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Some materials in both old and new libraries use the MLBW
representation because the interference effects are too
strong for the simpler SLBW representation. MLBW has the
advantage of always being positive definite also. However,
- it doesn't handle materials with multi-channel effects,
- it is much more expensive to process than SLBW,
- it doesn't lend itself to analytic Doppler broadening, and
- it doesn't work well using analytic reactor physics methods.
The multi-level Breit-Wigner parameters use the same format
in File 2 as the SLBW representation.
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