Options for low energy neutrons
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The following parameters are used for neutrons with energies less than 20 MeV. 

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.. list-table:: **emcnf**
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   * - Value
     - Explanation
   * -  | (D=0.0)
     -  | Threshold energy for neutron capture [MeV]:
        | implicit capture is considered above this energy;  analog capture is considered below this energy.
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.. list-table:: **nonu**
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   * - Value
     - Explanation
   * -  | (D=1)
     -  | Options for fission neutrons
   * -  | =0
     -  | Turn off fission: fission is treated as simple capture.
   * -  | =1
     -  | Normal fission producing neutrons.
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.. list-table:: **isaba**
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   * - Value
     - Explanation
   * -  | (D=0)
     -  | Option for  :math:`S(\alpha,\beta)` .
   * -  | =0
     -  | No interpolation.
   * -  | =1
     -  | Perform interpolation of the data of  :math:`S(\alpha,\beta)` ,  which should be specified for calculations with  thin targets in which particle scattering rarely occurs.
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.. list-table:: **isans**
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   * - Value
     - Explanation
   * -  | (D=0)
     -  | Option for small angle neutron scattering (SANS) in thermal neutron  scattering library.
   * -  | =0
     -  | No SANS model.
   * -  | =1
     -  | Activates the SANS model included in the thermal scattering file.  Requires a special thermal scattering file with the SANS parameters.