Web of Conferences
Open Access
Issue ND 2007
2007
Article Number 325
Number of page(s) 6
Section Standard cross sections
DOI http://dx.doi.org/10.1051/ndata:07139
Published online 17 June 2008

International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07139

An international neutron cross section standards evaluation

Allan Carlson1, Sergey Badikov2, Chen Zhenpeng3, Evgenij Gai2, Gerald Hale4, Franz-Josef Hambsch5, Hartmut Hofmann6, Toshihiko Kawano4, Nancy Larson7, Soo-Youl Oh8, Vladimir Pronyaev2, Donald Smith9, Siegfried Tagesen10 and Herbert Vonach10

1  National Institute of Standards & Technology, 100 Bureau Dr. MS 8463, Gaithersburg, MD 20899-8463, USA
2  Institute of Physics & Power Engineering, Bondarenko sq. 1, 249033 Obninsk, Kaluga Region, Russia
3  Tsinghua University, Beijing 100084, China
4  Los Alamos National Laboratory, T-2, MS B-243, Los Alamos, NM 87545, USA
5  Institute for Reference Materials and Measurements, Retieseweg 111, 2440 Geel, Belgium
6  Erlangen-Nuernberg University, Staudtstrasse 7, 91058 Erlangen, Germany
7  Oak Ridge National Laboratory, Bldg. 5700, MS 6171, P.O. Box 2008, Oak Ridge, TN 37831-6171, USA
8  Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600, Republic of Korea
9  Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA
10  Vienna University, Waehringerstrasse 17, 1090 Vienna, Austria

carlson@nist.gov

Published online: 21 May 2008

Abstract
A new evaluation of the neutron cross section standards was recently completed. The results of this work became the standards for the new ENDF/B-VII library. This evaluation was performed to include new experiments on the standards that have been made since the ENDF/B-VI standards evaluation was completed and to improve the evaluation process. The evaluations include the H(n,n), 6Li(n,t), 10B(n,α), 10B(n,α1γ), 197Au(n,γ), 235U(n,f), and 238U(n,f) standard reactions. Evaluations were not done for the 3He(n,p) and C(n,n) standards which were carried over from ENDF/B-VI. The need for standards above 20 MeV led to the extension of the 235U(n,f) and 238U(n,f) cross sections to 200 MeV. In addition evaluations were produced for the non-standard 238U(n,γ) and 239Pu(n,f) reactions. Results of this work and comparisons with previous evaluations are presented.



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