The nature of a non-locality in the nucleon-oxygen optical potential
Abstract
The cross section and polarization for nucleon Oxygen scattering has a minimum at large angles and low energies that cannot be fitted with phenomenological or microscopic local optical potentials, however it has been well fitted with a parity dependent (local) optical potential [1]. It is shown here that this parity dependence is due to channel coupling, i.e., to the dynamic excitation of the target nucleus during the scattering process, and is not due to the exchange process of the incident nucleon with the target nucleons [2], and is also not due to alpha-particle clustering in the target nucleus [3]. The argument is based on the investigation of local equivalent optical potentials in a "toy" model coupled channels calculation [4]. [1] S. G. Cooper, Nucl. Phys. A 618, 87 (1997); [2] G. H. Rawitscher, D. Lukaszek, R. S. Mackintosh and S. G. Cooper, Phys. Rev. C 49, 1621 (1994); D. Lukaszek, G. H. Rawitscher, BAPS, (1999); [3] D. Lukaszek and G. H. Rawitscher, BAPS 47, 92 (2002); [4] H. Fiedeldey, R. Lipperheide, G. H. Rawitscher and S. A. Sofianos, Phys. Rev. C 45, 2885 (1992).
- Publication:
-
APS April Meeting Abstracts
- Pub Date:
- April 2003
- Bibcode:
- 2003APS..APR.D1039L