IAEA1247 CEM95.
CEM95, Cascade Exciton Model Nuclear Reactions by Monte-Carlo Method
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, 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 |
|---|---|---|---|
| CEM95 | IAEA1247/01 | Tested | 21-APR-1995 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| IAEA1247/01 | Many Computers | Many Computers |
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3. DESCRIPTION OF PROGRAM OR FUNCTION
The code CEM95 is intended for the Monte Carlo calculation of nuclear reactions in the framework of the Cascade-Exciton Model (CEM) of nuclear reactions. The CEM assumes that reactions occur in three stages. The first stage is the intranuclear cascade. The excited residual nucleus formed after the emission of cascade particles determines the particle-hole configuration that is a starting point for the second preequilibrium stage of the reaction. The subsequent relaxation of the nuclear excitation is treated in terms of the exciton model of preequilibrium decay which includes the description of the equilibrium evaporative stage of the reaction.
The code CEM95 is intended for the Monte Carlo calculation of nuclear reactions in the framework of the Cascade-Exciton Model (CEM) of nuclear reactions. The CEM assumes that reactions occur in three stages. The first stage is the intranuclear cascade. The excited residual nucleus formed after the emission of cascade particles determines the particle-hole configuration that is a starting point for the second preequilibrium stage of the reaction. The subsequent relaxation of the nuclear excitation is treated in terms of the exciton model of preequilibrium decay which includes the description of the equilibrium evaporative stage of the reaction.
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6. TYPICAL RUNNING TIME
It depends on the concrete characteristics to be calculated: 5 min may be enough to calculate fission cross section at a given energy; tens of ours may be needed to calculate with a good statistics double differential cross sections at backward angles and high energy of ejectiles.
It depends on the concrete characteristics to be calculated: 5 min may be enough to calculate fission cross section at a given energy; tens of ours may be needed to calculate with a good statistics double differential cross sections at backward angles and high energy of ejectiles.
IAEA1247/01
NEA-DB ran the test cases included in this package on both a DEC/VAX 6000 machine and a PC/80486 (66 MHz) microcomputer. The following table summarizes the execution times found:VAX PC
Test 1 26min 45min
Test 2 1h45min 2h40min
Test 3a 2min 2min
Test 3b 4h36min 7h40min
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7. UNUSUAL FEATURES OF THE PROGRAM
The CEM95 code is intended for calculation of reaction, elastic, fission and total cross sections; excitation functions; nuclide yields, energy and angular spectra; double differential cross sections; mean multiplicities, i.e., number of ejectiles per incident bombarding particle; ejectile yields; mean energies and production cross sections for neutrons, protons, deuterons, tritons, He3, He4, pions-, pions0, and pions+ emitted in nucleon- and pion-induced reactions using the Cascade-Exciton Model (CEM) of Nuclear Reactions. A detailed description of the CEM may be found in Ref.1. Part of primary version of the code concerning the preequilibrium and equilibrium stages of reactions is published in Ref.2. The Dubna version of the intranuclear cascade model used in the CEM95 is described in detail in the monograph 3. A detailed description of the subroutines used at the cascade stage of reaction may be found in Ref.4. All the models incorporated in the CEM95 for description of the level density parameter are given in Ref.5. All the models incorporated in the CEM95 to take into account competition between particle emission and fission at the compound stage of the reactions are described in Ref.6. Exemplary results obtained with the code CEM95 may be found in Refs.7,8.
The CEM95 code is intended for calculation of reaction, elastic, fission and total cross sections; excitation functions; nuclide yields, energy and angular spectra; double differential cross sections; mean multiplicities, i.e., number of ejectiles per incident bombarding particle; ejectile yields; mean energies and production cross sections for neutrons, protons, deuterons, tritons, He3, He4, pions-, pions0, and pions+ emitted in nucleon- and pion-induced reactions using the Cascade-Exciton Model (CEM) of Nuclear Reactions. A detailed description of the CEM may be found in Ref.1. Part of primary version of the code concerning the preequilibrium and equilibrium stages of reactions is published in Ref.2. The Dubna version of the intranuclear cascade model used in the CEM95 is described in detail in the monograph 3. A detailed description of the subroutines used at the cascade stage of reaction may be found in Ref.4. All the models incorporated in the CEM95 for description of the level density parameter are given in Ref.5. All the models incorporated in the CEM95 to take into account competition between particle emission and fission at the compound stage of the reactions are described in Ref.6. Exemplary results obtained with the code CEM95 may be found in Refs.7,8.
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10. REFERENCES
- 2) S.G. Mashnik, V.D. Toneev:
"MODEX - the Program for Calculation of the Energy Spectra of
Particles Emitted in the Reactions of Pre-Equilibrium and
Equilibrium Statistical Decays", Communications of the Joint
Institute for Nuclear Research, P4-8417, Dubna, 1974
(FORTRAN66, text - in Russian).
