Editing Input syntax manual (section)

=== therm and thermstoch (thermal scattering)<span id="therm"></span><span id="thermstoch"></span> ===

 '''therm''' ''NAME'' ''LIB'' 

 '''therm''' ''NAME'' ''TEMP'' ''LIB<sub>1</sub>'' ''LIB<sub>2</sub>'' 

 '''therm''' ''NAME'' 0 ''LIB<sub>1</sub>'' ''LIB<sub>2</sub>'' ''LIB<sub>3</sub>'' ... 

 '''thermstoch''' ''NAME'' ''TEMP'' ''LIB<sub>1</sub>'' ''LIB<sub>2</sub>'' 

Defines thermal scattering data that can be linked to nuclides using input entry '''moder''' in the [[#mat|material cards]]. Input values:

{|
| <tt>''NAME''</tt>
| : name of the thermal scattering data
|-
| <tt>''LIB<sub>i</sub>''</tt>
| : thermal scattering data identifiers as defined in the directory file (acelib)
|-
| <tt>''TEMP''</tt>
| : temperature to which the thermal scattering data is interpolated [in K]
|}

<u>Notes:</u>
* On-the-fly thermal motion sampling (TMS) temperature treatment:
**It requires the third value of the therm card to be set to "<tt>0</tt>"
**The thermal scattering data is automatically interpolated to the local temperature.
**The local temperature is either defined using:
*** the '''tms''' entry in the material card (see [[#mat|mat card]])
*** the multi-physics interface (see [[#ifc|ifc card]]), where the temperature limits are defined using the '''tft''' entry in the material card (see [[#mat|mat card]])
**The thermal scattering libraries <tt>''LIB<sub>i</sub>''</tt> must cover the whole range in which the materials appear in the geometry, i.e. data extrapolation is not supported.
*Interpolation:
**Thermal scattering data is interpolated using the methodology of makxsf code<ref name="makxsf">Brown, F. B. ''"The makxsf Code with Doppler Broadening"'', Los Alamos National Laboratory Tech. Rep., LA-UR-06-7002, Los Alamos, NM, [https://mcnp.lanl.gov/pdf_files/TechReport_2006_LANL_LA-UR-06-7002_Brown.pdf 2006]</ref>.
**Alternatively, the interpolation can be performed using the stochastic mixing approach with the '''thermstoch''' entry.
***This interpolation mode doesn't support on-the-fly interpolation.
*The continuous S(&alpha;, &beta;) formalism:
**It is available from version 2.1.32 on.
**The on-the-fly temperature treatment is available from version 2.2.0 and on.