Module parser 

ENDF-6 File 2 resonance parameter, File 3 cross section and File 32 covariance parser.

Parses the fixed-width 80-character ENDF-6 format to extract resolved resonance region (RRR) parameters.

ENDF-6 Line Format

Each line is exactly 80 characters:

• Cols 1-11: Field 1 (floating point or integer)
• Cols 12-22: Field 2
• Cols 23-33: Field 3
• Cols 34-44: Field 4
• Cols 45-55: Field 5
• Cols 56-66: Field 6
• Cols 67-70: MAT number
• Cols 71-72: MF (file number)
• Cols 73-75: MT (section number)
• Cols 76-80: Line sequence

SAMMY Reference

• SAMMY manual Section 9 (ENDF-6 format)
• SAMMY source: sammy/src/endf/ module

Enums

EndfParseError

Errors from ENDF parsing.

Functions

parse_endf_file2

Parse ENDF-6 File 2 resonance parameters, and File 3’s cross sections when the text holds them, from raw ENDF text.

parse_resonance_covariance

The covariance, from File 32 (MT=151), of the energy, neutron width and capture width of each resonance of data with an energy in window_ev that File 32 lists with the same spin and an energy and widths that agree to a relative 1e-5. A resonance listed in several short-range sections has their contributions summed; resonances outside the window, or that File 32 does not list, are left out. None when the text has no File 32 or it lists no resonance in the window.