File:PhysRevLett.122.192501.pdf
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[edit]DescriptionPhysRevLett.122.192501.pdf |
English: We present a precision analysis of the 136Xe two-neutrino ββ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino ββ rate allows us to measure the ratio of the leading and subleading 2νββ nuclear matrix elements (NMEs), ξ2ν31=−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 ξ2ν31 range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ξ2ν31 values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Because these aspects are also at play in neutrinoless ββ decay, ξ2ν31 provides new insights toward reliable neutrinoless ββ NMEs. |
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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.192501 https://doi.org/10.1103/PhysRevLett.122.192501 |
Author | A. Gando et al. (KamLAND-Zen Collaboration) |
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Short title | Precision Analysis of the Xe136 Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements |
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Image title | doi:10.1103/PhysRevLett.122.192501 url:https://doi.org/10.1103/PhysRevLett.122.192501 |
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Software used | Published by the American Physical Society |
Conversion program | Acrobat Distiller 10.1.16 (Windows) |
Encrypted | no |
Page size | 612 x 792 pts (letter) |
Version of PDF format | 1.4 |
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