Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Struktur und Dynamik von Kernen - Poster

HK 33.2: Poster

Mittwoch, 23. März 2011, 14:00–16:00, Foyer Chemie

Quadrupole Transitions in ¹²⁴Sn by Means of the (α, α′ γ) Reaction — •Mark Spieker¹, Janis Endres¹, Muhsin N. Harakeh^2,3, Deniz Savran^4,5, Heinrich J. Wörtche², and Andreas Zilges¹ — ¹Institut für Kernphysik, Universität zu Köln — ²KVI, University of Groningen, The Netherlands — ³GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — ⁴ExtreMe Matter Institute EMMI and Research Division, GSI, Darmstadt — ⁵Frankfurt Institute for Advanced Studies FIAS, Frankfurt am Main

We report on an experiment at the KVI in Groningen using the AGOR facility, the magnetic spectrometer BBS, and HPGe detectors. The excitation and decay energies of the semi-magic nucleus ¹²⁴Sn have been measured in coincidence by means of the (α, α′ γ) reaction at E_α = 136 MeV [1]. We closely looked at hadronic reactions, especially considering inelastic scattering. Because strong quadrupole transitions into the ground state could be observed, we focus in this work on the decay of 2⁺ states by γ-ray emission. We were able to determine the double-differential cross sections as well as the single α-scattering cross sections for almost all known 2⁺ states up to the particle threshold in ¹²⁴Sn. In addition, we observed possible new branchings.
Supported by the DFG (ZI 510/4-1 und SFB 634), EURONS, the Bonn-Cologne Graduate School of Physics and Astronomy, and by the Alliance Program of the Helmholtz Association (HA216/EMMI).

[1] J. Endres et al., Phys Rev. Lett. 105 (2010) 212503.