2025/10/06 by E. Aprile, Aprile, E., J. Aalbers +268 · 1 citation
Physics and Astronomy · #Charge (physics) #Detector #FOS: Physical sciences #Ground state #High Energy Physics - Experiment (hep-ex) #Identification (biology) #Nuclear Experiment (nucl-ex) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Spectral line #Spectrum (functional analysis) #State (computer science) #Yield (engineering)
paper · pdf · doi:10.48550/arxiv.2510.04846
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2025/10/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
We report the measurement of the 214Bi beta-decay spectrum to the ground state of 214Po using the XENONnT detector. This decay is classified as first-forbidden non-unique, for which theoretical predictions require detailed nuclear structure modeling. A dedicated identification algorithm isolates a high-purity sample of ground-state beta-decays, explicitly excluding events with associated gamma-rays emission. By comparing the measured spectrum, which covers energies up to 3.27 MeV, with several nuclear models, we find that the prediction based on the conserved vector current (CVC) hypothesis provides the best description of the data. Using this dataset, we additionally derive charge and light yield curves for electronic recoils, extending detector response modeling up to the MeV scale.