IAEA1261 PEGAS.

PEGAS, Unified Model for Particle and Gamma Emission Nuclear Reactions

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: PEGAS.

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

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.