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IAEA1169 EMPIRE-II 2.18.

EMPIRE-II 2.18, Comprehensive Nuclear Model Code, Nucleons, Ions Induced Cross-Sections

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1. NAME OR DESIGNATION OF PROGRAM:  EMPIRE-2.18.
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2. COMPUTERS
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Program name Package id Status Status date
EMPIRE-II 2.18 IAEA1169/04 Tested 20-JUN-2003
EMPIRE-II 2.18 IAEA1169/06 Tested 16-SEP-2003

Machines used:

Package ID Orig. computer Test computer
IAEA1169/04 Linux-based PC Linux-based PC
IAEA1169/06 IBM PC IBM PC
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3. DESCRIPTION OF PROGRAM OR FUNCTION

EMPIRE-II is a flexible code for calculation of nuclear reactions in the frame of combined optical, Multistep Direct (TUL), Multistep Compound (NVWY) and  statistical (Hauser-Feshbach) models. Incident particle can be a nucleon or any nucleus(Heavy Ion). Isomer ratios, residue production cross sections  and emission spectra for neutrons, protons,alpha-particles, gamma-rays, and one type of Light Ion can be calculated. The energy range starts just above the resonance region for neutron induced reactions and extends up to several hundreds of MeV for the Heavy Ion induced reactions.
IAEA1169/06
This version corrects an error in the Absoft compile procedure.
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4. METHOD OF SOLUTION

For projectiles with A<5 EMPIRE calculates fusion cross section using spherical optical model transmission coefficients. In the case of Heavy Ion induced reactions the fusion cross section can be determined using various approaches including simplified coupled channels method (code CCFUS). Preequilibrium emission is treated in terms of quantum-mechanical theories (TUL-MSD and NVWY-MSC). MSC contribution to the gamma emission is taken into account. These calculations are followed by statistical decay  with arbitrary number of subsequent particle emissions.
Gamma-ray competition is considered in detail for every decaying compound nucleus.  Different options for level densities are available including dynamical approach with collective effects taken into account.
EMPIRE contains following third party codes converted into subroutines:
- SCAT2 by O. Bersillon
- ORION & TRISTAN by H. Lenske and H. Wolter
- CCFUS by C.H. Dasso and S. Landowne
- BARMOM by A. Sierk
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The code can be easily adjusted to the  problem by changing dimensions in the dimensions.h file. The actual limits are set by the available memory. In the current formulation up to 4 ejectiles plus gamma are allowed. This limit can be  relaxed by modification of a few lines in the input.f module. Gammas are not allowed in the incident channel. Angular distributions are calculated for the MSD part of the cross section. For the remaining mechanisms isotropy is assumed in the center-of-mass (c.m.) system. MSD can only be calculated for the inelastic scattering (not for the charge exchange reactions). No multiple preequilibrium is included. The preequilibrium emission of clusters is not considered.
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6. TYPICAL RUNNING TIME

The running times typically range from a few seconds to a few minutes per incident energy depending upon incident particle energy, mass range of the target, number of compound nuclei included, and the energy bin width that is used.
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7. UNUSUAL FEATURES OF THE PROGRAM

- spin dependent nuclear deformation affecting level densities and GDR shape,
- spin dependent fission barriers,
- cumulative plots of discrete levels,
- automatic retrieval of  experimental data from the EXFOR library,
- ENDF-VI formatting,
- plots comparing calculated and experimental (EXFOR) cross sections,
- graphic user interface in Tcl/Tk.
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8. RELATED AND AUXILIARY PROGRAMS

- EMPEND: Operates on the output of EMPIRE code to produce
   ENDF-VI-formatted cross section records (by A. Trkov).
- X4TOC4: converts retrieved EXFOR  entries into computational format
   (by R. Cullen).
- PLOTC4:  plots comparison between calculated and experimental data.

DATA LIBRARY:
- orsi.liv: Nuclear level energies, spins, parities, and
   gamma-ray branching ratios.
- nix-moller-audi.dat: ground-state masses, deformations and shell corrections
- ldp.dat: level density parameters, neutron resonance spacing (Dobs)
- nparac.dat: level density parameters from the analysis of shell model
   single-particle spacings
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9. STATUS
Package ID Status date Status
IAEA1169/04 20-JUN-2003 Tested at NEADB
IAEA1169/06 16-SEP-2003 Tested at NEADB
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10. REFERENCES

- M. Herman, R. Capote, B.V. Carlson, P. Oblozinsky, M. Sin, A. Trkov, H. Wienke and V. Zerkin, "EMPIRE: Nuclear Reaction Model Code System for Data
Evaluation", Nuclear Data Sheets, Vol. 108,  December 2007, Pages 2655-2715.
- M. Herman, "EMPIRE-II statistical model code for nuclear reaction calculations" in Proceedings of the "Workshop on Nuclear Reaction Data and Nuclear Reactors: Physics, Design and Safety" 13 March - 14 April 2000, ICTP, Trieste, Italy, to be published.
IAEA1169/04, included references:
- M. Herman:
EMPIRE-II Statistical Model Code for Nuclear Reaction Calculations
(Version 2.18 Mondovi) (27th September 2002)
IAEA1169/06, included references:
- M. Herman:
EMPIRE-II Statistical Model Code for Nuclear Reaction Calculations
(Version 2.18 Mondovi) (27th September 2002)
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11. MACHINE REQUIREMENTS

EMPIRE was initially developed on different platforms including PC, RISC6000, DEC-ALPHA and IRIX (Silicon Graphics). The current release runs on PC.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA1169/04 FORTRAN-77
IAEA1169/06 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The current version of the package runs under Linux Red Hat 6.1 using
g77 compiler. The full functionality requires: FORTRAN-77 or -90 compiler, C compiler (if not integrated with the FORTRAN compiler), gnuplot, grep, awk (or gawk), bash shell, and Tcl/Tk. All of these  can be obtained free of charge for practically any operating system (except of the bash shell available for UNIX only). Basic calculations should be possible on any operating system on which standard FORTRAN77 compiler is available.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

LINUX version (IAEA1169/04) developed by:
     Michal Wladyslaw HERMAN
     Nuclear Data Section
     IAEA
     Wagramerstrasse 5
     P.O. Box 100
     A-1400 VIENNA
     AUSTRIA

DOS version (IAEA1169/06), generated from the Linux version by:
     Gian Carlo PANINI
     for the NEA Data Bank
     12, Boulevard des Iles
     92130 Issy-Les-Moulineaux
     France
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16. MATERIAL AVAILABLE
IAEA1169/04
EXFOR database
RIPL2 database
EMPIRE_2_18.TGZ Compressed tar file
EU153DIR.TGZ
EU153PREQ.TGZ
HFBCS_LEV_DENS.TGZ   HF BCS level densities
ITCL_3_2_67_I386.RPM
SETUP_EMP  Installation procedures
TCL_8_3_3_67_I386.RPM
TIX_8_2_0B1_67_I386.RPM
TK_8_3_3_67_I386.RPM
X4_2_17.TGZ

IAEA1169/06
EXFOR database
RIPL2 database
README.NOW How to use
INPLIST.TXT Input instructions
ZVVIEW.TXT ZZVIEW install
CHANGE.LOG History of the code
HINTS.TXT FAQ on EMPIRE
\data   Parameter data
\doc Documentation
\dos  DOS procedures for compilation
\source   EMPIRE+ECIS source codes
\util  Utility codes
\work  Working directory
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: Hauser-Feshbach theory, compound nuclei, cross sections, decay spectra, emission spectra, gamma spectra, nuclear reactions, optical models.