RSIC CODE PACKAGE PSR-338
1. NAME AND TITLE
DWBA07/DWBB07: Code System for Inelastic and Elastic Scattering
with Nucleon-Nucleon Potential.
Service de Physique Theorique, CEN Saclay, France, through the OECD NEA Data Bank, Issy-les-Moulineaux, France.
3. CODING LANGUAGE AND COMPUTER
Fortran, Linux-based PC, Windows PC (P00338MNYCP01).
NEA Package ID: NEA-1209/008.
4. NATURE OF PROBLEM SOLVED
The DWBA07/DWBB07 codes calculate elastic and inelastic nuclear scattering described by a two-body interaction which can depend on the nuclear density. DWBB07 can compute any observable for any non zero-spin target, combining the results obtained by DWBA07 for different spin transfers.
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 the test case, the difference for the total cross-section was less than 0.2%. Improvements were made to improve portability using various compilers. The name of the program has also been changed to DWBA07/DWBB07 to indicate these corrections. The code structure and some subroutines are the same as that used in ECIS06.
5. 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.
6. RESTRICTIONS OR LIMITATIONS
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.
7. TYPICAL RUNNING TIME
The test problems included in the package require between 2 and 15 minutes CPU time.
8. COMPUTER HARDWARE REQUIREMENTS
The codes run on personal computers.
9. COMPUTER SOFTWARE REQUIREMENTS
DWBA07/DWBB07 runs on personal computers under Linux or in a DOS window under Windows XP. The package does not include any executables, so a Fortran compiler is required on all computers. The NEADB tested the codes under Linux Red Hat CentOS release 4.2 with the Lahey/Fujitsu Fortran 95 Compiler Release L6.20a. They tested the Windows version using Intel Visual Fortran Professional Edition Version 9.
RSICC tested on Pentium IV PC running Microsoft® Windows XP™ and Windows Vista™ with Lahey-Fujitsu Fortran95 v5.60a and Compaq Digital Visual Fortran 6.6C. They tested the Linux version on Intel Pentium running Fedora8 with 32-bit GCC 3.4.6 g77 & GCC 4.1.2 g95, on an AMD Opteron running Red Hat Enterprise Linux 4 with pgf95 vers 6.1-6 and on an AMD Athlon running RHEL4 with GCC 3.4.6-3 g77 & GCC 4.0.3 g95.
10.a included in documentation:
J. Raynal, “Notes on the DWBA98/DWBB98” (19 November 1999).
J. Raynal, “DWBA05”, 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).
10.b background references:
J. Raynal, “Spin-orbit transition interactions,” Phys. Rev. C 71, 057602 (2005) DOI.).
11. CONTENTS OF CODE PACKAGE
Included are the referenced documents in 10.a and a CD which contains the source codes, sample problem input/output, and data files.
12. DATE OF ABSTRACT
October 1993, revised April 2008.
KEYWORDS: CROSS SECTIONS; NUCLEAR MODELS