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HK: Physik der Hadronen und Kerne

HK 48: Plenarsitzung

HK 48.3: Invited Talk

Friday, March 23, 2001, 09:30–10:00, P

Selected electromagnetic processes in three-nucleon systems — •Jacek Golak — Institut für Theoretische Physik II, Ruhr Universität Bochum, 44780 Bochum, Germany — Institute of Physics, Jagellonian University, PL 30059 Cracow, Poland

The central dynamical ingredient for electromagnetic processes in three-nucleon systems is the nuclear current operator. It consists of a single nucleon part and more than one-nucleon parts. Due to the spin structure of the ³He wave function, polarized ³He targets are used as effective neutron targets with the aim to extract the magnetic (G_Mⁿ) and electric (G_Eⁿ) neutron form factors at certain q² values. In order to obtain reliable information about those quantities, final state interaction among the three nucleons has to be taken into account. We show how this is done within our framework based on Faddeev solutions for the three-nucleon continuum and the three-nucleon bound states belonging to the same three-nucleon Hamiltonian. We present an analysis of a recent experiment [1] on the process ³He(e^→,e′), Modern realistic nucleon-nucleon forces and mesonic exchange currents are incorporated in the analysis.

Within the same framework we investigate the proton-deuteron radiative capture process at various energies. The application of the Siegert theorem is compared to the explicit use of pi- and rho-like exchange currents connected to different nucleon-nucleon potentials.

[1] W. Xu et al., Phys. Rev. Lett. 85, 2900 (2000)