Aprile, E., Aelbers, J., Abe, K. et al. (46 more authors) (2026) Spectral measurement of the 214Bi β decay to the 214Po ground state with the XENONnT experiment. Physical Review C, 113 (4). 044303. ISSN: 2469-9985
Abstract
We report the measurement of the Bi214β-decay spectrum to the ground state of Po214 using the XENONnT detector. This decay is classified as first-forbidden nonunique, for which theoretical predictions require detailed nuclear structure modeling. A dedicated identification algorithm isolates a high-purity sample of ground-state β decays, explicitly excluding events with associated γ-ray emission. By comparing the measured spectrum, which covers energies up to 3.27MeV, with several nuclear models, we find that the prediction based on the conserved vector current 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 megaelectronvolt scale.
Metadata
| Item Type: | Article |
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| Authors/Creators: |
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| Copyright, Publisher and Additional Information: | © 2026 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Beta decay; Electroweak interactions in nuclear physics; 190 ≤ A ≤ 219; Spectrometers & spectroscopic techniques |
| Dates: |
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| Institution: | The University of Sheffield |
| Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematical and Physical Sciences |
| Date Deposited: | 16 Apr 2026 09:19 |
| Last Modified: | 16 Apr 2026 14:34 |
| Published Version: | https://doi.org/10.1103/b3r7-6ff4 |
| Status: | Published |
| Publisher: | American Physical Society (APS) |
| Refereed: | Yes |
| Identification Number: | 10.1103/b3r7-6ff4 |
| Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:240075 |
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