Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 24: Electromagnetic and Hadronic Probes III
HK 24.2: Vortrag
Mittwoch, 10. März 2004, 11:15–11:30, B
Nuclear Transparencies in Relativistic A(e,e’p) Models — •Pascal Lava1, Cristina Martinez2, Jan Ryckebusch1, and Bart Van Overmeire1 — 1University Ghent, Proeftuinstraat 86,9000 Gent ,Belgium — 2Universidad de Sevilla,Apdo. 1065,E-41080 Sevilla, Spain
The transparency of the nuclear medium to nucleon propagation is of crucial importance for understanding the dynamics of nucleons and nuclei. For example, it is a well-suited quantity to look for the onset of color transparency (CT), a phenomenon which is a natural consequence of QCD.
Relativistic and unfactorized calculations for the proton transparency in exclusive A(e,e′p) reactions for 0.3 ≤ Q2 ≤ 10 GeV2 will be presented. The predictions compare favorably with the world-data for the target nuclei 12C, 56Fe and 197Au. For Q2 ≥ 1 GeV2, the transparency results are computed within the framework of the recently developed Relativistic Multiple-scattering Glauber Approximation (RMSGA) [1]. These calculations are essentially parameter free and rely on proton-nucleon scattering data. The RMSGA predictions will be compared with relativistic distorted wave calculations (RDWIA) which rely on optical proton-nucleus potentials. Despite the very different model assumptions which underlie the RMSGA and RDWIA frameworks, they predict similar transparencies for kinematic regions where both models are applicable.
[1] J. Ryckebusch, D. Debruyne, P. Lava, S. Janssen, B. Van Overmeire and T. Van Cauteren Nucl. Phys. A728 (2003) 226.