IAEA0918 NX-1.

NX-1, Excitation Function of (N-P) and (N-He4) Reaction

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM 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: NX-1.

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2. COMPUTERS

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Program name	Package id	Status	Status date
NX-1	IAEA0918/01	Tested	02-MAY-1991

Machines used:

Package ID	Orig. computer	Test computer
IAEA0918/01	CDC CYBER 175	DEC VAX 8810

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3. DESCRIPTION OF PROGRAM OR FUNCTION

NX-1 calculates excitation functions for (n,p) and (n,alpha) 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. The (n,pn) and (n,alphan) reactions are primary channels for    secondary particle emission.
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 calculation of a nuclide is below 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
IAEA0918/01	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).

IAEA0918/01, 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
IAEA0918/01	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

IAEA0918/01

File name	File description	Records
IAEA0918_01.001	Information file	33
IAEA0918_01.002	NX-1 FORTRAN source program	150
IAEA0918_01.003	Sample problem input data	4
IAEA0918_01.004	Sample problem output	60

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17. CATEGORIES

A. Cross Section and Resonance Integral Calculations

Keywords: alpha particles, evaporation model, neutron reactions, precompound-nucleus emission, protons.