last modified: 26-JUL-1983 | catalog | categories | new | search |

PSR-0139 SIOB.

SIOB, Least Square Fit of Neutron Transmission Data Using Multilevel Breit-Wigner

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1. NAME OR DESIGNATION OF PROGRAM:  SIOB.
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2. COMPUTERS
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Program name Package id Status Status date
SIOB PSR-0139/01 Tested 26-JUL-1983

Machines used:

Package ID Orig. computer Test computer
PSR-0139/01 IBM 3081 IBM 3081
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3. DESCRIPTION OF PROBLEM OR FUNCTION

SIOB performs least-square fits of neutron transmission curves. Any number of measurements on a common energy scale for different sample thicknesses can be simultaneously fitted. The computed transmission curves can be broadened with either a Gaussian or a rectangular resolution function or both, with the resolution width function of energy. The  total cross section is expressed as a sum of single-level or multilevel Breit-Wigner terms and Doppler broadened using the fast interpolation routine QUICKW.
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4. METHOD OF SOLUTION:
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The number of data points, resonance levels and variables which can be handled simultaneously is only limited by the overall dimensions of two arrays in the program and by the stability of the matrix inversion.
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6. TYPICAL RUNNING TIME

In a test problem, seven transmissions each with 3750 data points were simultaneously fitted using 74 resonances and 110 variable parameters. The problem took 47 minutes of CPU time on an IBM 360/91, for 3 iterations.
NEA-DB executed the test case on IBM 3081 in 15 CPU seconds.
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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
PSR-0139/01 26-JUL-1983 Tested at NEADB
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10. REFERENCES:
PSR-0139/01, included references:
- G. de Saussure, D.K. Olsen and R.B. Perez:
  SIOB: A Fortran Code for Least-Squares Shape Fitting Several
  Neutron Transmission Measurements Using the Breit-Wigner
  Multilevel Formula.  ORNL/TM-6286 (ENDF-261) (May 1978)
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11. MACHINE REQUIREMENTS

To execute the test case on IBM 3081, 156K bytes of main storage are required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
PSR-0139/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
MVS-SP (IBM 3091).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.
Developed by:   Computer Sciences Division, Oak Ridge National Laboratory,
                Oak Ridge, Tennessee, USA
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16. MATERIAL AVAILABLE
PSR-0139/01
File name File description Records
PSR0139_01.001 SIOB INFORMATION FILE 47
PSR0139_01.002 SIOB SOURCE PROGRAM (FORTRAN-4) 1493
PSR0139_01.003 SIOB SOURCE PROGRAM (ASSEMBLER) 39
PSR0139_01.004 SIOB JCL 25
PSR0139_01.005 SIOB INPUT DATA FOR TEST CASE 218
PSR0139_01.006 SIOB OUTPUT OF TEST CASE 1025
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17. CATEGORIES
  • O. Experimental Data Processing

Keywords: Breit-Wigner formula, Doppler broadening, Gauss function, data analysis, experimental data, interpolation, least square fit, multilevel analysis, neutron flux, neutron spectra, resonance absorption, transmission.