openmc.data.Evaporation

class openmc.data.Evaporation(theta, u)[source]

Evaporation spectrum represented as

\[f(E \rightarrow E') = \frac{E'}{I} e^{-E'/\theta(E)} \]

Parameters:

theta (openmc.data.Tabulated1D) – Tabulated function of incident neutron energy
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
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_ace(ace, idx=0)[source]

Create an evaporation spectrum from an ACE table

Parameters:

Returns:

Evaporation spectrum

Return type:

openmc.data.Evaporation

classmethod from_endf(file_obj, params)[source]

Generate 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:

Evaporation spectrum

Return type:

openmc.data.Evaporation

classmethod from_hdf5(group)[source]

Generate evaporation spectrum from HDF5 data

to_hdf5(group)[source]

Write distribution to an HDF5 group