RSICC CODE PACKAGE PSR-550

 

1.  NAME AND TITLE

ALICE2008:

Statistical Model Code System to Calculate Particle Spectra from HMS Precompound Nucleus Decay.

 

2.  CONTRIBUTORS

Lawrence Livermore National Laboratory, Livermore, California,

Institut f. Reaktorsicherheit, Forschungszentrum Karlsruhe, FRG,

Los Alamos National Laboratory, Los Alamos, New Mexico,

Institute of Physics and Power Engineering, Obninsk, Russia,

Through the OECD NEA Data Bank, Issy-les-Moulineaux, France.

 

3.  CODING LANGUAGE AND COMPUTER

FORTRAN; PC and Mac. RSICC ID: P00550PC58600; NEADB ID: USCD1238/01.

 

4.  NATURE OF PROBLEM SOLVED

The HMS-Alice (Hybrid Monte-carlo Simulation) codes began evolution from the Alice code in 1995 with the development of the Monte Carlo precompound model. This new release designated HMS-ALICE2008 uses the HMS precompound decay model, the Weisskopf- Ewing evaporation model (optional with s-wave approximation) and Bohr- Wheeler fission models, all with multiple particle emission cascades, to estimate single and double differential emission spectra and product yields of nuclear reactions induced by probes from photons to heavy ions. Initial excitations up to 980 MeV should be tolerated, but a range of 0.2-250 MeV is advised as pion production channels have not yet been programmed into the physics. Product yields include A,Z of fission products. An option exists to give output of exclusive particle emission spectra of up to multiplicity 3.

 

5.  METHOD OF SOLUTION

The models listed above are evaluated using Monte-Carlo methods with an energy histogram for emission spectra/ residual excitations where the mesh size is an input option. The angular distributions are based on the linear momentum conservation model of Chadwick and Oblozinsky. Natural isotopic targets may be specified. Cluster exit channels are an option.

 

6.  RESTRICTIONS OR LIMITATIONS

HMS-Alice (2008) has been written for ease of use via an interactive interrogating screen default input option, which offers master user choice or author defaults of calculation details/ methods (e.g. level densities, energy mesh, output types, etc.). It outputs useable input files to hard drive which may be used, or edited and used by option to bypass the interactive input process.

 

7.  TYPICAL RUNNING TIME

Sample problems ran in approximately 15 seconds. Time depends on number of Monte-Carlo events per incident energy, number of incident energies, excitation energies.

 

8.  COMPUTER HARDWARE REQUIREMENTS

ALICE2008 runs on PC or Mac and consumes approximately 12MB of disk space.

 

 

9.  COMPUTER SOFTWARE REQUIREMENTS

The code runs on PC under Windows or Linux and on Mac computers. A Fortran 95 compiler is required on all systems as no executables are distributed.

 

10. REFERENCES

10.a included in documentation:

M.Blann, A.Y. Konobeev, W.B. Wilson, and S.G. Mashnik, “Manual for Code Alice Version July 7, 2008” (July 27, 2008).

M.Blann, W.G. Wilson, S.G. Mashnik, and A.Y. Konobeev, “Summary of Capabilities of Monte-Carlo HMSALICE Code Post-1996” (September 17, 2008).

M. Blann and A.Y. Konobeev, “Precompound Cluster Decay in HMSAlice” (September 22, 2008).

10.b special acknowledgement

A.V. Ignatyuk, V.P. Lunev, and Yu.N. Shubin from the Institute of Physics and Power Engineering, Obninsk.

 

11. CONTENTS OF CODE PACKAGE

The package is transmitted on a CD-R in a Unix tar file, which contains the documents referenced above, source code, and example problems. Windows users may extract with WinZIP.

 

12. DATE OF ABSTRACT

October 2009.

 

KEYWORDS:   NUCLEAR MODELS; WORKSTATION; MICROCOMPUTER