Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 45: Nuclear Physics / Spectroscopy VII

HK 45.5: Vortrag

Donnerstag, 14. März 2002, 17:30–17:45, B

Structure of excited K^π=0⁺ bands in ¹⁶⁸Er. — •A. Linnemann¹, J. Jolie¹, H.G. Börner², M. Jentschel², and P. Mutti² — ¹Institut für Kernphysik, Universität zu Köln — ²Institut Laue-Langevin,38042 Grenoble, France

In order to investigate the character of excited K^π=0⁺ bands, that can be interpreted as β- or γγ-bands, the knowledge of absolute decay rates is mandatory. We have studied the second excited K^π=0⁺ band in ¹⁶⁸Er using neutron capture on ¹⁶⁷Er and the γ-ray-induced Doppler-boardening technique (GRID) to measure the lifetimes. The experiment was performed at the double-flat-crystal spectrometer GAMS4 installed at the Laue-Langevin (ILL) in Grenoble. The lifetimes of the 2₄⁺ state at 1493 keV and the 4₄⁺ state at 1656 keV could be measured for the first time. The collectivity of this band can be studied using the absolute transition rates.