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For the Single-Level Breit-Wigner (SLBW) formula, the peak resonant neutron cross section is related to the total width, $\Gamma = \Gamma_{(n)} + \Sigma_{r}\Gamma_{(r)}$, reported as GT in ENDF. For Reich-Moore (RM) resonance parameters format, however, there is no reported total resonance width (see for example: U-238(N,RES) interpreted resonance parameters.) For Reich-Moore format, then, is $\Gamma$ still equal to the sum of the partial widths (GG, GN, GFA, GFB), and if not, how does one calculate the peak neutron cross section from the given partial widths?

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The "Reich-Moore formalism" in ENDF-6 is actually not the "true" Reich-Moore formalism, some approximations were made in order to fit the restrictions of the format and to include 2 partial fission channels. Using this approximation you have indeed the Gtot=GN+GG+GFA+GFB.

You can find, or rather deduce, informations on this approximated-formalism in the ENDF-6 manual's appendix, but I acknowldge it should be written explicitely in the corresponding section.

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