Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Fundamental Symmetries I
HK 64.5: Vortrag
Donnerstag, 31. März 2022, 15:15–15:30, HK-H9
Search for low Q-value beat decays for neutrino mass determination — •zhuang ge1,2, Tommi Eronen2, and IGISOL collaboration2 — 1GSI Helmholtzzen-trum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany — 2Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
The scale of neutrino masses is one of the burning open questions in physics. The β decay experiments search the electron neutrino mass by measuring the slight distortion and energy deficit of the end-point of the β spectrum. As small as possible decay energy (Q value), is essential to maximize decay events near the end-point. We map out nuclei that potentially undergo β decay with an ultra-low Q value (< 1 keV) to an excited state in the daughter nucleus. A precise and accurate determination of these ultra-low Q values requires the measurements of the groud-state-to-groud-state (gs-to-gs) Q values to ∼ 100-eV level. We have measured gs-to-gs decay Q values of several candidates with the JYFLTRAP Penning trap setup. The high-precision Q-value measurement from our experiment combined with the nuclear energy level data will be used to determine whether the possible low Q-value β-decay candidate for the neutrino mass are energetically allowed and, if positive, how small. In this report, the experimental techniques of TOF-ICR and PI-ICR methods to determine the gs-to-gs Q value to a relative precision of ∼ 10−9 for the application of neutrino mass determination will be discussed and the preliminary results of some prospective cases will be presented.