Computer Programs
IAEA1261 PEGAS.
last modified: 03-MAR-1993 | catalog | categories | new | search |

IAEA1261 PEGAS.

PEGAS, Unified Model for Particle and Gamma Emission Nuclear Reactions

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1. NAME OR DESIGNATION OF PROGRAM:  PEGAS.
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2. COMPUTERS
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Program name Package id Status Status date
PEGAS IAEA1261/01 Tested 03-MAR-1993

Machines used:

Package ID Orig. computer Test computer
IAEA1261/01 IBM PC PC-80486
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3. DESCRIPTION OF PROGRAM OR FUNCTION

Pre-Equilibrium-Equilibrium
Gamma-And-Spin Code based on the unified model of nuclear reactions. Angular-momentum couplings correctly taken into account for all processes; nucleon as well as gamma emissions calculated with all possible cascades. Present version designed for reactions induced by nucleons.
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4. METHOD OF SOLUTION

Master equations of the exciton model; solved by algorithm of Chatterjee and Gupta. Gamma emission according to Oblozinsky. General philosophy of PEGAS code is derived from the nonspin version, named PEQAG.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Basic version: spins < 15h, exc. energy < 30 h, nucleon and gamma emission considered, up to 4 successive nucleons. The limitations in spin, energy, and number of successive nucleons may be shifted by simple readjusting of the dimensions of arrays.
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6. TYPICAL RUNNING TIME

AT-386: about 1 hour for 15 MeV incident nucleon on medium-mass target with energy step of 0.5 MeV.
IAEA1261/01
NEA-DB ran the test case included in this package on an 80486-compatible desktop computer in 12 minutes 48 seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM

Fully pre-equilibrium (master- equation) formalism, which is consistently used at all stages of the reaction. Correct application of angular-momentum couplings for the  particle and the gamma emission rates, as well as for the intermediate-state transmission rates. Full account of cascades with gammas and nucleons in arbitrary order. Easy to modify and calculate exclusive spectra.
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8. RELATED AND AUXILIARY PROGRAMS

The general philosophy of PEGAS follows closely that of previous, non-spin versions, named PEQAG and PEQGM.
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9. STATUS
Package ID Status date Status
IAEA1261/01 03-MAR-1993 Tested at NEADB
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10. REFERENCES:
IAEA1261/01, included references:
- E. Betak and P. Oblozinsky:
  PEGAS - Pre-Equilibrium Gamma-And-Spin Code (PC Version)
  (October 1992).
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11. MACHINE REQUIREMENTS

About 510 KB of free RAM memory plus about 3.5 MB free space for scratch files on disc.
IAEA1261/01
The executable file has a size of 500K bytes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA1261/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS.
IAEA1261/01
MS-DOS V5.00 with compiler MS FORTRAN V5.00.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

See
item 5 of this abstract; the more detailed instructions for modifications are contained in the report.
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15. NAME AND ESTABLISHMENT OF AUTHORS

          Emil Betak and Pavel Oblozinsky
          Institute of Physics
          Slovak Academy of Sciences
          Dubravska cesta 9, Czechoslovakia
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16. MATERIAL AVAILABLE
IAEA1261/01
File name File description Records
IAEA1261_01.001 Information file 85
IAEA1261_01.002 PEGAS.FOR FORTRAN source 1546
IAEA1261_01.003 CL.BAT Batch file to compile & link 3
IAEA1261_01.004 RUN.BAT Batch file to execute 3
IAEA1261_01.005 PEGAS.INP Sample problem input 6
IAEA1261_01.006 PEGAS.OUT Sample problem output 396
IAEA1261_01.007 PEGAS.EXE Executable file 0
IAEA1261_01.008 DOS file-names 7
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: nuclear models, optical models, photons.