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IAEA0902 LIANG.

LIANG, Neutron Induced Compound Nucleus Reaction Cross-Sections by Statistical Model

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:  LIANG.
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2. COMPUTERS
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Program name Package id Status Status date
LIANG IAEA0902/01 Tested 14-JAN-1988

Machines used:

Package ID Orig. computer Test computer
IAEA0902/01 DEC PDP-11 DEC VAX 11/780
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3. DESCRIPTION OF PROGRAM OR FUNCTION

Calculates various neutron- induced compound reaction cross sections, such as (n,gamma), (n,f),  coumpound elastic scattering cross section, (n,n') compound nucleus  formation cross section, excitation curves for all discrete levels and outgoing neutron spectra.
Input involves optical model parameters, fission and radiative capture parameters and others.
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4. METHOD OF SOLUTION:  Gaussian integration with 12-points is used.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

  1. The maximum number of incident energy points is 60.
  2. The number of outgoing energy points for spectra is 14
     (12 Gaussian integration points plus starting and end points).
  3. The maximum number of discrete levels is 30.
  4. Energy range of incident neutrons is 0.001 - 5 MeV (but for
     even target nuclei the results at above 3 MeV incident energy
     are not good).
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6. TYPICAL RUNNING TIME

About one hour for 241Am with 54 energy points from .001 MeV to 3.0 MeV.
IAEA0902/01
NEA-DB ran the test case included in this package on a  VAX-11/780 computer in 15 seconds of CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM

  1. The level width fluctuation correction is taken into account
2. The level density parameter at the saddle point for the fission   channel can be adjusted as a function of excitation energies      for the compound nucleus.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
IAEA0902/01 14-JAN-1988 Tested at NEADB
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10. REFERENCES

- Symposium on Nuclear Reactions, Theoretical Methods and
  Applications, 260 (1980) Published in Chinese by CNDC,
  HSJ-78237(11JS)
IAEA0902/01, included references:
- Code LIANG Description and User's Manual.
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11. MACHINE REQUIREMENTS:
IAEA0902/01
To run the test case included in this package on a VAX-11/780 computer, 1172 pages of virtual storage were required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA0902/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
IAEA0902/01
VAX/VMS V4.4
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

         Shi Xiangjun
         Chinese Nuclear Data Center
         Beijing, P.R. of CHINA
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16. MATERIAL AVAILABLE
IAEA0902/01
File name File description Records
IAEA0902_01.001 LIANG Information file 54
IAEA0902_01.002 LIANG Source program 777
IAEA0902_01.003 LIANG Sample case input data 40
IAEA0902_01.004 LIANG Sample case printed output 97
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: compound nuclei, elastic scattering, neutron cross sections, optical models.