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NEA-0888 PREM.

PREM, Pre-Equilibrium Energy Spectra and Cross-Sections for Multiple Nucleon Emission

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM 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 AUTHOR, MATERIAL, CATEGORIES
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1. NAME OR DESIGNATION OF PROGRAM:  PREM.
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2. COMPUTERS
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Program name Package id Status Status date
PREM NEA-0888/01 Tested 19-MAY-1983

Machines used:

Package ID Orig. computer Test computer
NEA-0888/01 IBM 370/168 IBM 370/168
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3. DESCRIPTION OF PROBLEM OR FUNCTION

PREM computes energy spectra and cross sections of (i,xnyp) processes when an initial distribution function is given. Master equations for exciton number  are solved for each generation in succession. Obtained quantities include pre-equilibrium as well as equilibrium contributions. It is  also possible to obtain the equilibrium contributions only, and also the time development function for the first generation. Angular momentum conservation is not taken into account.
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4. METHOD OF SOLUTION

The master equations are solved by the matrix inversion method or matrix diagonalization method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME:
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7. UNUSUAL FEATURES OF THE PROGRAM

When the excitation energy of the  compound system becomes low, the matrix in the master equations approaches a singular matrix. In such a case, the matrix inversion method switches automatically to the perturbation method, which is supposed to be correct for the limiting case. So it can compute for  all energy ranges.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NEA-0888/01 19-MAY-1983 Tested at NEADB
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10. REFERENCES:
- S. Yoshida: Z. Physik A308 (1982) 133.
NEA-0888/01, included references:
- Gargi Keeni and Shiro Yosida:
  Computer Code for Pre-Eqilibrium Process With Multiple Nucleon
  Emission PREM.  (Reprinted from The Science Reports of the Tohoku
  University, Series 8, Vol. 3, No. 1, June 1982)
- H. Gruppelaar and P. Nagel:
  "International Nuclear Model and Code Comparison on
  Pre-Equilibrium Effects"
  NEANDC-204"U"/INDC(NEA)6 (September 1985)
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11. MACHINE REQUIREMENTS:
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0888/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

S. Yoshida and G. Keeni
Physics Department, Faculty of Science
Tohoku University
Sendai 980, Japan.
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16. MATERIAL AVAILABLE
NEA-0888/01
File name File description Records
NEA0888_01.003 PREM INFORMATION FILE 100
NEA0888_01.004 PREM SOURCE (FORTRAN-4) 994
NEA0888_01.005 PREM JCL 6
NEA0888_01.006 PREM INPUT DATA FOR TEST CASE 21
NEA0888_01.007 PREM OUTPUT OF TEST CASE 454
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: cross sections, nuclear models, nuclear reactions, precompound-nucleus emission, spectra.