Computer Programs
NESC0639 POLLA
last modified: 01-OCT-1975 | catalog | categories | new | search |

NESC0639 POLLA

POLLA-NESC, Resonance Parameter R-Matrix to S-Matrix Conversion by Reich-Moore Method

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1. NAME OR DESIGNATION OF PROGRAM:  POLLA
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2. COMPUTERS
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Program name Package id Status Status date
POLLA-NESC NESC0639/01 Tested 01-OCT-1975

Machines used:

Package ID Orig. computer Test computer
NESC0639/01 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

The program transforms a set of r-matrix nuclear resonance parameters into a set of equivalent s-matrix (or Kapur-Peierls) resonance parameters.
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4. METHOD OF SOLUTION

The program utilizes the multilevel formalism of Reich and Moore and avoids diagonalization of the level matrix. The parameters are obtained by a direct partial fraction expansion of the Reich-Moore expression of the collision matrix. This approach appears simpler and faster when the number of fission channels is known and small. The method is particularly useful when a large number of levels must be considered because it does not require diagonalization of a large level matrix.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

By DIMENSION statements, the program is limited to maxima of 100 levels and 5 channels.
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6. TYPICAL RUNNING TIME

The sample problem requires less than one minute on the IBM360/91.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC0639/01 01-OCT-1975 Tested at NEADB
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10. REFERENCES:
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11. MACHINE REQUIREMENTS

The program requires 240K bytes to compile, 62K bytes to execute.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0639/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/360.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

   The
running time increases as the ratio of average width to spacing increases.
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 G. de Saussure and R. B. Perez
                 Oak Ridge National Laboratory
                 P. O. Box X
                 Oak Ridge, Tennessee  37830
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16. MATERIAL AVAILABLE
NESC0639/01
File name File description Records
NESC0639_01.001 SOURCE PROGRAM (F4) 232
NESC0639_01.002 SAMPLE PROBLEM DATA 107
NESC0639_01.003 SAMPLE PROBLEM PRINTED OUTPUT 217
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: R matrix, S matrix, multilevel analysis, reich-moore formula, resonance.