Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 59: Structure and Dynamics of Nuclei XI
HK 59.1: Gruppenbericht
Freitag, 22. März 2019, 14:00–14:30, HS 14
High-Precision Nuclear Structure Studies for Neutrinoless Double-Beta (0ν β β) Decay — •U. Gayer1, J. Kleemann1, T. Beck1, S. Finch2, J. Isaak1, FNU Krishichayan2, B. Löher1, H. Pai3, O. Papst1, N. Pietralla1, P. C. Ries1, D. Savran4, W. Tornow2, M. Weinert5, and V. Werner1 — 1IKP, TU Darmstadt — 2TUNL, Durham, NC, USA — 3SINP, Kolkata, India — 4GSI, Darmstadt — 5IKP, Universität zu Köln
Apart from the unknown neutrino mass, the uncertainty of predicted decay rates for the 0ν β β-process is dominated by input from nuclear structure theory [1]. Our experimental campaign aimed at improving the data on electromagnetic observables of the 0ν β β-decay candidates 82Kr/82Se and 150Nd/150Sm to test theoretical models. We focused on γ-decay branches of the nuclear scissors mode (ScM), which can be determined in high-precision nuclear resonance fluorescence experiments using the γ3 setup at the High-Intensity γ-Ray Source (HIγS). Due to the isovector character of the ScM and its relation to deformation, its decay probes isovector parameters and the description of shape coexistence in nuclear models such as the Interacting Boson Model-2 [2–4]. This contribution will summarize the experimental method, present the results, and discuss the impact on predicted 0ν β β decay rates.
Supported by DFG research grant SFB 1245
[1] J. Engel, J. Menéndez, Rep. Prog. Phys. 80 (2017) 046301
[2] J. Beller et al., Phys. Rev. Lett. 111 (2013) 172501
[3] T. Beck et al., Phys. Rev. Lett. 118 (2017) 212502
[4] F. Iachello, A. Arima, Cambridge University Press (1987)