Home / Store / Journals / Electronic Articles / Nuclear Science and Engineering / Volume 110 / Number 2
Mihailo I. Marković, Djordje M. Minć, Aleksandar D. Rakić
Nuclear Science and Engineering
Volume 110 / Number 2 / February 1992 / Pages 157-164
Format:electronic copy (download)
Exactly describing the time of thermal neutron collisions with water molecules, orientation averaging is performed by an exact method (EOAK) and four approximate methods (two well known and two less known). Expressions for the microscopic scattering kernel are developed. The two well-known approximate orientation averaging methods are Krieger-Nelkin (K-N) and Koppel-Young (K-Y). The results obtained by one of the two proposed approximate orientation averaging methods agree best with the corresponding results obtained by EOAK. The largest discrepancies between the EOAK results and the results of the approximate methods are obtained using the well-known K-N approximate orientation averaging method.
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