International Conference on Nuclear Data for Science and Technology 2010
J. Korean Phys. Soc. 59, 1088-1091
Paper ID: ND-1341
DOI: 10.3938/jkps.59.1088
PACS: 25.40.-h, 24.10.-i
Evaluations of Neutron Data for T and 3He with R-Matrix Method
W. L. Sun1, Z. P. Chen2 and Y. F. Lin2
1 Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
2 Physics Department, Tsinghua University, Beijing 100084, China
Abstract
New evaluations for n+T and n+3He reactions are carried out by using our R-Matrix code RAC. The best R-Matrix parameters are obtained by fitting data of all necessary reactions simultaneously. The fitting for n+T reaction includes the available experimental data (E≤40MeV) from EXFOR database, corresponding to those of T(n,n)T, T(n,d)2n, 3He(p,p)3He, and 3He(p,2p)D+3He(p,2pn)p, while the fitting for n+3He reaction uses the data of 3He(n,n)3He, 3He(n,d)D, 3He(n,p)T, 3He(n,np)D+3He(n,2np)1H, 3He(n,g)4He, T(p,p)T, and T(p,n)3He. Then, these best R-Matrix parameters are applied to calculate the cross sections and their corresponding covariance matrices. The present evaluations agree well with the experimental data, and are obviously better than those of ENDF/B-VII, CENDL-2.1, or JENDL-3.3, particularly the cross sections for T(n,d)2n and 3He(n,np)D+3He(n,2np)p reactions.
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