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NEA-0971 MCRTOF.

MCRTOF, Multiple Scattering of Resonance Region Neutron in Time of Flight Experiments

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1. NAME OR DESIGNATION OF PROGRAM:  MCRTOF.
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2. COMPUTERS
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Program name Package id Status Status date
MCRTOF NEA-0971/01 Tested 07-NOV-1984

Machines used:

Package ID Orig. computer Test computer
NEA-0971/01 FACOM M-380 IBM 3081
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3. DESCRIPTION OF PROGRAM OR FUNCTION

Multiple scattering of neutrons in the resonance energy region impinging on a disk with an arbitrary angle.
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4. METHOD OF SOLUTION

The Monte Carlo method is employed to simulate  the path of an incident neutron in a medium for which macroscopic cross sections are determined by resonance parameters. By tracing a  large number of neutrons, probabilities for capture, transmission, front-face scattering, rear-face scattering and side-face scattering are determined and printed out as function of incident neutron energy. Optionally, the distribution of capture locations in the disk can be printed. The incident neutron energy is swept to fit a situation as encountered in time-of-flight experiments.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The cross section file is constructed from input resonance parameters with a single- level Breit-Wigner formula. The following restrictions and simplifications apply:
- The maximum number of resonances is five.
- Reactions other than capture and scattering are neglected.
- The angular scattering distribution in the center-of-mass system   is assumed to be uniform.
- Chemical binding effects are neglected.
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6. TYPICAL RUNNING TIME

Depends on resonance parameters and disk thickness. Typical running time for peak shape lookup is about 30 seconds per resonance.
NEA 0971/01: NEA-DB executed the 2 test cases included in the package. Execution times were: 10.24 seconds for test case 1 and 98.18 seconds for test case 2.
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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
NEA-0971/01 07-NOV-1984 Tested at NEADB
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10. REFERENCES:
NEA-0971/01, included references:
- Makio Ohkubo:
  MCRTOF - A Monte Carlo Program for Multiple Scattering of Neutrons
  in Resonance Energy Region.
  JAERI-M 7988  (November 1978)
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11. MACHINE REQUIREMENTS:  236K bytes of main storage on IBM 3081.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0971/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  MVS-SP (IBM3081).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

         Mako Ohkubo
         Japan Atomic Energy Research Institute
         Tokai-mura
         Ibaraki-ken
         JAPAN
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16. MATERIAL AVAILABLE
NEA-0971/01
File name File description Records
NEA0971_01.003 MCRTOF INFORMATION FILE 64
NEA0971_01.004 MCRTOF SOURCE (CARD IMAGES) 1027
NEA0971_01.005 JCL 46
NEA0971_01.006 MCRTOF TEST CASE 1 INPUT DATA 10
NEA0971_01.007 MCRTOF TEST CASE 1 PRINTED OUTPUT 1551
NEA0971_01.008 MCRTOF TEST CASE 2 INPUT DATA 10
NEA0971_01.009 MCRTOF TEST CASE 2 PRINTED OUTPUT 907
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17. CATEGORIES
  • O. Experimental Data Processing

Keywords: Monte Carlo method, neutron cross sections, neutron detectors, neutron spectra, resonance scattering, scattering.