openmc.data.GeneralEvaporation

class openmc.data.GeneralEvaporation(theta, g, u)[source]

General evaporation spectrum given in ENDF MF=5, LF=5 represented as

\[f(E \rightarrow E') = g(E'/\theta(E)) \]
Parameters:
  • theta (openmc.data.Tabulated1D) – Tabulated function of incident neutron energy \(E\)
  • g (openmc.data.Tabulated1D) – Tabulated function of \(x = E'/\theta(E)\)
  • u (float) – Constant introduced to define the proper upper limit for the final particle energy such that \(0 \le E' \le E - U\)
Variables:
  • theta (openmc.data.Tabulated1D) – Tabulated function of incident neutron energy \(E\)
  • g (openmc.data.Tabulated1D) – Tabulated function of \(x = E'/\theta(E)\)
  • u (float) – Constant introduced to define the proper upper limit for the final particle energy such that \(0 \le E' \le E - U\)
classmethod from_endf(file_obj, params)[source]

Generate general evaporation spectrum from an ENDF evaluation

Parameters:
  • file_obj (file-like object) – ENDF file positioned at the start of a section for an energy distribution.
  • params (list) – List of parameters at the start of the energy distribution that includes the LF value indicating what type of energy distribution is present.
Returns:

General evaporation spectrum

Return type:

openmc.data.GeneralEvaporation