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HK: Physik der Hadronen und Kerne

HK 19: Nuclear Structure/Spectroscopy III

HK 19.6: Vortrag

Dienstag, 9. März 2004, 17:15–17:30, D

Spectral Statistics of the Fine Structure of the Electric Pygmy Dipole Resonance in N = 82 Nuclei^* — •A. Heine¹, J. Enders¹, T. Guhr², P. von Neumann-Cosel¹, V.Yu. Ponomarev¹, A. Richter¹, S. Volz¹, and J. Wambach¹ — ¹Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — ²Matematisk Fysik, LTH, Lunds Universitet, SE-22100 Lund, Sweden

We present the first statistical analysis of the fine structure of the electric pygmy dipole resonance. To this extent we analyzed a data set composed of 184 E1 transitions (levels and strengths) measured in the semimagic N = 82 isotones ¹³⁸Ba, ¹⁴⁰Ce, ¹⁴²Nd, and ¹⁴⁴Sm [1]. Microscopic calculations performed within the quasiparticle-phonon model (QPM) serve to understand the experimental findings. By taking the effects of the incompleteness of the experimental data into account, qualitative agreement between experiment and QPM can obtained for the level as well as the intensity statistics. [1] A. Zilges et al., Phys. Lett. B 542 (2002) 43.
^*Supported by DFG under contract SFB 634.