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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Structure and Dynamics of Nuclei IV

HK 31.8: Vortrag

Mittwoch, 29. März 2017, 18:30–18:45, F 2

Constraining nuclear matrix elements for 0 ν β β decay between ⁸²Se and ⁸²Kr* — •Udo Gayer¹, T. Beck¹, J. Kleemann¹, Fnu Krishichayan³, B. Löher², O. Papst¹, N. Pietralla¹, P. C. Ries¹, D. Savran², W. Tornow³, and V. Werner¹ — ¹Institut fuer Kernphysik, TU Darmstadt, Darmstadt, Germany — ²GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, Darmstadt, Germany — ³Duke University, Durham NC, USA

The nuclei ⁸²Se and ⁸²Kr are candidates for the hypothetic exotic neutrinoless double-beta (0 ν β β) decay process, and a precise knowledge of their nuclear structure is necessary to estimate decay rates [1] and - should it be detected - to extract neutrino masses from this quantity. In a study of Gd isotopes [2], a connection between the decay behavior of the M1 scissors mode and 0 ν β β decay rates was established. We intend to study decay properties of low-lying magnetic dipole excitations in the 0 ν β β candidates ⁸²Se and ⁸²Kr in nuclear resonance fluorescence experiments with quasi-monochromatic, polarized photons at the High-Intensity Gamma-Ray Source (HIγS) in Durham, NC, USA. In a first experiment, the γ³ setup [3] was used to identify magnetic dipole states of ⁸²Se and to study branching transitions. Preliminary results of this experiment will be presented and discussed.
*Supported by DFG research grant CRC 1245
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J. Beller et al., Phys. Rev. Lett. 111 (2013) 172501
B. Löher et al., NIMA 723 (2013) 136-142