Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Structure and Dynamics of Nuclei VII
HK 28.1: Gruppenbericht
Dienstag, 15. März 2016, 16:30–17:00, S1/01 A04
The low-lying collective multipole response of atomic nuclei — •Mark Spieker1, Vera Derya1, Andreas Hennig1, Pavel Petkov1,2,3, Simon G. Pickstone1, Sarah Prill1, Vera Vielmetter1, Michael Weinert1, Julius Wilhelmy1, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne, Cologne (Germany) — 2INRNE, Bulgarian Academy of Sciences, Sofia (Bulgaria) — 3National Institute for Physics and Nuclear Engineering, Bucharest (Romania)
We present experimental results on the low-lying multipole response, which were obtained with the recently established DSA-method in Cologne [1]. Nuclear level lifetimes in the sub-ps regime are extracted by means of centroid-shifts utilizing the (p,p′γ) reaction at the 10 MV FN-Tandem accelerator in Cologne [1,2]. The scattered protons are coincidently detected with the deexciting γ rays using the SONIC@HORUS detector array, which allows for a precise determination of the reaction kinematics. In addition to the pioneering results on octupole and hexadecapole mixed-symmetry states of 96Ru [2], this contribution will feature new results on low-lying quadrupole-octupole coupled states and on the low-lying E2 strength of 112,114Sn, which was recently discussed to be generated due to a quadrupole-type oscillation of the neutron skin against the isospin-saturated core [3]. Supported by the DFG (ZI-510/7-1). M.S., S.G.P., S.P., and J.W. are supported by the Bonn-Cologne Graduate School of Physics and Astronomy. [1] A. Hennig et al., NIM A 758, 171 (2015), [2] A. Hennig et al., PRC 90, 051302(R) (2014), [3] M. Spieker et al., PLB 752, 102 (2016)