A Fast Nuclear Section Doppler Broadening Method
A Doppler broadening and cross-section technology, which is used in the field of continuous energy neutron cross-section adjustment according to temperature changes in Monte Carlo neutron transport calculations, can solve problems such as reducing the efficiency of the method, and achieve accurate multi-temperature cross-section calculation, reducing The effect of time consumption and data accuracy reduction
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[0059] The present invention selects the typical nuclide in a certain material 238 U Doppler broadening from 0K section to 600K section is used as an application example. For nuclide treatment of other materials, please refer to this treatment process.
[0060] (1) Acquisition of the pole value corresponding to the 0K section:
[0061] a) According to the content in Document 2 and Document 3 in ENDF / B-VII.1 evaluation library, get the section and resonance parameters.
[0062] b) Calculate the poles of each reaction according to formula 2 and the parameters of spin S, orbital angular momentum l and magnetic quantum number M in the ENDF / B-VII.1 evaluation library. In this example, 11520 poles are calculated, and the poles stored as a hash.
[0063] (2) Fast Doppler broadening calculation to obtain the nuclear cross section at 600K:
[0064] a) Take out the pole, and express the Doppler broadening as a pole according to formulas 5 and 6;
[0065] b) According to the number ...
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