version has been updated several times due to new developments and
improvements of the model, partly suggested by the users. We apologize
for any incovenience. We wanted to make the modifications quickly
available, but we also did not want to create a large number of
releases. The version will probably be frozen soon. Please report
problems to [schmidt-erzhausen (at) t-online.de] and let us know your
suggestions! Further development of the code relies strongly on the
feedback from the users.
General description of fission observables. Released September 18, 2013, updated December 6, 2013.
(Even odd effect in fission-fragment neutron-number distribution revised.
Mass distribution at high excitation energies revised.
October 3, 2013: Angular momentum added as input parameter.
October 12, 2013: Calculation of prompt-neutron emission improved, some model parameters modified.
October 17, 2013: Problem causing incomplete output of covariance matrices solved. Physics not changed.
October 30, 2013: Output of pre-fission neutron and proton emission extended in tables and list-mode.
November 8, 2013: Modifed prompt-neutron emission due to shape fluctuations with energy dependence of shell effects.
November 8, 2013: List-mode output of energies and directions of post-scission neutrons.
November 10, 2013: Fission-gamma competition refined.
November 18 and 19, 2013: New global parameter set. Multi-chance fission modified.
November 20, 2013: Numerical instability corrected without change of the physics of the model.
November 29, 2013: Calculation of multi-chance fission corrected and modified.
December 4, 2013: Spurious even-odd effect in fission
probabilites due to even-odd effect in theoretical shell correction
Stand-alone version (Monte-Carlo method)
stand-alone version of the GEF code is written in FreeBASIC (a). The
FreeBASIC compiler produces binary code from the same source on Windows
(b) and on Linux. The executable uses the C library. For the Windows
version, a GUI is provided, written in JustBasic (c). The Windows
version runs also on Linux with Wine (d).
Quick start on Windows:
- Download the binaries (that includes some additional files).
- Start GEF.bat in a command window.
- Fill in the input mask of the graphical user interface and start the calculation.
- Output is written to file \out\... .dat.
Quick start on Linux:
- Download the binaries.
- Make sure that the binary file GEF is executable.
- Enter ./GEF in a command window.
- Answer the input dialogue.
- Output is written to file /out/... .dat.
Sample output plot:
Calculated prompt-neutron spectra:
Input mask of the graphical user interface:
For Windows and Linux
Readme file (Technical information, list of relevant publications)
EFNUDAT report (First comprehensive documentation)
Report JEFDOC 1423 (Updated documentation)
Source (for Windows and Linux)
Input files for extended input options
Distribution of entrance energies (example)
List of input parameters (example)
See Readme file for more detailed information.
Data tables in XML format (example)
List-mode file (example)
Raw data for the multi-variant distribution of fission-fragment yields from calculations with perturbed parameters (example)
See Reame file for more detailed information.
may consider using the Windows version of GEF on Linux with Wine in
order to profit from the more comfortable input handling offered by the
graphical user interface. This option may also solve problems of missing libraries under Linux.
Subroutine (Folding method)
The subroutine aims for being used
in combination with other nuclear-reaction codes. For a given
fissioning nucleus with excitation energy E* and angular momentum I it calculates a number of fission observables with the GEF model.
Technical description of the subroutine
(a) FreeBASIC is a free compiler (http://www.freebasic.net/).
(b) Windows is either a registered trademark or a trademark of
Microsoft Corporation in the United States and/or other countries.
(c) JustBasic is a free interpreter (http://www.justbasic.com/).
(d) Wine is a windows compatibility layer for Linux (http://www.winehq.org/).