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IAEA0907 MUP-2.

MUP-2, Fast Neutron Nuclear Reaction Cross-Sections of Medium-Heavy Nuclei

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1. NAME OR DESIGNATION OF PROGRAM:  MUP-2.
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2. COMPUTERS
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Program name Package id Status Status date
MUP-2 IAEA0907/03 Tested 07-DEC-1989

Machines used:

Package ID Orig. computer Test computer
IAEA0907/03 FACOM M-340-S IBM 3090
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The complete program calculates the fast neutron data of medium-heavy nuclei. It includes: the total cross sections, elastic scattering cross section, nonelastic cross section, total inelastic cross section, (n,2n) and (n,3n), cross section, (n,n'x) cross section where x may be alpha, p, d, t and He3, (n,n') cross section for leaving the residual nucleus in from the first up to the 40th excited state and the continuum state, radiative capture cross section, (n,x) cross section where x may be  p, d, t, He3 and alpha, (n,2alpha) and (n,2p) cross section, (n,px)  cross section where x may be alpha, d, t and He3, (n,alphax) cross section where x may be d and t, the average cosine of the scattering angle (laboratory system) for elastic scattering, the average logarithmic energy decrement for elastic scattering, the average of  the square of the logarithmic energy decrement for elastic scattering divided by twice the average logarithmic, the (n,x) cross section for leaving the residual nucleus in from the ground state up to be 17th excited state and in the continuum state where x may be p, d, t, He3 and alpha. The elastic scattering angular distribution and inelastic scattering angular distribution for leaving the residual nucleus in the first up to 40th excited state.  The (n2n), (n,3n), (n,n'x) reactions, where x may be alpha, p, d, t
and He3 and the inelastic scattering secondary neutron spectra. All  nuclear data are given for the natural elements as well as their isotopes and their output is according to ENDF/B-IV format. The incident neutron energy region, where 150 energy points at most may  be included, is from 1 KeV to 20 MeV. The program includes the optical model, width fluctuation corrected Hauser-Feshbach formula and preequilibrium statistical theory based on the exciton model. The experimental direct reaction component of the inelastic scattering projectile exciting from the first up to the 4th excited  state may be placed in the input. These are added to the calculated compound nucleus cross sections with a given weight. All  nuclear level densities required are calculated according to the formulation of A. Cameron. The transmission coefficients or inverse cross sections of the particles used in statistical theory are calculated by the optical model. The gamma-ray transmission coefficients are calculated based on the giant dipole resonance model. The optical potentials used are Wood- Saxon for the real part, Wood Saxon and derivative Wood-Saxon for the imaginary part corresponding to the volume and surface absorptions respectively, and Thomas form for the spin-orbit part. For some special elements of which the experimental data are unknown, this program provides a microscopic optical potential calculation with skyrme forces for neutron or proton channels.
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4. METHOD OF SOLUTION

The radial wave function in the optical model is solved by the Cowell method and the double precision arithmetic is used. The Gauss's ten points method is used for numerical integrations.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

1) The calculations are restricted to medium-heavy nuclei, for      which the fission reactions are absent.
2) The maximum number of the isotopes of the target nucleus is      limited up to six.
3) The energy region of indicent neutrons is restricted to from  0.01 to 20MeV. In this region the maximum number of energy      points is up to 150.
4) The maximum number of energy points of outgoing secondary      neutrons is up to 100.
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6. TYPICAL RUNNING TIME

The running time depends on the number of the open channels in the considered energy region and on the number of the isotopes of the target nucleus. For example, the running time for calculating a whole set of neutron data of the natural Sodium, for which the number of isotopes is only one and the third reaction  process does not open, from 1MeV to 20MeV and for 79 energy points is 24.17 minutes on the M-340S.
IAEA0907/03
NEA-DB ran the test case included in this package on an IBM 3090 computer in 14 seconds fo CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

MUP-2 is an extension and improvememt of MUP-1. AUJP is a related program, which automatically searches an optimum set of the neutron optical model parameters for  medium-heavy nuclei by means of the CHI SQUARE method, this optimum  set of the neutron optical model parameters is the input of MUP-2.
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9. STATUS
Package ID Status date Status
IAEA0907/03 07-DEC-1989 Tested at NEADB
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10. REFERENCES

- C.M. Perey et al.,
  Atomic Data and Nuclear Data Tables, 17, 3 (1976).
- Su Zong-Di et al.,
  Physica Energiae Fortis et Physica Nuclears, 3,80 (1979).
- J.J. Griffrn,
  Phys. Rev. Letters. 17,478 (1966).
- C.K. Cline,
  Nuclear Physics, A 193,417 (1972).
- A. Gilbert et al.,
  Can J. Phys. 43,1446 (1965).
IAEA0907/03, included references:
- Cai Chonghai et al.:
  Directions for MUP2 Users (October 1986)
- Su Zong Di and P.E. Hodgson:
  Comparison between Chinese Unified Program (MUP2) and
  International Nuclear Model Programs.
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11. MACHINE REQUIREMENTS

The tapes, discs and printer are necessary for output. Amount of memory: 4096K bytes.
IAEA0907/03
Program execution on an IBM 3090 required 2764K bytes of main storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA0907/03 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: FACOM OS IV/F4.
IAEA0907/03
MVS/XA (IBM 3090).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

   1) The double precision arithmetic is necessary
2) The unit numbers is five for input and six, seven and eight       for output respectively.
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15. NAME AND ESTABLISHMENT OF AUTHORS

        Nankai University
           C.N.D.C.
      Cai Conghai, Zhang Xiaocheng, Zuo Yixin
      Zhou Hungmo, Yu Ziqiang, He Guozhu

        Wuhan University
      Lui Dunhuan

        Institute of Atomic Energy
      Shen Qingbiao, Tian Ye
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16. MATERIAL AVAILABLE
IAEA0907/03
File name File description Records
IAEA0907_03.001 INFORMATION FILE 59
IAEA0907_03.002 MUP-2 FORTRAN SOURCE 4092
IAEA0907_03.003 JCL USED IN TESTING 105
IAEA0907_03.004 TEST CASE INPUT DATA 142
IAEA0907_03.005 TEST CASE OUTPUT DATA 610
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: cross sections, fast neutrons, nuclear reactions.