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IAEA0919 NX-2.

NX-2, Excitation Function of (N-D) and (N-He3) Reaction

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1. NAME OR DESIGNATION OF PROGRAM:  NX-2.
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2. COMPUTERS
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Program name Package id Status Status date
NX-2 IAEA0919/01 Tested 02-MAY-1991

Machines used:

Package ID Orig. computer Test computer
IAEA0919/01 CDC CYBER 175 DEC VAX 8810
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3. DESCRIPTION OF PROGRAM OR FUNCTION

NX-2 calculates excitation functions of (n,d) and (n,3He) reactions.
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4. METHOD OF SOLUTION

The formulas for the excitation function are analytical expressions. Therefore no numerical techniques are required. They have been derived based on an evaporation model considering preequilibrium emission. Some primary approximations are as follows:
1. The pre-equilibrium emission only occurs at the state of exciton     number n=3.
2. There is only one competing reaction of (n,n').
3. Secondary particle emission was omitted.
4. A complex particle such as d, t, 3He or alpha is regarded as an  exciton which is priorly formed in the target nucleus with  a probability P(g). In this work, we took P(alpha)=0.2 and P(d    P(t) and   P(3He)<<1.
5. The penetration factor of a rectangular-well potential is used t     describe the effects of Coulomb barrier.
6. The energy level density of the compound nucleus is taken in the     form of constant temperature.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Incident neutron energy En<=20 MeV.   23<= target mass number A<=197.
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6. TYPICAL RUNNING TIME

Running time for the calculation of a nuclide is less than 10 sec.
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7. UNUSUAL FEATURES OF THE PROGRAM

Instead of relying on theoretical  calculations, the NX1 and NX2 are systematics calculation codes. They thus benefit from many of the features of systematics such as:  fast in calculation; no unkown parameters; etc.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
IAEA0919/01 02-MAY-1991 Tested at NEADB
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10. REFERENCES

- Z.X. Zhao,
  Systematics of Excitation Function for (n, charged particle)
  Reactions,
  Master Sinica, China, 1985 (in Chinese).
IAEA0919/01, included references:
- Zhao Zhixiang and Zhou Delin:
  Systematics of Excitation Functions for
  (n, Charged Particle) Reactions
  INDC(CPR)-8/L  (June 1986)
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11. MACHINE REQUIREMENTS:
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA0919/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

          Zhao Zhi-Xiang
          Institute of Atomic Energy
          Academia Sinica
          P.O. Box 275
          BEIJING
          P.R. CHINA
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16. MATERIAL AVAILABLE
IAEA0919/01
File name File description Records
IAEA0919_01.001 Information file 31
IAEA0919_01.002 NX-2 FORTRAN source program 143
IAEA0919_01.003 Sample problem input data 6
IAEA0919_01.004 Sample problem output 66
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: deuterons, evaporation model, helium-3, neutron reactions, precompound-nucleus emission.