Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Struktur und Dynamik von Kernen

HK 24.1: Gruppenbericht

Dienstag, 18. März 2014, 16:30–17:00, HZ 4

Study of mixed-symmetric excitations via inelastic proton scattering — •Andreas Hennig¹, Vera Derya¹, Michael Elvers^1,2, Janis Endres¹, Andreas Heinz^2,3, Simon G. Pickstone¹, Desiree Radeck^1,2, Deniz Savran^5,6, Mark Spieker¹, Volker Werner^2,4, and Andreas Zilges¹ — ¹Institute for Nuclear Physics, University of Cologne — ²Wright Nuclear Structure Laboratory, Yale University — ³Department of Fundamental Physics, Chalmers University of Technology, Göteborg — ⁴Institute for Nuclear Physics, TU Darmstadt — ⁵Extreme Matter Institute EMMI and Research Division, GSI Darmstadt — ⁶Frankfurt Institute for Advanced Studies FIAS, Frankfurt

Mixed-symmetric excitations are particularly sensitive to the proton-neutron interaction in atomic nuclei. The stable N=52 isotones have been studied extensively in the last decade. Nevertheless, experimental information on the heaviest stable isotone, ⁹⁶Ru, is still sparse. We have performed two experiments, one at the YRAST ball spectrometer at WNSL, Yale, the other at the SONIC&HORUS spectrometer in Cologne. Predominantly low-spin excitations were populated in ⁹⁶Ru by means of inelastic proton scattering via isobaric analog resonances in both cases. The proton-γ coincidence data of the Cologne experiment allows to extract nuclear level lifetimes using the Doppler-shift attenuation method (DSAM). Therewith, mixed-symmetry excitations can be identified based on absolute transition strengths.
Supported by the DFG (ZI-510/4-2) and US DOE Grant No. DE-FG02-01ER40609.