Computer Programs

NAME, COMPUTER, PROBLEM, SOLUTION, RESTRICTIONS, CPU, FEATURES, STATUS, REFERENCES, LANGUAGE, AUTHOR, MATERIAL, CATEGORIES

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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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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:

The pre-equilibrium emission only occurs at the state of exciton number n=3.

There is only one competing reaction of (n,n').

The (n,pn) and (n,alphan) reactions are primary channels for secondary particle emission.

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.

The penetration factor of a rectangular-well potential is used t describe the effects of Coulomb barrier.

The energy level density of the compound nucleus is taken in the form of constant temperature.

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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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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 |

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