# Darmstadt 2016 – wissenschaftliches Programm

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# HK: Fachverband Physik der Hadronen und Kerne

## HK 51: Structure and Dynamics of Nuclei X

### HK 51.4: Vortrag

### Donnerstag, 17. März 2016, 14:45–15:00, S1/01 A03

**Study of the neutron deficient nucleus **^{180}**Pt** — •Claus Müller-Gatermann^{1}, Christoph Fransen^{1}, Alfred Dewald^{1}, Thomas Braunroth^{1}, Julia Litzinger^{1}, Jan Jolie^{1}, Karl-Oskar Zell^{1}, Rauno Julin^{2}, Tuomas Grahn^{2}, and Pavel Petkov^{3} — ^{1}Institut für Kernphysik, Universität zu Köln, Deutschland — ^{2}Dept. of Physics, University of Jyväskylä, Finnland — ^{3}Bulgarian Academy of Sciences, Sofia, Bulgarien

The nuclei ^{176, 178, 180}Os are known to show the characteristic features of the critical point symmetry X(5). This symmetry was introduced by F. Iachello and describes nuclei at the critical point of deformation phase transition from a vibrator to axial rotor. A rapid change in deformation is expected when the proton number is changed, because the neutron number is close to mid-shell. Therefore we performed measurements to determine the lifetimes of low lying states in ^{180}Pt which is a neighbor of the X(5) type Os nuclei, from which absolute transition probabilities can be deduced directly.
In this contribution we will report on a Recoil distance Doppler shift experiment which was performed at the JYFL, Jyväskylä (Finland). Furthermore the results of the ^{168}Yb(^{16}O,4n)^{180}Pt experiment using the fast timing technique to determine the lifetime of the rather longlived first 2+ state at the IKP, University of Cologne (Germany) will be presented.
The experimental results will be discussed in the framework of the Interacting Boson Model and compared to a General Collective Model calculation.
Supported by the Project ENSAR in the seventh framework programme, and the DFG under contract number DE 1516/3-1 and JO 391/16-1