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HK: Hadronen und Kerne

HK 5: Kernspektroskopie, schwere Kerne I

HK 5.3: Vortrag

Montag, 24. März 1997, 14:45–15:00, HS F

Collective excitations in hot nuclear matter — •U. Fuhrmann, K. Morawetz, and G. Roepke — AG Quantentheorie und Vielteilchensysteme, FB Physik, Universitaet Rostock, Universitaetsplatz 3, D-18051 Rostock

Collective excitations in hot nuclear matter are investigated. The Giant dipole resonance (GDR) is described using the dielectric function (DF) in random phase approximation (RPA). Analytical continuation of the DF into the lower energy half plane allows us to compute the frequencies and damping rates of GDR. With an extended appproach using a conserving relaxation time approximaion to include collision effects, different contributions to the damping of GDR in ^108−112Sn und ²⁰⁸Pb will be discussed and compared with recent experimental data.