10} Low-energy neutrons in FLUKA

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 Low-energy neutron transport is activated by option LOW-NEUT, but it is
 requested by defaults with most of the options available with the DEFAULTS
 command (CALORIMEtry, EET/TRANsmut, HADROTHErapy, ICARUS, NEUTRONS,
 NEW-DEFAults, PRECISIOn, SHIELDINg).  The only exception is the DEFAULTS
 option EM-CASCAde. However, command LOW-NEUT may be still necessary in
 order to give information about the cross section library used, or to issue
 special requests. The FLUKA traditional way for neutron transport below 20 MeV
 is a multi-group approach, which is fast, compact, and very reliable. It is
 particularly suited for shielding problems. This approach is inherently
 inclusive and it does not preserve correlations. Energy and momentum are
 conserved on average.

 However for some problems where the fine structure of the cross sections
 (resonances) must be explicitly treated, and/or correlations among products
 are important, the multigroup approach cannot be used.
 Starting with FLUKA2021.2 an alternative approach based on fully correlated
 continuous (pointwise) cross sections is available.

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