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NESC0033 GAM.

GAM, Slowing-Down Neutron Spectra in P1 and B1 Approximation, MultiGroup Constant

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1. NAME OR DESIGNATION OF PROGRAM:  GAM-1.
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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
GAM-1 NESC0033/02 Tested 01-NOV-1967
GAM-2 NESC0033/03 Tested 01-SEP-1968

Machines used:

Package ID Orig. computer Test computer
NESC0033/02 IBM 360 series IBM 360 series
NESC0033/03 IBM 360 series IBM 360 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

This program computes the slowing-down spectrum in either the P1 or the B1 approximation using 68 groups of neutrons with a constant group width DU=0.25, multigroup constants are calculated for up to 32 fast groups.
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4. METHODS

METHOD OF SOLUTION. Special features of this code include

(a) a subroutine that calculates resonance integrals from the resonance parameters for each group using the quantitative methods developed by L. W. Nordheim.
(b) The energy angle correlation is retained for slowing-down in all isotopes. That is, the P0 and P1 components of the  scattering kernel are treated rigorously. For the common  moderating materials and for some of the more common  isotopes, terms up to P6 in the Legendre expansion of the scattering cross section in the center of mass system are  retained. For other isotopes, the scattering matrices are  correct for linearly anisotropic scattering in the center of mass system.
(c) The code contains an option that will calculate the neutron age in an infinite medium by the moments method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  Nine different source spectra are included as options.
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6. TYPICAL RUNNING TIME:  1 to 5 minutes are required.
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7. UNUSUAL FEATURES OF THE PROGRAM

The code contains a large library.  At present, the library tape consists of 127 nuclides. The library tape contains all of the data needed in the calculation for each of  the 68 subgroups. Inelastic scattering and (n,2n) processes are explicitly included. Self-shielding factors may be included for any  nuclide, if desired.
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8. RELATED AND AUXILIARY PROGRAMS

REP, to reproduce GAM library tape for the 7090 and 1604, update, to update GAM library tape for the 7090, and GAMLIBM, to prepare, print, and edit GAM library tapes for the 3600.
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9. STATUS
Package ID Status date Status
NESC0033/02 01-NOV-1967 Tested at NEADB
NESC0033/03 01-SEP-1968 Tested at NEADB
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10. REFERENCES

- G.D. Joanou, E.J. Leshan, and J.S. Dudek:
  GAM-1, A Consistent P1 Multigroup Code for the Calculation of The Fast Neutron Spectrum and Multigroup Constants.
  GA-1850, May 1961
- G.D. Joanou, J.S. Dudek, A.J. Goodjohn, N.F. Wikner, and J.D. Garrison:
Nuclear Data for GAM-1 Data Tape.
GA-2451, volumes I and II, August 1961
- F.T. Adler, G.W. Hinman, and L.W. Nordheim:
  The Quantitative Evaluation of Resonance Integrals.
  Proceedings of the Second United Nations International Conference on Peaceful Uses of Atomic Energy, vol. 16, pp. 155-170, Geneva, 1958.
- Format of GAM-1 BCD Library Information.
  Argonne Code Center Note, August 10, 1966
- GAM-1, Notes Concerning the Control Data Version.
- G. Jensen:
  GAM-I (R104) Usage on 3600.
  ANL Note, December 2, 1964
- G. Jensen:
  R104 GAM Library Preparation.
  ANL Note, April 12, 1965
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0033/02 FORTRAN-IV
NESC0033/03 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

FORTRAN monitor system (IBM7090), COOP monitor (CDC1604), SCOPE (CDC3600).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHOR

   7090          G. D. Joanou
                 International Business Machines Corporation
                 2670 Hanover Street
                 Palo Alto, California  94304

   1604          S. Elkin
                 Nuclear Applications Computation Center
                 Control Data Corporation
                 Computer Division
                 3145 Porter Drive
                 P. O. Box 10111
                 Palo Alto, California  94303

   3600          G. Jensen
                 Computer Sciences Corporation
                 825 Jadwin Avenue
                 Richland, Washington  99352
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16. MATERIAL AVAILABLE
NESC0033/02
File name File description Records
NESC0033_02.001 INFORMATION 3
NESC0033_02.002 SOURCE & DATA %360/65< 1675
NESC0033_02.003 OUTPUT 2122
NESC0033/03
File name File description Records
NESC0033_03.001 INFORMATION 5
NESC0033_03.002 SOURCE & DATA 3759
NESC0033_03.003 GAM-2 OUTPUT 1123
NESC0033_03.004 GAMLIST SOURCE & DATA 632
NESC0033_03.005 GAMLIST OUTPUT 2572
NESC0033_03.006 GAMSHORT SOURCE & DATA 266
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: Bl method, Pl method, anisotropic scattering, fast neutrons, group constants, lethargy, multigroup, resonance integrals, slowing-down, spectra.