Configure Menu

The Configure menu provides options for controlling the R-matrix formalism, debug output, file directories, and runtime behavior.

Formalism

The Formalism submenu allows choosing between two equivalent R-matrix formalisms:

A-Matrix (default) – a level matrix formulation. Preferred when there are many channels and few levels.
R-Matrix – a channel matrix formulation. Preferred when there are many levels and few channels.

Both formalisms produce identical results; the choice is purely one of computational efficiency.

Check Files

Selecting Checks… opens a dialog to control diagnostic output. AZURE2 can write detailed check files for debugging and verification. Each check file can be set independently to one of three modes:

None	No output (default). Fastest execution.
Screen	Print the check file contents to the terminal.
File	Write to files with predefined names in the checks directory.

Warning

Writing check files can drastically increase computation time. Keep them set to None unless debugging.

The check file directory is specified under Directories (see below).

Directories

Selecting Directories… opens a dialog where you can set:

Output Directory – where AZURE2 writes result files (cross sections, parameters, chi-squared, reaction rates, etc.).
Checks Directory – where debug check files are written.

Paths may be either absolute or relative to the Input file directory. These directories must exist before running a calculation – AZURE2 will not create them automatically.

If no directories are specified, output files are written to the same directory as the Input file.

Runtime Options

Selecting Runtime Options… opens a dialog with the following settings:

Option	Description
Use GSL Coulomb functions	Use the GNU Scientific Library routines for Coulomb function calculations. Faster but potentially less accurate than the default method of N. Michel, Computer Physics Communications 176, 232 (2007).
Use Brune formalism	Use the Brune parameterization for R-matrix parameters (C.R. Brune, Physical Review C 66, 044611, 2002). Recommended and enabled by default. More numerically stable than the classical approach.
Ignore external width if internal width is zeroed	When enabled, the external gamma-ray width of a level is set to zero if no total gamma-ray width is specified.
Use RMC capture formalism	Enable the Reich-Moore capture formalism. Currently only supported for (n, gamma) reactions. Do not use for other reaction types.
Do not perform parameter transformations	Input R-matrix formal widths and pole energies directly, without transforming from physical parameters. Useful when starting from an older calculation. Note that formal parameters are radius and boundary-condition dependent.
Use Wigner limits for parameter limits	Automatically apply Wigner limit bounds on fit parameters.
Use Hybrid Coulomb method	Use a hybrid method for Coulomb function calculations that includes a nuclear potential (Woods-Saxon or Gaussian). Enables the Nuclear Potential tab.

Note

The Brune formalism and RMC capture formalism are mutually exclusive. Enabling one will automatically disable the other.

Note

When running AZURE2 from the command line (--no-gui), these runtime options are not applied from the saved configuration. They must be specified as command-line flags each time. See Command-Line Usage.