PSR-0010 EVAP-4

EVAP-4, Particle Evaporation from Excited Nuclei

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHODS, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES, RELATED OR AUXILIARY PROGRAMS, STATUS, REFERENCES, HARDWARE REQUIREMENTS, LANGUAGE, SOFTWARE REQUIREMENTS, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: EVAP-4.

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2. COMPUTERS

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Program name	Package id	Status	Status date
EVAP-4	PSR-0010/01	Arrived	09-MAR-2001

Machines used:

Package ID	Orig. computer	Test computer
PSR-0010/01	IBM 360 series

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3. DESCRIPTION OF PROGRAM OR FUNCTION

EVAP calculates the types, multiplicities, and energy distributions of particles evaporated from excited compound nuclei. The version in this package calculates the excitation energy of the compound nucleus from the data furnished for the target nucleus and incident particle; other versions are packaged with Bertini's intranuclear cascade code (CCC-46/LEP) which accept instead the output from a cascade calculation to determine the initial conditions for the evaporation. Other than the determination of these initial conditions, both versions are identical.

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4. METHODS

The evaporation process is started with the
collision of an incident particle with a target nucleus. An excited compound nucleus is formed from which particles are emitted until evaporation is no longer energetically possible.
The calculation is based on a theory originally proposed by
Weisskopf [Phys. Rev. 52 (1937) 295], and on a Monte Carlo code written by Dostrovsky [Phys. Rev. 116. (1959) 683; Phys. Rev. 118 (1960) 781, 791].

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM: None noted

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6. TYPICAL RUNNING TIME

No study has been made by RSICC of typical running times for EVAP.

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7. UNUSUAL FEATURES: None noted

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8. RELATED OR AUXILIARY PROGRAMS

An early version of EVAP is also packages with CCC-7/NTC and with CCC-47/LEP. This version, EVAP-4, represents the latest modification and extension of the original program. It is identical to EVAP-3 in all respects except that an "improved-termination" procedure has been added.

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9. STATUS

Package ID	Status date	Status
PSR-0010/01	09-MAR-2001	Masterfiled Arrived

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10. REFERENCES

- L. Dresner
  EVAP - A Fortran Program for Calculating the Evaporation of
  Various Particle Evaporation from Excited Nuclei.
  ORNL-TM-196 (1961)

PSR-0010/01, included references:

- P.A. Seeger;
  Changes to Subroutine DRES
  Informal note (June 1974)
- M.P. Guthrie
  Another Modification of a Code to Calculate Particle Evaporation
  from Excited Compound Nuclei
  ORNL-TM-3119 (September 1970)
- M.P. Guthrie
  EVAP-2 and EVAP-3: Modifications of a Code to Calculate
  Particle Evaporation from Excited Compound Nuclei
  ORNL-4379 (March 1969)
- Corrections in the DRES Subroutine of the EVAP Codes
(April 1971)

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11. HARDWARE REQUIREMENTS

EVAP was designed for and is operable on the IBM 360 computer.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
PSR-0010/01	FORTRAN-IV

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13. SOFTWARE REQUIREMENTS: A Fortran IV compiler is required.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by:
                Radiation Safety Information Computational                                 Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

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16. MATERIAL AVAILABLE

PSR-0010/01

DATTP F01 EVAP Tables
SRCTP F02 Function FLRN
SRCTP F03 EVAP-4 source
DATTP F04 DD cards and data
OUTTP F05 EVAP-4 output
NOTPTChanges to subroutine DRES, Informal Note (June 1974)
REPPTORNL-TM-3119 (September 1970)
REPPTORNL-4379 (March 1969)
NOTPTCorrections in the DRES subroutine of the EVAP codes (April 1971)

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17. CATEGORIES

A. Cross Section and Resonance Integral Calculations

Keywords: compound nuclei, evaporation model, nuclear models, nuclear reactions.