Experimental s(a,ß) data for moderators with analysis of current evaluations

C. Wendorff; K. Ramic; E. Liu; Y. Danon

Experimental s(a,ß) data for moderators with analysis of current evaluations

C. Wendorff, K. Ramic, E. Liu, Y. Danon

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Scopus citations

Abstract

New thermal neutron scattering kernels were typically created using Molecular Dynamic simulations of the phonon spectrum that is then used to generate the scattering kernel. For verification and adjustment only microscopic total and inelastic scattering data were typically used. Because of this and due to model approximation the double differential scattering cross section (DDSCS) is not necessarily correct. Multiple experiments have been performed at the Spallation Neutron Source at Oak Ridge National Laboratory to measure the DDSCS of common and important neutron moderators including light water (H₂O), polyethylene (CH₂), and quartz (SiO₂). Using MCNP 6.1 and other tests, ENDF/B-VII.1 and other S(a,ß) libraries were compared with the experimental data. Differences between the experimental data and the DDSCS generated from the evaluation were found. Limitations on the modelling and creation of the S(a,ß) libraries are also discussed. The experimental data includes some of the highest energy-angle resolution data available for the DDSCS in the thermal region and sheds new light on possible problems in estimating the scattering kernel.

Original language	English
Title of host publication	12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015
Publisher	American Nuclear Society
Pages	361-367
Number of pages	7
ISBN (Electronic)	9781510842205
State	Published - 2015
Externally published	Yes
Event	12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015 - Washington, United States Duration: Nov 10 2015 → Nov 13 2015

Publication series

Name	12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015

Conference

Conference	12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015
Country/Territory	United States
City	Washington
Period	11/10/15 → 11/13/15

Funding

Research at Oak Ridge National Laboratory′s Spallation Neutron Source was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. A specific thank you is given to the instrument scientists of the ARCS and SEQUOIA machines for their continued assistance. Funding for this work has been provided by the DOE-NCSP.

Keywords

Experimental
Neutron
Thermal Scattering Law

Cite this

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title = "Experimental s(a,{\ss}) data for moderators with analysis of current evaluations",

abstract = "New thermal neutron scattering kernels were typically created using Molecular Dynamic simulations of the phonon spectrum that is then used to generate the scattering kernel. For verification and adjustment only microscopic total and inelastic scattering data were typically used. Because of this and due to model approximation the double differential scattering cross section (DDSCS) is not necessarily correct. Multiple experiments have been performed at the Spallation Neutron Source at Oak Ridge National Laboratory to measure the DDSCS of common and important neutron moderators including light water (H2O), polyethylene (CH2), and quartz (SiO2). Using MCNP 6.1 and other tests, ENDF/B-VII.1 and other S(a,{\ss}) libraries were compared with the experimental data. Differences between the experimental data and the DDSCS generated from the evaluation were found. Limitations on the modelling and creation of the S(a,{\ss}) libraries are also discussed. The experimental data includes some of the highest energy-angle resolution data available for the DDSCS in the thermal region and sheds new light on possible problems in estimating the scattering kernel.",

keywords = "Experimental, Neutron, Thermal Scattering Law",

author = "C. Wendorff and K. Ramic and E. Liu and Y. Danon",

note = "Publisher Copyright: {\textcopyright} 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015. All rights reserved.; 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015 ; Conference date: 10-11-2015 Through 13-11-2015",

year = "2015",

language = "English",

series = "12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015",

publisher = "American Nuclear Society",

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}

Wendorff, C, Ramic, K, Liu, E & Danon, Y 2015, Experimental s(a,ß) data for moderators with analysis of current evaluations. in 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015. 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015, American Nuclear Society, pp. 361-367, 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015, Washington, United States, 11/10/15.

Experimental s(a,ß) data for moderators with analysis of current evaluations. / Wendorff, C.; Ramic, K.; Liu, E. et al.
12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015. American Nuclear Society, 2015. p. 361-367 (12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Experimental s(a,ß) data for moderators with analysis of current evaluations

AU - Wendorff, C.

AU - Ramic, K.

AU - Liu, E.

AU - Danon, Y.

PY - 2015

Y1 - 2015

N2 - New thermal neutron scattering kernels were typically created using Molecular Dynamic simulations of the phonon spectrum that is then used to generate the scattering kernel. For verification and adjustment only microscopic total and inelastic scattering data were typically used. Because of this and due to model approximation the double differential scattering cross section (DDSCS) is not necessarily correct. Multiple experiments have been performed at the Spallation Neutron Source at Oak Ridge National Laboratory to measure the DDSCS of common and important neutron moderators including light water (H2O), polyethylene (CH2), and quartz (SiO2). Using MCNP 6.1 and other tests, ENDF/B-VII.1 and other S(a,ß) libraries were compared with the experimental data. Differences between the experimental data and the DDSCS generated from the evaluation were found. Limitations on the modelling and creation of the S(a,ß) libraries are also discussed. The experimental data includes some of the highest energy-angle resolution data available for the DDSCS in the thermal region and sheds new light on possible problems in estimating the scattering kernel.

AB - New thermal neutron scattering kernels were typically created using Molecular Dynamic simulations of the phonon spectrum that is then used to generate the scattering kernel. For verification and adjustment only microscopic total and inelastic scattering data were typically used. Because of this and due to model approximation the double differential scattering cross section (DDSCS) is not necessarily correct. Multiple experiments have been performed at the Spallation Neutron Source at Oak Ridge National Laboratory to measure the DDSCS of common and important neutron moderators including light water (H2O), polyethylene (CH2), and quartz (SiO2). Using MCNP 6.1 and other tests, ENDF/B-VII.1 and other S(a,ß) libraries were compared with the experimental data. Differences between the experimental data and the DDSCS generated from the evaluation were found. Limitations on the modelling and creation of the S(a,ß) libraries are also discussed. The experimental data includes some of the highest energy-angle resolution data available for the DDSCS in the thermal region and sheds new light on possible problems in estimating the scattering kernel.

KW - Experimental

KW - Neutron

KW - Thermal Scattering Law

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BT - 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015

PB - American Nuclear Society

T2 - 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015

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ER -

Experimental s(a,ß) data for moderators with analysis of current evaluations

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