last modified: 20-APR-1994 | catalog | categories | new | search |

PSR-0302 COMNUC3B.

COMNUC3B, Gamma Emission, Neutron Emission Fission and Scattering Cross-Sections Using Hauser-Feshbach

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1. NAME OR DESIGNATION OF PROGRAM:  COMMUC3B (A Compound Nucleus
Analysis Program).
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2. COMPUTERS
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Program name Package id Status Status date
COMNUC3B PSR-0302/01 Tested 20-APR-1994

Machines used:

Package ID Orig. computer Test computer
PSR-0302/01 CRAY X-MP CRAY X-MP
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3. DESCRIPTION OF PROGRAM OR FUNCTION

COMMUC3B was written to analyze compound nucleus interactions. Only reactions for which the incident particle is a neutron are considered.
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4. METHOD OF SOLUTION

When the outgoing particle is a neutron, two types of reactions are considered. The first occurs when the target  is left in a well-defined excited state. The other occurs when the target nucleus is left in one of many excited levels. These reaction types are known as individual channel inelastic and continuum inelastic respectively. The individual channel model is described by the known levels of the target nucleus. The continuum inelastic neutron calculation requires a model for the nuclear level density and a set of spin, parity, and energy dependent transmission coefficients. These two functions are convoluted for energies greater than the last identified target level. As with emerging neutrons, the fission component is separated into two parts: a part  due to discrete channels and a part due to fission through a continuum of states.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum number of levels for the individual channel model which can be specified is twenty.
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6. TYPICAL RUNNING TIME

The code was tested on a Cray XMP under the CTSS operating system. The sample problem took 9 seconds of CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
PSR-0302/01 20-APR-1994 Tested at NEADB
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10. REFERENCES:
PSR-0302/01, included references:
- C.L. Dunford:
  Compound Nucleus Reaction Analyis Programs COMNUC and CASCADE
  T1-707-130-013 Atomics International (Jan. 19, 1971).
- Input Description for FTNCOMNUC
  Los Alamos Informal Notes (October 1980).
- Card Input for COMNUC8D
  Los Alamos Informal Notes (October 1980).
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11. MACHINE REQUIREMENTS:  The code will run on the Cray computers.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
PSR-0302/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The code is written in FORTRAN IV. On the Cray, the compiler used was CFT under  the CTSS operating system.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

Los Alamos National Laboratory
Los Alamos
New Mexico, U.S.A.

Atomics International
North American Rockwell
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16. MATERIAL AVAILABLE
PSR-0302/01
File name File description Records
PSR0302_01.001 Information file 54
PSR0302_01.002 JCL and control information 4
PSR0302_01.003 COMNUC3B FORTRAN 77 source program 6889
PSR0302_01.004 TAPE 10 library input 674
PSR0302_01.005 Sample problem input 110
PSR0302_01.006 Sample problem output (tape 4) 1680
PSR0302_01.007 Sample output summary (tape 2) 36
PSR0302_01.008 Logfile from sample problem 66
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: compound nuclei, neutron reactions, nuclear models.