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Development of a 127Xe calibration source for nEXO

Journal Article · · Journal of Instrumentation
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  1. Stanford Univ., CA (United States); nEXO Collaboration. et al.
Here, 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.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Stanford Univ., CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
The nEXO Collaboration
Grant/Contract Number:
AC05-00OR22725; AC05-76RL01830; AC52-07NA27344; SC0012704; SC0017970
OSTI ID:
1898602
Alternate ID(s):
OSTI ID: 1902057
OSTI ID: 1903456
OSTI ID: 1922612
OSTI ID: 2202535
OSTI ID: 1984368
OSTI ID: 1992037
Report Number(s):
BNL--223681-2022-JAAM; BNL-223758-2022-JAAM; LLNL--JRNL-839806; PNNL-SA--178273; PNNL-SA-178273
Journal Information:
Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 07 Vol. 17; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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