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====== n ======
**[//neutron_data//]**
Signals the use of neutron atomic scattering lengths.Scattering lengths for isotopes can be used by placing the isotope name after “//occ//” as in:
occ 6Li 1
occ 36Ar 1
The scattering lengths data, contained in the file NEUTSCAT.CPP, is from
www.ccp14.ac.uk/ccp/web-mirrors/neutrons/n-scatter/n-lengths/LIST~1.HTM
Constant wavelength neutron diffraction requires a Lorentz correction using the Lorentz_Factor macro (defined in TOPAS.INC); it is defined as follows:
scale_pks = 1 / (Sin(Th)^2 Cos(Th));
**[//no_LIMIT_warnings//]**
Surpresses [[#k157|LIMIT_MIN]] and LIMIT_MAX warning messages.
**[//normalize_FCs//]**
If defined then site fractional coordinates are normalized. Normalization of a particular fractional coordinate does not occur if it has //min/////max// limits, is part of a //rigid// body or part of a site constraint of any kind.
**[//numerical_area// E]**
Returns the numerically calculated area under the phase.