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HK: Hadronen und Kerne
HK 63: Spectroscopy: 180 ≤ A ≤ 208
HK 63.9: Talk
Thursday, March 19, 1998, 16:00–16:15, D
Photon scattering off 204,206,208Pb up to 6.5 MeV⋆ — •J. Enders1, P. von Brentano2, J. Eberth2, A. Fitzler2, C. Fransen2, R.-D. Herzberg2, H. Kaiser1, L. Käubler3, P. von Neumann-Cosel1, N. Pietralla2, V. Yu. Ponomarev1,4, H. Prade3, A. Richter1, H. Schnare3, R. Schwengner3, S. Skoda2, H.G. Thomas2, H. Tiesler2, D. Weisshaar2, I. Wiedenhöver2, and A. Zilges1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Germany — 2Institut für Kernphysik, Universität zu Köln, Germany — 3Institut für Kern- und Hadronenphysik, FZ Rossendorf, Germany — 4Joint Institute for Nuclear Research, Dubna, Russia
We report on results of photon scattering experiments performed at the superconducting Darmstadt electron accelerator S-DALINAC. Excitation strengths and fragmentation of the dipole response in stable even-mass Pb isotopes are presented for energies up to 6.5 MeV. We discuss the results with respect to previous experiments (see e.g. [1]) as well as Quasiparticle-Phonon model calculations. Furthermore, experimental limits for the excitation strength of the 2+ member of the two-octupole-phonon quadruplet in 208Pb are given, which has recently been proposed to be accessible by nuclear resonance fluorescence experiments [2].
[1] T. Chapuran et al., Phys. Rev. C 22 (1980) 1420
[2] J. Enders et al., Nucl. Phys. A612 (1997) 239 ⋆ Supported by DFG under contracts Ri 242/12-1 and Br 799/6-2 and by BMBF under 06 OK 862 I and 06 DR 666 I.