Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Structure and Dynamics of Nuclei XI
HK 48.1: Vortrag
Donnerstag, 13. März 2025, 15:45–16:00, HS 2 Physik
Constraining Double Beta Decay: Detailed Spectroscopy of 136Ba — •Jelena Bardak1,2, Giacomo Colombi3, Corinna Henrich4, Ilja Homm4, Nikola Jovancevic2, Ulli Koester5, Thorsten Kroell4, Caterina Michelagnoli5, Erin Peters6, Matthias Rudigier4, Marcus Scheck7, Kathrin Wimmer1, and S. W. Yates8 — 1GSI Helmholtzzentrum für Schwerionenforschung — 2Department of Physics, University of Novi Sad — 3University of Guelph — 4IKP TU Darmstadt — 5Institut Laue-Langevin, Grenoble — 6Department of Chemistry, University of Kentucky — 7School of Engineering, UWS, Paisley — 8Department of Physics and Astronomy, Lexington
Neutrinoless double beta decay (0νββ) is a rare process predicted by theories beyond the Standard Model, offering insights into neutrinos as Majorana particles with non-zero mass. The decay of 136Xe to 136Ba is a key candidate for 0νββ studies. Nuclear matrix elements (NMEs) are crucial for extracting neutrino properties from decay rates, but their values vary between theoretical models.This study investigates the nuclear structure of 136Ba through spectroscopy with the FIPPS detector at ILL. Coincidence analysis will refine the level scheme, and gamma-ray angular correlations will assign spins, parities, and mixing ratios. Lifetimes will be measured to reduce uncertainties and provide new data. The vibrational and mixed-symmetry properties of 136Ba will also be explored, enhancing understanding of its collective dynamics. These results aim to reduce NME uncertainties, advance knowledge of 0νββ, and contribute to broader nuclear structure studies.
Keywords: (n,gamma) reaction; FIPPS; gamma-gamma coincidences; angular correlations; NME