Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Structure and Dynamics of Nuclei V

HK 32.5: Talk

Wednesday, March 29, 2017, 18:00–18:15, F 33

Finite-size effects of nuclei - Transitions from the scissors mode to the γ-vibrational band of ¹⁶⁴Dy ⋆ — •Tobias Beck¹, Udo Gayer¹, Johann Isaak^2,3, FNU Krishichayan⁴, Bastian Löher^1,2, Norbert Pietralla¹, Deniz Savran², Werner Tornow⁴, and Markus Zweidinger¹ — ¹IKP, TU Darmstadt — ²GSI, Darmstadt — ³RCNP, Osaka, Japan — ⁴Duke University, Durham, NC, USA

The understanding of collective phenomena of nuclei is attempted by a variety of theoretical models of microscopic, geometrical, and algebraic nature. In the algebraic Interacting Boson Model effects based on the finite size of the quantum system are predicted which are not incorporated in geometrical models. The observation of electromagnetic transitions between the isovector, low-lying J_K^π=1₁⁺ scissors mode and the 2_γ⁺ state provides a sensitive test of finite-size effects. A photon-scattering experiment with linearly-polarized quasi monoenergetic γ^→-rays has been performed at the High Intensity γ-ray Source (HIγS) at Duke University, Durham, NC, exploiting the γ³ setup. We have unambiguously identified the 1_sc⁺→2_γ⁺ transition from γγ-coincidences, extracted the decay branching ratio and compared it to IBM-2 predictions. First results will be presented along with the ongoing analysis.
⋆ Supported by the DFG under grant nos. SFB 634 and SFB 1245 and by the Alliance Program of the Helmholtz Association under grant no. HA216/EMMI.