Quasi-Differential Neutron Scattering in Zirconium from 0.5 to 20 MeV

Barry, D. P.; Leinweber, G.; Block, Robert C.; Donovan, Timothy J.; Danon, Y.; Saglime, F. J.; Daskalakis, A.; Rapp, M. J.; Bahran, Rian

doi:10.13182/nse12-1

Cited by 12 publications

(8 citation statements)

References 5 publications

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“…Detector details and modeling parameters were previously described in [2][3][4]. Detector positions (angles relative to the incident neutron beam) were selected based on several criteria, including discrepancies between different nuclear data libraries, as described in [1]. All signals from a detector were passed to an Agilent-Acqiris AP240 digitizer.…”

Section: Methodsmentioning

confidence: 99%

“…Over the past decade several neutron scattering experiments were performed at the Rensselaer Polytechnic Institute (RPI) Gaerttner Linear Accelerator (LINAC) Facility [1][2][3][4][5]. The RPI neutron scattering system was designed to benchmark the cumulative effects from neutron scattering from a sample.…”

Section: Introductionmentioning

confidence: 99%

“…The RPI neutron scattering system was designed to benchmark the cumulative effects from neutron scattering from a sample. A term commonly used to describe this measurement is "quasi-differential" neutron scattering due to several factors: thick samples increased the probability of multiple scattering events; detectors were positioned close to the scattering samples to improve signal strength; and the neutron source produced neutrons with a wide range of energies [1]. These features reduced experimental uncertainty by improving the neutron count rate over a range of neutron energies in the region of interest (ROI), 0.5 and 20 MeV.…”

Section: Introductionmentioning

confidence: 99%

“…These features reduced experimental uncertainty by improving the neutron count rate over a range of neutron energies in the region of interest (ROI), 0.5 and 20 MeV. Scattering measurements were performed with beryllium-9 [2], elemental molybdenum [2], elemental zirconium [1], uranium-238 [3], elemental iron [4], and elemental lead [5]. Each of these measurements compared the experimental data to MCNP simulations that modeled evaluated nuclear data libraries such as ENDF/B-VII.1 [6], JEFF-3.2 [7], or JENDL-4.0 [8].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of beryllium and molybdenum nuclear data files with the RPI neutron scattering system in the energy region from 0.5 to 20 MeV

et al. 2017

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A series of neutron scattering benchmark measurements were performed on beryllium and molybdenum with the Rensselaer Polytechnic Institute's Neutron Scattering System. The pulsed neutron source was produced by the Rensselaer Polytechnic Institute's Linear Accelerator and a well collimated neutron beam was incident onto the samples located at a distance of 30.07 m. Neutrons that scattered from the sample were measured using the time-of-flight by eight EJ-301 liquid scintillator detectors positioned 0.5 m from the sample of interest. A total of eight experiments were performed with two sample thicknesses each, measured by detectors placed at two sets of angles. All data were processed using pulse shape analysis that separated the neutron and gamma ray events and included a gamma misclassification correction to account for erroneously identified gamma rays. A detailed model of the neutron scattering system simulated each experiment with several current evaluated nuclear data libraries and their predecessors. Results for each evaluation were compared to the experimental data using a figure-of-merit. The neutron scattering system has been used as a means to quantify a library's performance.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of beryllium and molybdenum nuclear data files with the RPI neutron scattering system in the energy region from 0.5 to 20 MeV

et al. 2017

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“…An assessment of the systematic uncertainty in this methodology was derived from a sample of carbon that was measured with the sample of interest in all experiments. Previous measurements were reported for Mo [1], Zr [3], U-238 [4], Fe [5], Mo and Be [6] and Pb [7]. For the case of Fe it was also possible to obtain the ratio of inelastic to elastic scattering for the first inelastic state, and the elastic only scattering yield [5].…”

Section: Introductionmentioning

confidence: 98%

Experiments with neutron induced neutron emission from U-235, Pu-239, and graphite

et al. 2020

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A neutron induced neutron emission experiment was conducted as the Los Alamos Neutron Science Center (LANSCE) facility at Los Alamos National Laboratory (LANL). In this experiment, a sample was placed in a well collimated neutron beam and was surrounded by an array of 28 fast neutron detectors (EJ-309). The experiment was performed with a neutron flight path of 21.5 m from the source to the sample, and 1 m from the sample to the detectors. The neutron emission from the sample was measured as a function of neutron time of flight covering an incident energy range from 0.7- 20 MeV. The samples included U-235, Pu-239, carbon (graphite), and blanks that matched the encapsulation of the sample. The measured samples were constantly cycled in and out of the neutron beam. This type of experiment measures neutron emission from all reactions occurring in the sample such as fission and elastic and inelastic scattering. Similar to the methodology previously developed at RPI [1], the measurements were compared with detailed simulations of the experiment using different cross section evaluations for the sample. The observed differences can be attributed to the evaluated neutron cross section and angular distributions. The carbon sample was used as a reference to validate both the experiment and simulation methodology and showed good agreement between experiments and simulations. A review of the experimental setup, analysis methods, and some of the results will be presented.

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