RSICC CODE PACKAGE PSR-532
1. NAME AND TITLE
CEM03.01: Monte-Carlo Code System to Calculate Nuclear Reactions in the Framework of the Improved Cascade-Exciton Model.
2. CONTRIBUTORS
Los Alamos National Laboratory, Los Alamos, New Mexico.
3. CODING LANGUAGE AND COMPUTER
Fortran 77; Sun and PC (P00532MNYCP00).
4. NATURE OF PROBLEM SOLVED
CEM03.01 is the latest in a series of codes including CEM2k+GEM2, CEM97, and CEM95. It is an extended and improved version of the earlier codes, which implement versions of the Cascade-Exciton Model (CEM) of nuclear reactions. CEM03.01 considers IntraNuclear Cascade (INC), preequilibrium, evaporation, fission, and Fermi Break-up mechanisms of nuclear reactions as well as coalescence of complex particles up to 4He from fast INC nucleons. CEM03.01 calculates total reaction and fission cross-sections, nuclear fissilities, excitation functions, nuclide distributions (yields) of all produced isotopes separately as well as their A- and Z-distributions, energy and angular spectra, double-differential cross-sections, mean multiplicities, i.e. the number of ejectiles per inelastic interaction of the projectile with the target, ejectile yields and their mean energies for n, p, d, t, 3He, 4He, π+, π-, and π0. By modifying an input variable, evaporation of as many as 60 isotopes heavier than 4He (up to 28Mg) may also be modeled. In addition, CEM03.01 provides in its output separately the yields of Forward (F) and Backward (B) produced isotopes, their mean kinetic energies, A- and Z-distributions of the mean emission angle, their parallel velocities, and the F/B ratio of all products in the laboratory system, distributions of the mean angle between two fission fragments, of neutron multiplicity, of the excitation energy, of momentum and angular momentum, and of mass and charge numbers of residual nuclei after the INC and preequilibrium stages of reactions, as well as for fissioning nuclei before and after fission. CEM03.01 calculates reactions induced by nucleons, pions, bremsstrahlung and monochromatic photons on not too light targets at incident energies from ~10 MeV (~30 MeV, in the case of γ + A) up to several GeV.
5. METHOD OF SOLUTION
Monte-Carlo simulation method.
6. RESTRICTIONS OR LIMITATIONS
None noted.
7. TYPICAL RUNNING TIME
Running times vary considerably. The test cases ran in less than 5 minutes on a Pentium 4 3.40 GHz computer.
8. COMPUTER HARDWARE REQUIREMENTS
CEM03.01 runs on Sun workstations and Pentium computers.
9. COMPUTER SOFTWARE REQUIREMENTS
CEM03.01 has been tested under Unix, Windows, and Linux operating systems. The Windows distribution includes an executable created by the code developer with Compaq Visual Fortran Professional Edition 6.6.0 under WindowsXP. This executable also runs under Windows 2000 SP4. The PC Windows version was compiled at RSICC with Intel 9.0 under WindowsXP and with CVF 6.6B under Windows2000.
RSICC tested the Unix version on a Sun workstation running Solaris 9 with the Sun WorkShop 6 update 1 Fortran 77 compiler. RSICC compiled and ran test cases on an AMD Opteron under RedHat Enterprise Linux 4 (2.6.9-22.ELsmp) with The Portland Group, Inc. pgf77 6.0-5 32-bit compiler. This executable is included in the package. Use of a 64-bit computer and a 64-bit compiler will give the closest reproduction of the test cases included with the distribution.
10. REFERENCES
Stepan Mashnik, Konstantin Gudima, Arnold Sierk, Mircea Baznat, and Nikolai Mokhov, “CEM03.01 User Manual,” Los Alamos National Laboratory Report LA-UR-05-7321 (2005).
11. CONTENTS OF CODE PACKAGE
The package is transmitted on a CD which includes the report cited above and a GNU compressed tar file which contains the CEM03.01 Fortran source files, a Linux executable, a Windows executable, data files, and test case input and output.
12. DATE OF ABSTRACT
March 2006.
KEYWORDS: NUCLEAR MODELS; MONTE CARLO; EVAPORATION; INC; PREEQUILIBRIUM; FISSION; FERMI BREAK-UP; COALESCENCE.