NESC0469 PMS1

PMS-1, Geometry and Multiple Scattering Correlation to Experimental Polarization Data by Monte-Carlo

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM 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: PMS1

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2. COMPUTERS

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Machines used:

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3. DESCRIPTION OF PROBLEM OR FUNCTION

PMS1 corrects experimental
fast neutron polarization data for finite geometry and multiple
scattering effects, when liquid helium is the polarizer analyzer.

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4. METHOD OF SOLUTION

The  Monte Carlo  code  simulates the  actual
geometry  of  the  experiment,   traces  scattering  histories  to
estimate  multiple-scattering asymmetry  for  an incident  neutron
beam of  arbitrary polarization.   The code  uses phase  shifts to
calculate the  necessary parameters, the angular  distributions (d
sigma)/(d  omega),  the  polarization  p  and  the  spin  rotation
parameter  beta needed  for  consistent  tracking of  polarization
effects in successive scattering.  The  phase shift data are taken
from the fitted data of Hoop and  Barschall above 1.5 MeV and from
Morgan and  Walter below  1.5 MeV.  The  code adjusts  the initial
input  polarization needed  to reproduce  the measured  left-right
count ratio for the two detectors.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

No more  than five
collisions are  allowed and  liquid helium  must be  the polarizer
analyzer.   The total  number  of energy  points  for which  phase
shifts are given must be less than 100.

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6. TYPICAL RUNNING TIME: About 3 minutes per case are required.

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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

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10. REFERENCES

G. W. Morrison, T. G. Miller,  and F. P. Gibson, PMS1
- A FORTRAN  Monte Carlo  Code for  Correcting Experimental  Fast-
neutron Polarization Data, CTC-9, December 1969.
             B. Hoop and  H. H. Barschall, Scattering  of Neutrons
by Alpha-Particles, Nuclear Physics, Vol. 83, p. 65, 1966.

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11. MACHINE REQUIREMENTS: 32K memory

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12. PROGRAMMING LANGUAGE(S) USED

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: OS/360.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

                 G. W. Morrison
                 Oak Ridge National Laboratory
                 P. O. Box X
                 Oak Ridge, Tennessee  37830
                 F. P. Gibson and T. G. Miller
                 U. S. Army Missile Command
                 Redstone Arsenal, Alabama  35808

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16. MATERIAL AVAILABLE

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17. CATEGORIES

Keywords: Monte Carlo method, elastic scattering, helium, polarization, statistics.