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Title: Precision Analysis of the Xe 136 Two-Neutrino β β Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements

Journal Article · · Physical Review Letters

In this paper, we present a precision measurement of the $$^{136}$$Xe two-neutrino $$\beta\beta$$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino $$\beta\beta$$ rate allows us to measure the ratio of the leading and subleading $$2\nu\beta\beta$$ nuclear matrix elements (NMEs), $$\xi^{2\nu}_{31} = -0.26^{+0.31}_{-0.25}$$. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the $$\xi^{2\nu}_{31}$$ range allowed by the QRPA is excluded by the present measurement at the 90%25 C.L. Our analysis reveals that predicted $$\xi^{2\nu}_{31}$$ values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Since these aspects are also at play in neutrinoless $$\beta\beta$$ decay, $$\xi^{2\nu}_{31}$$ provides new insights towards reliable neutrinoless $$\beta\beta$$ NMEs.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
KamLAND-Zen Collaboration
Grant/Contract Number:
AC02-05CH11231; FG02-00ER41132
OSTI ID:
1512334
Alternate ID(s):
OSTI ID: 1506403
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 122 Journal Issue: 19; ISSN 0031-9007
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (2)

Isoscalar pairing interaction for the quasiparticle random-phase approximation approach to double- β and β decays journal September 2019
Evidence of Single State Dominance in the Two-Neutrino Double- β Decay of Se 82 with CUPID-0 journal December 2019

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