Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Structure and Dynamics of Nuclei II
HK 7.4: Talk
Monday, March 30, 2020, 17:30–17:45, J-HS H
Constraining 0νββ-decay nuclear matrix elements with NRF* — •J. Kleemann1, T. Beck1, U. Friman-Gayer1, N. Pietralla1, V. Werner1, S. Finch2, J. Kotila3, FNU Krishichayan2, B. Löher1, H. Pai1,4, O. Papst1, W. Tornow2, M. Weinert5, and A. Zilges5 — 1IKP, TU Darmstadt — 2TUNL, Duke University, Durham NC, USA — 3University of Jyväskylä, Finland — 4SINP, Kolkata, India — 5IKP, Universität zu Köln
The search for neutrinoless double beta (0νββ) decay, a process only allowed if the neutrino is a Majorana particle, recently gained much attention with numerous experiments being dedicated to it. While the neutrino mass could be determined from its decay rate, to do so a nuclear matrix element (NME) is required, which has to be calculated using nuclear structure models. To constrain such calculations for the 0νββ-decay of 150Nd to 150Sm new data on the decay characteristics of the scissors mode of these nuclei was recently taken in nuclear resonance fluorescence (NRF) experiments performed at the High Intensity γ-ray Source at Duke University. The decay characteristics of the scissors mode are sensitive to the nuclear deformation and allow inducing constraints on model parameters, especially the Majorana parameters of the Interacting Boson Model 2 (IBM-2), in turn resulting in a more reliable prediction of the 0νββ-NME [1]. The experimental results and updated IBM-2 calculations will be presented and discussed.
[1] J. Beller et al. Phys. Rev. Lett. 111, 172501 (2013)
*Supported by the DFG through the research grant SFB 1245 and by the State of Hesse under the LOEWE grant Nuclear Photonics.