NEA-1652 GEM.
GEM, Monte-Carlo Code for Simulating a Decaying Process of an Excited Nucleus
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHODS, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES, RELATED OR AUXILIARY PROGRAMS, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| GEM | NEA-1652/01 | Tested | 20-JUN-2003 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-1652/01 | Linux-based PC | Linux-based PC,PC Pentium 2GHz |
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3. DESCRIPTION OF PROGRAM OR FUNCTION
GEM is a Monte Carlo code which simulates a decaying process of an excited nucleus. GEM calculates the types, numbers, and kinetic energies of particles emitted from an excited nucleus. Input file which includes the mass, charge, excitation energy, kinetic energy and the direction of motion of the excited nuclei produced after cascade or preequilibrium stage, is needed for execution. In order to estimate cross sections of particle productions, output file needs to be edited.
GEM is a Monte Carlo code which simulates a decaying process of an excited nucleus. GEM calculates the types, numbers, and kinetic energies of particles emitted from an excited nucleus. Input file which includes the mass, charge, excitation energy, kinetic energy and the direction of motion of the excited nuclei produced after cascade or preequilibrium stage, is needed for execution. In order to estimate cross sections of particle productions, output file needs to be edited.
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4. METHODS
The code is based on the generalised evaporation model [1] and the Atchison fission model [F. Atchison, Jul-conf-34 KFA-Julich, Germany (1980)]. Type and kinetic energy of an emitted particle are randomly selected according to the probability distribution. A simulation continues as far as evaporation is energetically possible.
The code is based on the generalised evaporation model [1] and the Atchison fission model [F. Atchison, Jul-conf-34 KFA-Julich, Germany (1980)]. Type and kinetic energy of an emitted particle are randomly selected according to the probability distribution. A simulation continues as far as evaporation is energetically possible.
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10. REFERENCES
[1] S. Furihata, "Statistical analysis of light fragment production from medium energy proton-induced reactions", Nucl. Inst. Meth. in Phys. Res. B 171 (2000)251--258.
[2] S. Furihata, Proceedings of Monte Carlo 2000, Lisbon (2000) to be published by Springer Verlag.
[3] S. Furihata and H. Nakashima, "Analysis of activation yields by INC/GEM", JAERI-Conf 2001-006 (2001) 236.
[1] S. Furihata, "Statistical analysis of light fragment production from medium energy proton-induced reactions", Nucl. Inst. Meth. in Phys. Res. B 171 (2000)251--258.
[2] S. Furihata, Proceedings of Monte Carlo 2000, Lisbon (2000) to be published by Springer Verlag.
[3] S. Furihata and H. Nakashima, "Analysis of activation yields by INC/GEM", JAERI-Conf 2001-006 (2001) 236.
NEA-1652/01, included references:
- K. Niita, S-i. Meigo, Y. Ikeda, S. Furihata and F. Maekawa:The GEM Code - A Simulation program for the Evaporation and the Fission
Process of an Excited Nucleus
Jaeri-Data/Code 2001-015 (March 2001)
- S. Furihata:
The GEM code users manual
The Generalized Evaporation Model and the fission model for a Monte Carlo
simulation (September 5, 2001)
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
The excited energy of a residual nucleus produced after evaporation process is not written in an output file. To write this value in the output file, the following lines in 'main.f' should be modified. Add 'e1' in the write statements on line 165 and 187 (just before format statement 602 and 604), then the excitation energy of a residual nucleus can be obtained.
& write(70,602)izr,iar,erec,bet0,nocas,e1 <--
602 format(2i4,1pe13.5,3e13.5,i7,3h B )
& write(70,604)izr,iar,erec,bet0,nocas,e1 <--
604 format(2i4,1pe13.5,3e13.5,i7,3h D )
The excited energy of a residual nucleus produced after evaporation process is not written in an output file. To write this value in the output file, the following lines in 'main.f' should be modified. Add 'e1' in the write statements on line 165 and 187 (just before format statement 602 and 604), then the excitation energy of a residual nucleus can be obtained.
& write(70,602)izr,iar,erec,bet0,nocas,e1 <--
602 format(2i4,1pe13.5,3e13.5,i7,3h B )
& write(70,604)izr,iar,erec,bet0,nocas,e1 <--
604 format(2i4,1pe13.5,3e13.5,i7,3h D )
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NEA-1652/01
\for\*.f source files\data\level.tbl Data library
\data\mass.tbl Data library
\data\shell.tbl Data library
sample\in sample input file
sample\nucl.in sample input file
sample\sample.gem.out output file
GEM-abstract.txt Abstract of GEM
NEA_1652_1_V1.PDF documentation
NEA_1652_1_V2.PDF documentation
Keywords: Monte Carlo method, cascade, decay, nuclear models, preequilibrium, simulation.