detectors array on the VESUVIO spectrometer

Pietropaolo

Senesi

2008

Nuclear Instruments and Methods in Physics Research Section A:

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A prototype array of resonance detectors for deep inelastic neutron scattering experiments has been installed on the VESUVIO spectrometer, at the ISIS spallation neutron source. Deep inelastic neutron scattering measurements on a reference lead sample and on NaHF 2 molecular system are presented. Despite on an explorative level, the results obtained for the values of mean kinetic energy hE k i are found in good agreement with the theoretical predictions, thus assessing the potential capability of the device for a routine use on the instrument. r

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Inelastic-Scattering Measurements of 1.5-15 eV Neutrons

Cited by 14 publications

References 2 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

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

Deep inelastic neutron scattering on 207Pb and NaHF2 as a test of a detectors array on the VESUVIO spectrometer

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