A new approach to two-neutrino double beta decay rates incorporates full nuclear-lepton interdependence and shows deviations from closure, non-closure, and Taylor approximations for 82Se and 136Xe.
Precise $^{136}$Xe Double Beta Decay Measurement in PandaX-4T with Implications on the Nuclear Matrix Elements and Majorons
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abstract
The continuous spectrum of double beta decay ($\beta\beta$) provides a sensitive probe to test the predictions of the standard model and to search for signatures of new physics beyond it. We present a comprehensive analysis of the $^{136}$Xe $\beta\beta$ spectrum utilizing $39.1 \pm 0.7~\textrm{kg}\cdot\textrm{yr}$ of $^{136}$Xe exposure from the PandaX-4T experiment. The analysis yields the most precise measurement to date of the $^{136}$Xe two-neutrino double beta decay ($2\nu\beta\beta$) half-life, $(2.14 \pm 0.05) \times 10^{21}$ years, the uncertainty of which is reduced by a factor of 2 compared to our previous result. We measure the parameter $\xi_{31}^{2\nu}$, defined as the ratio between the subleading and leading components of the $^{136}$Xe $2\nu\beta\beta$ nuclear matrix element, to be $0.59^{+0.41}_{-0.38}$, which is consistent with theoretical predictions. We also search for Majoron-emitting modes of $^{136}$Xe $\beta\beta$, establishing the most stringent limit for the spectral index $n=7$.
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UNVERDICTED 4representative citing papers
Ab initio IM-NCCI calculations on 48Ca establish linear correlations between 0νββ and 2νββ NMEs from 34 chiral Hamiltonians, constraining M^{0ν} to 1.30-1.65 using experimental 2ν data after applying a fitted quenching factor.
PandaX-4T Run 2 data yields solar pp neutrino flux of (8.5 ± 3.5)×10^{10} cm^{-2}s^{-1} at 2.2σ, first positive indication below 165 keV electronic recoil.
A review of theoretical foundations, experimental strategies, achieved sensitivities, and required advances to detect neutrinoless double beta decay.
citing papers explorer
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Exact Calculation of Two-neutrino Double Beta Decay Rate
A new approach to two-neutrino double beta decay rates incorporates full nuclear-lepton interdependence and shows deviations from closure, non-closure, and Taylor approximations for 82Se and 136Xe.
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Ab initio correlations between neutrinoless and two-neutrino double-beta decays in $^{48}$Ca
Ab initio IM-NCCI calculations on 48Ca establish linear correlations between 0νββ and 2νββ NMEs from 34 chiral Hamiltonians, constraining M^{0ν} to 1.30-1.65 using experimental 2ν data after applying a fitted quenching factor.
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Measurement of solar $pp$ neutrino flux with the new PandaX-4T data
PandaX-4T Run 2 data yields solar pp neutrino flux of (8.5 ± 3.5)×10^{10} cm^{-2}s^{-1} at 2.2σ, first positive indication below 165 keV electronic recoil.
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The Quest for Neutrinoless Double Beta Decay: Progress and Prospects
A review of theoretical foundations, experimental strategies, achieved sensitivities, and required advances to detect neutrinoless double beta decay.