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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Structure and Dynamics of Nuclei III

HK 18.3: Talk

Tuesday, February 27, 2018, 14:45–15:00, HZO 70

Nuclear structure of 82Se and 82Kr relevant for 0ν β β decay — •Udo Gayer1, Tobias Beck1, Jörn Kleemann1, FNU Krishichayan2, Bastian Löher1, Oliver Papst1, Norbert Pietralla1, Philipp Christian Ries1, Deniz Savran3, Michael Weinert4, Werner Tornow2, and Volker Werner11IKP, TU Darmstadt — 2Duke University, Durham NC, USA — 3GSI, Darmstadt — 4IKP, Universität zu Köln

The nuclei 82Se and 82Kr are candidates for the hypothetical neutrinoless double-beta (0 ν β β) decay process, and a precise knowledge of their nuclear structure is necessary to estimate decay rates and extract neutrino properties from a possible observation. Therefore, we have studied the decay properties of low-lying dipole excitations up to 4.2 MeV in both isotopes in a nuclear resonance fluorescence experiment with quasi-monoenergetic, polarized photons at the High-Intensity Gamma-Ray Source (HIγS). The experiment used the γ3 setup [1] and a second setup with four HPGe detectors for a simultaneous measurement of 82Se and 82Kr. In this energy range, several dipole excitations were newly identified, and their relative excitation strengths were estimated from nonresonant scattering off the targets. Transitions of 1+ scissors mode states to lower-lying excited states with branching ratios as low as 1 % were observed, which can give an insight into shape coexistence effects [2]. Results of the experiment will be presented and interpreted.
*Supported by DFG research grant SFB 1245
B. Löher et al., NIMA 723 (2013) 136-142
J. Beller et al., Phys. Rev. Lett. 111 (2013) 172501

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