NEA-0482 PIXSE.

PIXSE, Scattering Moments Calculation from Scattering Law

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, 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 OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: PIXSE.

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2. COMPUTERS

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Program name	Package id	Status	Status date
PIXSE	NEA-0482/01	Tested	01-NOV-1978

Machines used:

Package ID	Orig. computer	Test computer
NEA-0482/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

An input scattering law S(alpha,beta) is read and the moments of scatter are calculated over an energy point or energy group mesh.

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4. METHOD OF SOLUTION

See AEEW M 318 (UKAEA Report). Integrations over energy and angle are performed by Gaussian quadrature.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The arrays can be increased in size to incorporate larger problems. Currently the input S(alpha,beta) can be described at up to 90 alpha and 90 beta points and the output data in 42 energy groups.

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6. TYPICAL RUNNING TIME

12 minutes (ICL-470) to calculate and write to magnetic tape the isotropic and linearly anisotropic cross sections in 42 groups (with upscatter to and sources from energies above these thermal groups) using an input S(alpha,beta) matrix.

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7. UNUSUAL FEATURES OF THE PROGRAM: Treats many moments of scatter.

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8. RELATED AND AUXILIARY PROGRAMS: LEAP, ADDELT.

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9. STATUS

Package ID	Status date	Status
NEA-0482/01	01-NOV-1978	Tested at NEADB

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10. REFERENCES

NEA-0482/01, included references:

- J.D. MacDougall:
  PIXSE
  AEEW- M 318 (April 1963).
- Notes on Modification to PIXSE.
- C.E.T.I.S.:
  "How to Use" for the Whole of the Programmes: GALAXY, PIXSE, WDSN,
  WED, THULE, TLIB, TED
  EUR/C/IS/199/66-e.

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11. MACHINE REQUIREMENTS

High speed memory - amount depends on array sizes.
Input and output magnetic tape units.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0482/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

Operational on ICL system 4 but written to be transportable.

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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

Original author - J.D. MacDougall
                  AEE Winfrith
                  Dorchester, Dorset, United Kingdom.

Subsequent author A.T.D. Butland
                  AEEW Winfrith
                  Dorchester, Dorset, United Kingdom.

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16. MATERIAL AVAILABLE

NEA-0482/01

File name	File description	Records
NEA0482_01.001	INFORMATION	4
NEA0482_01.002	SOURCE PROGRAM (F4,EBCDIC)	1077
NEA0482_01.003	DD CARDS FOR THE EXECUTION	6
NEA0482_01.004	SAMPLE PROBLEM INPUT DATA	11
NEA0482_01.005	SAMPLE PROBLEM PRINTED OUTPUT	329

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17. CATEGORIES

A. Cross Section and Resonance Integral Calculations

Keywords: anisotropic scattering, cross sections, isotropy, scattering law.