Explicit treatment of thermal motion in continuous-energy Monte Carlo tracking routines

Tuomas Viitanen, Jaakko Leppänen

    Research output: Contribution to journalArticleScientificpeer-review

    77 Citations (Scopus)


    This paper introduces a new stochastic method for taking the effect of thermal motion into account on the fly in a Monte Carlo neutron transport calculation. The method is based on explicit treatment of the motion of target nuclei at collision sites and, consequently, requires simply cross sections at a temperature of 0 K regardless of the number of temperatures in the problem geometry. It utilizes rejection sampling techniques to manage the fact that total cross sections become distributed quantities. The method has a novel capability of accurately modeling continuous temperature distributions. The new stochastic method is verified using a simple test program, which compares its results to an analytical reference solution based on NJOY-broadened cross sections. Future implementation to Monte Carlo reactor physics code Serpent is also discussed shortly.
    Original languageEnglish
    Pages (from-to)165-173
    Number of pages9
    JournalNuclear Science and Engineering
    Issue number2
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed


    • Monte Carlo
    • on-the-fly
    • Doppler-broadening


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