Measurement of the Spectral Shape of the β-Decay of Xe 137 to the Ground State of Cs 137 in EXO-200 and Comparison with Theory

EXO-200 Collaboration

Research output: Contribution to journalArticle

Abstract

We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden nonunique β-decay transition Xe137(7/2-)→Cs137(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.

Original languageEnglish (US)
Article number232502
JournalPhysical review letters
Volume124
Issue number23
DOIs
StatePublished - Jun 12 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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