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NEA-0530 FANAC.

FANAC, Resonance Parameter by Multilevel Shape Analysis of Neutron Capture Yield Data

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1. NAME OR DESIGNATION OF PROGRAM:  FANAC.
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2. COMPUTERS
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Program name Package id Status Status date
FANAC NEA-0530/01 Tested 01-DEC-1981

Machines used:

Package ID Orig. computer Test computer
NEA-0530/01 IBM 3033 IBM 3033
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3. NATURE OF PHYSICAL PROBLEM SOLVED

Resonance parameter determination by multi-level shape analysis of neutron capture yield data.
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4. METHOD OF SOLUTION

Simultaneous least-squares fit to several sets of time-of-flight (TOF) capture data. Reich-Moore cross section formalism for s-wave, single-level Breit-Wigner formalism for p-, d- ... wave resonances. Monte Carlo calculation of second-, third- etc. collision yields. Numerical resolution broadening.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The code was written  for light- and medium-mass nuclei (or nearly magic nuclei), e.g. structural materials like iron, nickel, ... or lead. Doppler broadening is neglected for s-wave resonances, level-level and resonant-potential interference for p-, d-, ... wave levels. The sample is taken as a cylindrical disc with its axis parallel to the  neutron beam. Scattering anisotropy in the c.m.s. frame is neglected. The programme accepts up to 5 TOF data sets (which may differ with respect to sample thickness and radius, energy range, instrumental resolution etc.), 200 cross section parameters (20 of them adjustable) and 512 data points (with uncertainties). Gaussian  or chi-squared resolution function.
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6. TYPICAL RUNNING TIME:  2-20 min. on IBM/370-168 for 3-4 iterations.
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7. UNUSUAL FEATURES OF THE PROGRAM

High speed due to hybrid resonance  formalism (see above under 4.). Automatic internal mesh determination. No regular energy or flight-time grid required for input data. Conveniently structured input containing only physics information (no numbers of cards, points, resonances etc.), same resonance cards as for transmission shape analysis code FANAL, KFK 2129. Importance sampling in the Monte Carlo simulation of multiple  scattering. Two-channel Reich-Moore formulae for inelastic scattering.
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8. RELATED AND AUXILIARY PROGRAMS

KFK plot subroutine PLOTA must be replaced by similar subroutine or dummy outside KFK. Necessary instructions are given on comment cards.
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9. STATUS
Package ID Status date Status
NEA-0530/01 01-DEC-1981 Tested at NEADB
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10. REFERENCES

- F.H. Froehner:
  KFD 2145 (1977), see also KFK 2669 (1978).
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11. MACHINE REQUIREMENTS:  476k bytes of core memory space.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0530/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM
OS, ASP.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Random number generator RANDU must be replaced by equivalent where unavailable for generation of random numbers in the interval 0...1.
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15. NAME AND ESTABLISHMENT OF AUTHOR

      F.H. Froehner, INR
      Kernforschungszentrum, Postfach 3640
      D-7500 Karlsruhe, West Germany
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16. MATERIAL AVAILABLE
NEA-0530/01
File name File description Records
NEA0530_01.001 INFORMATION 30
NEA0530_01.002 JOB CONTROL 94
NEA0530_01.003 ASSEMBLER RANDOM NUMBER GENERATOR ROUTINE 18
NEA0530_01.004 FANAC FORTRAN SOURCE 1740
NEA0530_01.005 SAMPLE PROBLEM INPUT 204
NEA0530_01.006 SAMPLE PROBLEM OUTPUT 3958
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: Breit-Wigner formula, Monte Carlo method, collisions, cross sections, least square fit, multilevel analysis, reich-moore formula, resonance scattering.