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PSR-0248 ABAREX.

ABAREX, Optical Statistical Model Neutron Cross-Sections Using ABACUS and NEARREX

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1. NAME OR DESIGNATION OF PROGRAM

ABAREX and Elemental ABAREX.

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2. COMPUTERS
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Program name Package id Status Status date
ABAREX PSR-0248/04 Tested 24-NOV-2000

Machines used:

Package ID Orig. computer Test computer
PSR-0248/04 IBM PC,VAX under VMS,DEC ALPHA W.S.,RISC 6000 PC Pentium III 500,IBM RISC6000 WS
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3. DESCRIPTION OF PROGRAM OR FUNCTION

ABAREX is an optical- statistical model program developed for the calculation and fitting of energy-averaged neutron cross sections. These include:

 

  1. Total cross sections

  2. Absorption cross sections

  3. s and p wave strength functions

  4. Integrated and differential shape-elastic cross sections

  5. Integrated and differential compound-elastic cross sections

  6. Integrated and differential elastic cross section

  7. Integrated and differential inelastic cross sections for the excitation of discrete levels.

  8. Integrated inelastic-scattering cross sections for the excitation of continuum levels.

  9. Gamma-ray production cross sections

  10. Radiactive-capture cross sections

  11. Fission and other reaction cross sections for which transmission coefficients can be supplied.

 

The package includes two code systems:

  1. isotopic ABAREX, which was revised in the June 1999 update, and

  2. elemental ABAREX, which was added to the package in the June 1999 update.

The modifications to the 1999 release of the isotopic ABAREX code were made to accomodate some European fortran compilers and will not change results from the previous 1998 release. ELEMENTAL ABAREX is an extension of ABAREX, designed for the interpretation of neutron interactions with elemental targets consisting of up to ten isotopes. The contributions from each of the isotopes of the element are explicitly dealt with and combined for comparison with the elemental observers.

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4. METHODS

The spherical-optical model algorithm of ABACUS and the statistical method of NEARREX are used with numerous modifications and improvements.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The program is limited to:

  1. neutron induced processes,

  2. a maximum of 50 discrete levels, and

  3. incident energies of <50 MeV approx.

The program is not relativistic. Transmission coefficients for fission and particle-producing reactions must be provided from external sources.

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6. TYPICAL RUNNING TIME

Test problems run in a few seconds on Pentium III.

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9. STATUS
Package ID Status date Status
PSR-0248/04 24-NOV-2000 Tested at NEADB
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10. REFERENCES
PSR-0248/04, included references:
- R.D. Lawson and A.B. Smith:
ABAREX - A Neutron Spherical Optical-Statistical-Model Code
A User's Manual - ANL/NDM-145, Rev.I (June 1999)
-  A.B. Smith:
Elemental Abarex - A User's Manual - ANL/NDM-147 (June 1999)
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
PSR-0248/04 FORTRAN-77, FORTRAN-95
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13. SOFTWARE REQUIREMENTS

MS DVF and Lahey FORTRAN-95 compilers have been used on the PC, together with Linux g77. The code was also compiled on an IBM RS/6000 under AIX4.3.4 with the xlf compiler 3.2.5.4.

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15. NAME AND ESTABLISHMENT OF AUTHORS

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

 

Developed by:   A.B. Smith
                Argonne National Laboratory
                Argonne, Illinois, U. S. A.

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16. MATERIAL AVAILABLE
PSR-0248/04
ABA98REV.FOR FORTRAN source
EXAMPLE.31 Example 3.1
EXAMPLE.32 Example 3.2
EXAMPLE.33 Example 3.3
EXAMPLE.34 Example 3.4
EXAMPLE.41 Example 4.1
EXAMPLE.42 Example 4.2
EXAMPLE.51 Example 5.1
EXAMPLE.52 Example 5.2
EXAMPLE.61 Example 6.1
EXAMPLE.62 Example 6.2
EXAMPLE.62A Example 6.2a
EXAMPLE.62B Example 6.2b
EXAMPLE.62C Example 6.2c
EXAMPLE.62D Example 6.2d
F77L3.EER
ABA98.EXE
INPUT
README.1ST
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: angular distribution, capture, elastic scattering, gamma radiation, neutron cross sections, nuclear models, optical models, statistical models.