Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.13: Poster
Wednesday, March 16, 2016, 18:30–20:30, S1/05 22-24
Sensitive lifetime measurement of excited states of 98Ru via the (p,p′γ) reaction — •Vera Vielmetter1, Andreas Hennig1, Vera Derya1, Pavel Petkov1,2,3, Simon G. Pickstone1, Sarah Prill1, Mark Spieker1, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne — 2INRNE, Bulgarian Academy of Sciences, Sofia — 3National Institute for Physics and Nuclear Engineering, Bucharest-Magurele
The one-phonon mixed-symmetry quadrupole excitation 2ms+ is a well established excitation mode in near-spherical nuclei, especially in the A≈ 100 mass region [1]. However, it is largely unknown how mixed-symmetry states evolve along shape-transitional paths, e.g. from spherical to deformed shapes. The chain of stable ruthenium isotopes is well suited for this study since it exhibits a smooth transition from spherical (96,98Ru) to deformed shapes (104Ru). To identify the 2ms+ state of 98Ru on the basis of absolute M1 and E2 transition strengths, we performed a proton-scattering experiment on 98Ru using the SONIC@HORUS setup at the University of Cologne. Lifetimes of excited states were measured via the Doppler-shift attenuation method (DSAM), which benefits from the acquired pγ-coincidence data [2]. First results of this experiment are presented and compared to the neighbouring nuclei 96Ru and 100Ru. Supported by the DFG (ZI-510/7-1). S.G.P., S.P., M.S. are supported by the Bonn-Cologne Graduate School for Physics and Astronomy.
[1] N. Pietralla et al., Prog. Part. Nucl. Phys. 60 (2008) 225.
[2] A. Hennig et al., Nucl. Instr. and Meth. A 794 (2015) 717.