IAEA0944 POLLA/IAECTA.

POLLA/IECTA, ENDF/B Reich-Moore to Adler-Adler Resonance Parameter Conversion

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: POLLA/IAECTA.

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2. COMPUTERS

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Program name	Package id	Status	Status date
POLLA/IAECTA	IAEA0944/01	Tested	10-AUG-1987

Machines used:

Package ID	Orig. computer	Test computer
IAEA0944/01	CDC CYBER 170	CDC CYBER 740

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3. DESCRIPTION OF PROGRAM OR FUNCTION

POLLA1 transforms Reich-Moore resolved resonance parameters to the corresponding positive momentum Adler-Adler ones. It is designed to run directly on a file in the ENDF/B format, creating a new file in which the Reich-Moore parametrization has been replaced by the Adler-Adler one.

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4. METHOD OF SOLUTION

The Adler-Adler poles are obtained by applying Newton's method to the inverse of the determinant of the Reich-Moore pole matrix. The perturbative solution of R.B. Perez and G. de Saussure, Phys. Rev. C10 (1974)187, is used as a first guess. The residues at the poles are calculated using a simple numerical difference method.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

As currently dimensioned, the program permits a maximum of 400 coherent resonances. The transformation itself, which neglets all negative momentum poles, is only accurate for heavy nuclei.

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6. TYPICAL RUNNING TIME: Varies greatly from case to case.

IAEA0944/01

NEA-DB executed the test case included in this package on a CDC CYBER 740 computer in 20.7 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS

POLLA1 is an improved and extended version of the code POLLA of G. de Saussure and R.B. Perez.

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9. STATUS

Package ID	Status date	Status
IAEA0944/01	10-AUG-1987	Tested at NEADB

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10. REFERENCES

- R.B. Perez and G. de Saussure,
Phys. Rev C10 (1974)187.

IAEA0944/01, included references:

- G.  de Saussure  and R.  B. Perez:
  POLLA, A  FORTRAN Program to  Convert R-Matrix-Type Multilevel
  Resonance Parameters for Fissile Nuclei into  Equivalent Kapur
  Peierls-Type Parameters.
  ORNL-TM-2599  (June 1969)
- B.V. Carlson, E.S. Chalhoub and M. Melnikoff:
  Modification and Testing of the Code POLLA
  IEAv/NT-08/85  (August 12, 1985)

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11. MACHINE REQUIREMENTS:

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
IAEA0944/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: Standard.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

         B.V. Carlson, E.S. Chalhoub and M. Melnikoff
         Instituto de Estudos Avancados/CTA
         Rodovia dos Tamoios km 5,5
         12200 Sao Jose dos Campos, SP
         BRASIL

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16. MATERIAL AVAILABLE

IAEA0944/01

File name	File description	Records
IAEA0944_01.001	Information file	46
IAEA0944_01.002	Fortran source	690
IAEA0944_01.003	Sample input data (for FT05)	2
IAEA0944_01.004	Library data (for FT01)	284
IAEA0944_01.005	Sample output (FT06)	504
IAEA0944_01.006	Sample output (FT02)	420
IAEA0944_01.007	JCL	8

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17. CATEGORIES

A. Cross Section and Resonance Integral Calculations
M. Data Management

Keywords: ENDF/B, adler-adler formula, cross sections, neutron cross sections, nuclear reactions, reich-moore formula, resolved region, resonance, resonance absorption, resonance scattering.