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NEA-1209 DWBA07/DWBB07.

DWBA07/DWBB07, elastic scattering with nucleon-nucleon potential and DWBA for inelastic scattering

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1. NAME OR DESIGNATION OF PROGRAM:  DWBA07/DWBB07.
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2. COMPUTERS
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Program name Package id Status Status date
DWBA07/DWBB07 NEA-1209/08 Tested 04-OCT-2007

Machines used:

Package ID Orig. computer Test computer
NEA-1209/08 Linux-based PC Linux-based PC,PC Windows
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3. DESCRIPTION OF PROGRAM OR FUNCTION

Elastic and inelastic nuclear scattering described by a two-body interaction which can depend on the nuclear density. DWBB07 allows to compute any observable for any non zero-spin target, combining the results obtained by DWBA07 for different spin transfers.
NEA-1209/08
NEW VERSION DIFFERS FROM PREVIOUS VERSION IN THE FOLLOWING FEATURES
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The present version corrects DWBA05/DWBB05 for which the exchange term of the two-body Coulomb interaction was absent.
In the previous version, when computing single particle-hole contributions,
to be used with DWBB, the first four phase-shifts of the last particle-hole calculation were wrong. In our test case, the difference for the total cross-section was less than 0.2%. The name of the program has also been changed to DWBA07/DWBB07 to indicate these corrections.
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4. METHOD OF SOLUTION

The distorted wave Born approximation is used to describe the inelastic scattering on a zero-spin target to a state known by its particle-hole description. Besides the optical model, DWBA07 includes a fully microscopic non local optical model obtained with the description of the target by its occupation numbers and with the two-body interaction for the initial and final distorted waves. The effective interaction can be the one obtained by fitting some nucleon-nucleon potential or nucleon-nucleon elastic scattering. This effective interaction may comprise central, spin-orbit, tensor, L**2 and (LS)**2 operator components with Yukawa form factors and complex density dependent strengths.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The M1 electromagnetic transition is out of the scope of DWBA07 because it is not included in the nucleon-nucleon interaction taken into account. On the contrary, the El transition is an effective part of the Coulomb interaction as considered in this code.
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6. TYPICAL RUNNING TIME

The test problems included in the package require between 2 and 15 minutes CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM

In order to keep the non-local potential (for the calculation of the incoming and outgoing wave) a large scratch data set can be used (default logical unit 8).
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8. RELATED AND AUXILIARY PROGRAMS

DWBB07 allows to compute any observable for any non zero-spin target, combining the results obtained by DWBA07 for different spin transfers. With respect to DWBB98, the possibility to combine results of DWBA07 obtained for single particle-hole excitations can be used to study different excited states at about the same energy.
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9. STATUS
Package ID Status date Status
NEA-1209/08 04-OCT-2007 Tested at NEADB
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10. REFERENCES

- RAYNAL J. Multipole expansion of a two-body interaction in helicity
formalism and its applications to nuclear structure and nuclear reaction
calculations Nucl. Phys. A 97, 572-592 (1967).
- RAYNAL J. Spin-orbit interaction in the inelastic nucleon scattering
'The Structure of Nuclei' pp. 75-116 (IAEA, Vienna, 1972)
International Course on Nuclear Theory, Trieste, Italie,
January 13 - March 12 1971
- K. Amos, P.J. Dortmans, H.V. von Geramb, S. Karatiglidis, J. Raynal
Nucleon-Nucleus Scattering: A Microscopic Nonrelativistic Approach
NEGELE J.W., VOGT E.W., eds. (Kluwer Academic/Plenum Publishers)
Adv. Nucl. Phys. 25, 275-540 (2000)
- J. Raynal:
Spin-orbit transition interactions Phys. Rev. C 71, 057602 (2005) DOI
NEA-1209/08, included references:
- J. Raynal:
Notes on the DWBA98/DWBB98 (19 November, 1999)
- J. Raynal:
DWBA05
in: Proceedings of the P(ND)**2 Workshop (Perspectives on Nuclear Data for the
Next Decade), CEA/DIF, Bruyeres-le-Chatel, France, September 26-28 2005 (2005)
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11. MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1209/08 FORTRAN
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS and UNIX.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHORS

           Jacques Raynal
           4 rue du Bief
           91380 Chilly-Mazarin (France)
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16. MATERIAL AVAILABLE
NEA-1209/08
DWBA07 Fortran source files
DWBA07 test problems
DWBA07 test problems input and output
PDF files on DWBA05 and NOTES ON DWBA98/DWBB98
DWBB07 Fortran source files
DWBB07 test problems
DWBB07 test problems input and output
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: angular distribution, cross sections, distorted wave born approximation, distorted wave theory, nuclear models.