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Title: Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector

Journal Article · · Physical Review Letters

Results from a search for neutrinoless double-beta decay (0νββ) of 136Xe are presented using the first year of data taken with the upgraded EXO-200 detector. Relative to previous searches by EXO-200, the energy resolution of the detector has been improved to σ/E = 1.23 % , the electric field in the drift region has been raised by 50%, and a system to suppress radon in the volume between the cryostat and lead shielding has been implemented. In addition, analysis techniques that improve topological discrimination between 0νββ and background events have been developed. Incorporating these hardware and analysis improvements, the median 90% confidence level 0νββ half-life sensitivity after combining with the full data set acquired before the upgrade has increased twofold to 3.7 × 10 25 yr . Finally, no statistically significant evidence for 0νββ is observed, leading to a lower limit on the 0νββ half-life of 1.8 × 1025 yr at the 90% confidence level.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
EXO-200 Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1421313
Alternate ID(s):
OSTI ID: 1423521
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 120 Journal Issue: 7; ISSN 0031-9007
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 141 works
Citation information provided by
Web of Science

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Cited By (21)

Barium Chemosensors with Dry-Phase Fluorescence for Neutrinoless Double Beta Decay journal October 2019
The mass ratios parametrization journal January 2019
Seesaw Dirac neutrino mass through dimension-six operators journal August 2018
Neutrino-less double beta decay experiments journal November 2018
Required sensitivity in the search of neutrinoless double beta decay in 124Sn journal September 2019
From First Tritium Operation of the Karlsruhe Tritium Neutrino Experiment Toward Precise Determination of the Neutrino Mass journal December 2019
First search for 2 ε and εβ + decay of 162 Er and new limit on 2 β decay of 170 Er to the first excited level of 170 Yb journal July 2018
Partial cross section of neutron-induced reactions on 136 Xe at E n = 5 MeV for 0 νββ background studies journal November 2018
Nuclear matrix elements of neutrinoless double beta decay for masses 130 and 136 in the shell model journal January 2020
Double beta decay experiments: present and future journal November 2019
High-spin states of the N = 82 isotones Xe 136 ,   Cs 137 , and Ba 138 : Monopole-driven competition of neutron core excitations with two-proton excitations to the h 11 / 2 high- j orbit journal December 2019
Neutrinoless β β nuclear matrix elements using isovector spin-dipole J π = 2 data journal August 2018
Dirac neutrino mass generation from a Majorana messenger journal February 2020
Low scale type I seesaw model for lepton masses and mixings journal February 2020
Probing Majorana neutrinos with double-β decay journal September 2019
First results from the AMoRE-Pilot neutrinoless double beta decay experiment journal September 2019
The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects journal January 2020
Neutrinoless double beta decay overview journal January 2019
Status of Neutrino Properties and Future Prospects—Cosmological and Astrophysical Constraints journal February 2018
High Pressure Gas Xenon TPCs for Double Beta Decay Searches journal April 2019
Result on the Neutrinoless Double Beta Decay Search of 82Se with the CUPID-0 Experiment journal December 2018

Figures / Tables (5)


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