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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Kernphysik / Spektroskopie
HK 18.7: Talk
Tuesday, March 13, 2007, 18:30–18:45, D
Spin- and Parity-Resolved Level Densities from High-Resolution Hadron and Electron Scattering Studies of Giant Resonances⋆ — •Yaroslav Kalmykov1, Karlheinz Langanke2,1, Patricio Leboeuf3, Gabriel Martínez-Pinedo2, Peter von Neumann-Cosel1, Iryna Poltoratska1, Vladimir Ponomarev1, Achim Richter1, and Jochen Wambach1 — 1Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — 2Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany — 3Université de Paris-Sud, 91405 Orsay Cedex, France
Modern
experiments allow to unravel the fine structure of giant resonances even in heavy nuclei. High
energy resolution along with excellent selectivity achieved by a proper choice of the kinematics
give a possibility to extract spin- and parity-separated level densities by means of an
autocorrelation analysis. A novel method [1] using the discrete wavelet transform provides a nearly
model-independent determination of the non-resonant background which is crucial for the
applicability of this technique. Results for 1+ states in 58Cu and 90Nb, 2− and
2+ states in 58Ni and 90Zr as well as 2+ states in a broad range of nuclei are
presented in comparison with the predictions of state-of-the-art theoretical models applied in
astrophysical network calculations. An emphasis is placed on a possible parity dependence and shell
effects in nuclear level densities.
[1] Y. Kalmykov et al.,
Phys. Rev. Lett. 96, 012502 (2006).
⋆ Supported by the DFG through SFB 634 and NE 679/2-1.