NEA-0675 AMALTHEE.

AMALTHEE, Emission Spectra for N, D, H3, He3, He4 Induced Reactions

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM 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 AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: AMALTHEE.

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2. COMPUTERS

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Program name	Package id	Status	Status date
AMALTHEE	NEA-0675/01	Tested	24-FEB-1981

Machines used:

Package ID	Orig. computer	Test computer
NEA-0675/01	CDC 7600	CDC 7600

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3. DESCRIPTION OF PROBLEM OR FUNCTION

Calculates the energy spectra of particles emitted in (i,x) and (i,xy) reactions. The incoming (i) and outgoing (x,y) particles can be neutrons, protons, deuterons, tritons, helium-3 or alpha particles.

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4. METHOD OF SOLUTION

The master equations of the exciton (pre- equilibrium Griffin) model describing the equilibration of the composite nucleus are solved exactly by a matrix method up to t = infinite.
In this way, pre-equilibrium as well as equilibrium features of a reaction are taken into account. Particle spectra are interpreted without adding any extra evaporative component.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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6. TYPICAL RUNNING TIME

Compilation with FTN compiler, OPTN=2, takes 7.9 seconds. The sample problem which computes the reaction FE54 + p (28.8 MeV) taking into account 6 simple and 5 double reactions takes 25.4 seconds on the CDC 7600.

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7. UNUSUAL FEATURES OF THE PROGRAM

The program is capable of carry- ing out an improved pre-equilibrium calculation that predicts the absolute values of the energy differential cross sections without having to superimpose any evaporative component. The artificial time subdivision previously introduced between the pre-equilibrium and equilibrium parts of a reaction have been removed.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NEA-0675/01	24-FEB-1981	Tested at NEADB

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10. REFERENCES:

NEA-0675/01, included references:

- O. Bersillon and L. Faugere:
  "AMALTHEE: A FORTRAN Code for Spectra and Cross Section
   Calculations within the Exciton Model"
  NEANDC(E) 191"L", INDC(FR) 26/L (October 1977).
- L. Faugere and O. Bersillon:
  A New Approach for Interpreting Nuclear Spectra within a
  Preequilibrium Model
  NEANDC(E) 184"L", INDC(FR) 18/L.

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11. MACHINE REQUIREMENTS:
Memory requirement on CDC 7600 is 55,000 words.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0675/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: SCOPE 2.1.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Single
precision (60 bits/word) is used except for matrix calculation which is done in double precision. No special CDC programming instruction is used except PROGRAM in the first card.

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15. NAME AND ESTABLISHMENT OF AUTHOR

O. Bersillon and L. Faugere
Service de Physique Nucleaire
Centre d'Etudes de Bruyeres les Chatel
B.P. 561
92542 Montrouge Cedex (France).

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16. MATERIAL AVAILABLE

NEA-0675/01

File name	File description	Records
NEA0675_01.001	AMALTHEE SOURCE (FORTRAN)	2611
NEA0675_01.002	S.P. INPUT	177
NEA0675_01.003	S.P. OUTPUT	2654
NEA0675_01.004	JCL AND INFORMATION	21

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17. CATEGORIES

A. Cross Section and Resonance Integral Calculations

Keywords: nuclear models, particle interactions, precompound-nucleus emission.