CCC-0696 LAHET 2.8.

LAHET 2.8

LAHET2.8 is typically used for transport calculation for nucleons and pions in the medium energy range within a complex geometry. Results estimated include particle fluxes, particle production, energy deposition, activation and material damage. LAHET may also be used to calculate differential particle production cross sections from the models included in the code.

Transport of particles includes Gaussian multiple Coulomb scattering with Gaussian range straggling for charged particles. Nuclear interactions are described by the intranuclear cascade/evaporation/fission model (Bertini or Isabel Inc. models) and nuclear elastic scattering is included for nucleon transport. The geometric description is that adapted from MCNP Version 3A. The transport of photons and low-energy neutrons produced in a LAHET calculation is accomplished by linking to MCNP Version 4B or 4C through a particle source file.

The recommended upper limit for nucleon transport is 3.5 GeV; for pions, it is 2.5 GeV. Higher energies are possible, but the interaction physics is problematic. Muons are transported without nuclear interaction. Hydrogen and helium ions are generally restricted to interactions below 1 GeV/amu. Complete utilization REQUIRES the installation of MCNP Version 4B or 4C and the associated cross section libraries. MCNP is not included in LAHET but is available as CCC-700/MCNP4C and DLC-200/MCNPDATA..

For realistic calculations, running times are typically a few hours to a few days, including an MCNP execution.

AUXILIARY PROGRAMS:

HCNV and TRX: Convert LAHET ASCII data to binary.

PRPR: Pre-processor for extracting various hardware versions.

RELATED DATA LIBRARIES:

Libraries specific to the LAHET Bertini model are included in a file called BERTIN. Gamma production cross sections from spallation products are included in a file called PHTLIB.

• R. E. Prael and H. Lichtenstein, "User Guide to LCS: The LAHET Code System," LA-UR-89-3014 (September 1989).

LAHET2.8 runs on either a CRAY or UNIX workstation. Machine specific patches are included for Unicos, SGI IRIX, IBM AIX, Sun Solaris, and HP-UX. LAHET does not run on personal computers.

LAHET2.8 requires a Fortran 77 compiler under a Unix operating system. LAHET 2.8 was tested at RSICC on the following machines:

SUN UltraSparc 60 under Sun OS 5.6 using f77 5.0

IBM 43P Model 260, running AIX 4.3. with XLF 6.1

HP B1000 under HP-UX B.10.20 using f77 V0.20

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Group X-5,
                Los Alamos National Laboratory,
                Los Alamos, New Mexico, U.S.A.