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.
N1 - Publisher Copyright:
© 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015. All rights reserved.
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
UR - http://www.scopus.com/inward/record.url?scp=85062021014&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85062021014
T3 - 12th International Topical Meeting on Nuclear Applications of Accelerators 2015, AccApp 2015
SP - 361
EP - 367
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
Y2 - 10 November 2015 through 13 November 2015
ER -