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    Evidence for neutron-induced γ-ray emissions in the vicinity of the Q value of Ge76 0νββ decay

    Marie Pichotta1,*, Toralf Döring1,2, Hans F. R. Hoffmann1, Konrad Schmidt3, Ronald Schwengner3, Steffen Turkat1, Birgit Zatschler1,†, and Kai Zuber1

    • *Contact author: marie.pichotta@tu-dresden.de
    • †Present address: Laurentian University, Sudbury, Canada.

    Phys. Rev. C 112, 014325 – Published 23 July, 2025

    DOI: https://doi.org/10.1103/bczs-6hvl

    Abstract

    Neutrinoless double-beta decay of nuclei represents one of the most promising methods for uncovering physics beyond the standard model. In this context, Ge76 stands out as a particularly attractive candidate, as it can serve as an intrinsic component in semiconductor detectors. If the neutrinoless process occurs in Ge76, its signature would appear as a distinct peak at the Q value of 2039keV. A neutron activation measurement was performed on a germanium sample isotopically enriched in Ge76 at the DT neutron generator of TU Dresden. The measurement confirmed the presence of γ rays with energies of 2033.1±0.5keV, 2035.5±0.4keV, and 2040.22±0.26keV originating from the decays of Ga74 and Ga76. These γ rays lie in close proximity to the expected neutrinoless double-beta decay signal of Ge76.

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