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Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Kernphysik / Spektroskopie

HK 18.7: Vortrag

Dienstag, 13. März 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 Wambach11Institut 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.

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