- 3) V.S. Barashenkov, V.D. Toneev:
"Interaction of High Energy Particles and Nuclei with Atomic
Nuclei", Moscow, "Atomizdat', 1972 (in Russian).
- 4) F.G. Geregi et al.:
"Calculation of Cross-Sections for Photonuclear Reactions",
Kishinev, Kishinev State University, 1990 (in Russian).
- 7) S.G. Mashnik:
Nucl. Phys. A568(1994)703.
- 8) S.G. Mashnik, S.A. Smolyansky:
"The Cascade-Exciton Approach to Nuclear Reactions (Foundation
and Achievements)", JINR Preprint E2-94-353, Dubna, 1994.
- 2) S.G. Mashnik, V.D. Toneev:
"MODEX - the Program for Calculation of the Energy Spectra of
Particles Emitted in the Reactions of Pre-Equilibrium and
Equilibrium Statistical Decays", Communications of the Joint
Institute for Nuclear Research, P4-8417, Dubna, 1974
(FORTRAN66, text - in Russian).
- 3) V.S. Barashenkov, V.D. Toneev:
"Interaction of High Energy Particles and Nuclei with Atomic
Nuclei", Moscow, "Atomizdat', 1972 (in Russian).
- 4) F.G. Geregi et al.:
"Calculation of Cross-Sections for Photonuclear Reactions",
Kishinev, Kishinev State University, 1990 (in Russian).
- 7) S.G. Mashnik:
Nucl. Phys. A568(1994)703.
- 8) S.G. Mashnik, S.A. Smolyansky:
"The Cascade-Exciton Approach to Nuclear Reactions (Foundation
and Achievements)", JINR Preprint E2-94-353, Dubna, 1994.
IAEA1247/01, included references:
- S. Mashnick:User Manual for the Code CEM95 (1995)
- 1) K.K. Gudima et al.:
Cascade-Exciton Model of Nuclear Reactions
Nucl. Phys. A401(1983)329
- 5) S.G. Mashnik:
Statistical Model Calculations of Nuclear Level Density with
Different Systematics for the Level Density Parameter
Acta Phys. Slov. 43(1993), No.2, 86-107
- 6) S.G. Mashnik:
Optimal Systematics of Single-Humped Fission Barriers
for Statistical Calculations
Acta Phys. Slov. 43(1993), No.4, 243-270
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IAEA1247/01
The program was installed and run by NEA-DB both on a DEC/VAX 6000-510 computer and a DELL 466/L PC/80486 with 66 MHz and 12 MBytes of RAM.[ top ]
IAEA1247/01
The implementation on VAX was done under VMS V.6.1 and using the VAX FORTRAN compiler version 6.2. The implementation on the PC was done under MS-DOS V.6.20; and the source was compiled with the Microsoft Fortran compiler Version 5.1.[ top ]
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IAEA1247/01
| File name | File description | Records |
|---|---|---|
| IAEA1247_01.001 | Information file | 101 |
| IAEA1247_01.002 | CEM95 Manual in LaTex format | 3966 |
| IAEA1247_01.003 | Fortran source 1 | 2007 |
| IAEA1247_01.004 | Fortran source 2 | 675 |
| IAEA1247_01.005 | Fortran source 3 | 2990 |
| IAEA1247_01.006 | CEM95 executable for PC (MS Fortran) | 0 |
| IAEA1247_01.007 | Input Test 1 | 6 |
| IAEA1247_01.008 | Input Test 2 | 6 |
| IAEA1247_01.009 | Input Test 3a | 6 |
| IAEA1247_01.010 | Input Test 3b | 6 |
| IAEA1247_01.011 | Author's output of Test 1 (with PC) | 213 |
| IAEA1247_01.012 | Author's output of Test 2 (with PC) | 103 |
| IAEA1247_01.013 | Author's output of Test 3 (with PC) | 1017 |
| IAEA1247_01.014 | Data Bank's output of Test 1 (with VAX) | 640 |
| IAEA1247_01.015 | Data Bank's output of Test 2 (with VAX) | 1855 |
| IAEA1247_01.016 | Data Bank's output of Test 3a (with VAX) | 1341 |
| IAEA1247_01.017 | Data Bank's output of Test 3b (with VAX) | 1341 |
| IAEA1247_01.018 | Data Bank's output of Test 1 (with PC) | 640 |
| IAEA1247_01.019 | Data Bank's output of Test 2 (with PC) | 1855 |
| IAEA1247_01.020 | Data Bank's output of Test 3a (with PC) | 1341 |
| IAEA1247_01.021 | Data Bank's output of Test 3b (with PC) | 1341 |
| IAEA1247_01.022 | DOS file-names | 21 |
Keywords: evaporation model, high-energy reactions, nuclear cascades, nuclear models.