Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Struktur und Dynamik von Kernen I

HK 3.6: Vortrag

Montag, 21. März 2011, 15:30–15:45, O-1

RDDS lifetime measurements of yrast states in ¹⁸⁶Hg — •Matthias Hackstein¹, Alfred Dewald¹, Tuomas Grahn^2,3, Marcus Scheck^3,4, Christoph Fransen¹, Thomas Braunroth¹, Nick Bree⁵, Peter Butler³, Mike Carpenter⁶, Robert Carroll³, Christopher Chiara^6,7, Piet van Duppen⁵, Fay Filmer³, Liam Gaffney³, Robert Janssens⁶, Jan Jolie¹, Rauno Julin², Mark Huyse⁵, Filip Kondev⁶, Torben Lauritsen⁶, Kim Lister⁶, Julia Litzinger¹, Paivi Nieminen², Janne Pakarinen⁸, Thomas Pissulla¹, Sarah Rigby³, Wolfram Rother¹, Karl-Oskar Zell¹, Heidi Watkins³, and Shaofei Zhu⁶ — ¹IKP, U. of Cologne, Germany — ²U. of Jyväskylä, Finland — ³Oliver Lodge Laboratory, U. of Liverpool, UK — ⁴IKP, TU Darmstadt, Germany — ⁵KU Leuven, Belgium — ⁶Argonne National Laboratory, U.S.A. — ⁷U. of Maryland, U.S.A. — ⁸CERN, Switzerland

In light, even-mass Hg isotopes, a weakly deformed oblate ground state band is found to coexist with a more deformed prolate band. To investigate the nuclear structure in more detail a recoil-distance Doppler-shift (RDDS) experiment has been performed to determine absolute transition strengths in ¹⁸⁶Hg. These transition strengths provide information on the level mixing amplitudes of the two involved collective excitations. The experiment was carried out using the GAMMASPHERE HPGe-Array at the Argonne National Laboratory and the Cologne coincidence Plunger, equipped with a Ta-backed ¹⁵⁰Sm target and a gold stopper foil. The beam was ⁴⁰Ar at 184 MeV. We will present first results of the experiment. Supported by DFG, DE 1516/1-1