Computer Programs
IAEA0918 NX-1.
last modified: 02-MAY-1991 | catalog | categories | new | search |

IAEA0918 NX-1.

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

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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. METHODS

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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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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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA0918/01 FORTRAN-77
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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.