**1. NAME AND TITLE**

PEQAG-2: A Pre-equilibrium Computer Code With Gamma Emission

**2. CONTRIBUTOR**

Institute of Physics, Bratislava, Czechoslovakia, through IAEA, Vienna, through NEA Data Bank,
France.

**3. CODING LANGUAGE AND COMPUTER**

Fortran 77; IBM PC/AT.

**4. NATURE OF PROBLEM SOLVED**

PEQAG-2 performs an exciton model calculation of angle-integrated nucleon and gamma energy
spectra. All the emissions are treated consistently within the pre-equilibrium approach based on the
master equations of the model. Multiple particle and/or multiple gamma emissions are included.

**5. METHOD OF SOLUTION**

Angle-integrated energy spectra of neutrons, protons and gammas, as well as the corresponding
integrals are computed. No angle-dependent or spin-dependent calculations are included. The state
density used is the equidistant-spacing model in the finite potential well. Inverse cross sections may
be supplied by the program according to the approximation of Chatterjee et al, and the GDR shape is
also built-in.

**6. RESTRICTIONS OR LIMITATIONS**

Up to four nucleons are emitted and interspersed and/or preceded by arbitrary number of gammas.
The maximum energy is 100 times the energy step used.

**7. TYPICAL RUNNING TIME**

The sample input problem was run at NEA Data Bank on an IBM PC/AT with a math coprocessor.
The problem took 8 minutes and 50 seconds.

**8. COMPUTER HARDWARE REQUIREMENTS**

PEQAG-2 runs on an IBM PC/AT with a math coprocessor.

**9. COMPUTER SOFTWARE REQUIREMENTS**

The code was written in Fortran 77. The NEA Data Bank used Microsoft Fortran version 5.0 and
the RM/Fortran compiler, version 2.42 under the MS-DOS 3.20 operating system.

**10. REFERENCE**

E. Betak, "PEQAG2: An Updated PC Version of Fully Pre-Equilibrium Computer Code With
Gamma Emission," IAEA1185 (December 13, 1989).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one DS/HD (1.2 MB) 5.25-inch diskette.

**12. DATE OF ABSTRACT**

November 1990.

**KEYWORDS: ** GAMMA RAY SOURCE ANALYSIS; MICROCOMPUTER; NUCLEAR MODELS; NEUTRON; PROTON