A1 Journal article (refereed)
Measurement of the Spectral Shape of the β-Decay of 137Xe to the Ground State of 137Cs in EXO-200 and Comparison with Theory (2020)
EXO-200 Collaboration. (2020). Measurement of the Spectral Shape of the β-Decay of 137Xe to the Ground State of 137Cs in EXO-200 and Comparison with Theory. Physical Review Letters, 124(23), Article 232502. https://doi.org/10.1103/PhysRevLett.124.232502
JYU authors or editors
Publication details
All authors or editors: EXO-200 Collaboration
Journal or series: Physical Review Letters
ISSN: 0031-9007
eISSN: 1079-7114
Publication year: 2020
Volume: 124
Issue number: 23
Article number: 232502
Publisher: American Physical Society
Publication country: United States
Publication language: English
DOI: https://doi.org/10.1103/PhysRevLett.124.232502
Publication open access: Not open
Publication channel open access:
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/71083
Publication is parallel published: https://arxiv.org/abs/2002.00108
Abstract
We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden nonunique β-decay transition 137Xe(7/2−)→137Cs(7/2+). The experimental data were acquired by the EXO-200 experiment during a deployment of an AmBe neutron source. The ultralow background environment of EXO-200, together with dedicated source deployment and analysis procedures, allowed for collection of a pure sample of the decays, with an estimated signal to background ratio of more than 99 to 1 in the energy range from 1075 to 4175 keV. In addition to providing a rare and accurate measurement of the first-forbidden nonunique β-decay shape, this work constitutes a novel test of the calculated electron spectral shapes in the context of the reactor antineutrino anomaly and spectral bump.
Keywords: nuclear physics; particle physics
Contributing organizations
Related projects
- Nuclear Theory for Fundamental Physics
- Suhonen, Jouni
- Research Council of Finland
Ministry reporting: Yes
VIRTA submission year: 2020
JUFO rating: 3