SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 69: Structure and Dynamics of Nuclei XIV
HK 69.1: Vortrag
Donnerstag, 23. März 2023, 15:45–16:00, SCH/A118
Investigation of neutron-induced γ rays from Ge-nuclides in the region of interest of GERDA/LEGEND — •Marie Pichotta1, Toralf Döring1,2, Hans F. R. Hoffmann1, Konrad Schmidt2, Ronald Schwengner2, Steffen Turkat1, Birgit Zatschler1,3, and Kai Zuber1 — 1Technische Universität Dresden (IKTP), Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Germany — 3University of Toronto, Canada
GERDA has been a pioneering experiment in the search for the still undetected neutrinoless double beta (0νββ)-decay of 76Ge and this will also hold for the successor experiment LEGEND. The discovery of this extremely rare process would prove the Majorana character of
neutrinos and consequently physics beyond the Standard Model. For an explicit identification of a signal caused by the 0νββ-decay, which correspond to an energy of 2039 keV for 76Ge, a precise understanding of all background contributions in the ROI is crucial.
However, previous experiments indicated γ lines produced by neutron activation (n,p) and neutron scattering (n,n’) processes on 76Ge and 74Ge but until now, their existence could not be confirmed adequately. In this experiment an enriched Ge-sample was alternately irradiated by 14 MeV neutrons from a DT generator and measured by an optimized HPGe detection setup. The γ spectrum of 51 irradiation cycles shows three peaks in the energy region around 2039 keV which means that germanium itself can contribute to potential background in all 76Ge 0νββ-decay experiments such as LEGEND and GERDA. The experimental procedure and the results will be presented.