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n [2009/08/06 15:39]
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n [2009/08/27 12:16] (current)
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 +**[//​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.

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