Development of a 127Xe calibration source for nEXO

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We study a possible calibration technique for the nEXO experiment using a 127Xe electron capture source. nEXO is a next-generation search for neutrinoless double beta decay (0νββ) that will use a 5-tonne, monolithic liquid xenon time projection chamber (TPC). The xenon, used both as source and detection medium, will be enriched to 90% in 136Xe. To optimize the event reconstruction and energy resolution, calibrations are needed to map the position- and time-dependent detector response. The 36.3 day half-life of 127Xe and its small Q-value compared to that of 136Xe 0νββ would allow a small activity to be maintained continuously in the detector during normal operations without introducing additional backgrounds, thereby enabling in-situ calibration and monitoring of the detector response. In this work we describe a process for producing the source and preliminary experimental tests. We then use simulations to project the precision with which such a source could calibrate spatial corrections to the light and charge response of the nEXO TPC.

Original languageEnglish
Article numberP07028
JournalJournal of Instrumentation
Issue number7
StatePublished - Jul 1 2022

Bibliographical note

Publisher Copyright:
© 2022 IOP Publishing Ltd and Sissa Medialab.


  • Cryogenic detectors
  • Double-beta decay detectors
  • Liquid detectors
  • Time projection chambers

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics


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