Tracking detectors achieve 1σ mechanism discrimination in neutrinoless double-beta decay with a few events and 3σ with roughly 10 events, rising to about 25 events under realistic reconstruction uncertainties.
Sensitivity of NEXT-100 to neutrinoless double beta decay
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abstract
NEXT-100 is an electroluminescent high-pressure xenon gas time projection chamber that will search for the neutrinoless double beta ($\beta \beta 0 \nu$) decay of Xe-136. The detector possesses two features of great value for $\beta \beta 0 \nu$ searches: energy resolution better than 1\% FWHM at the $Q$ value of Xe-136 and track reconstruction for the discrimination of signal and background events. This combination results in excellent sensitivity, as discussed in this paper. Material-screening measurements and a detailed Monte Carlo detector simulation predict a background rate for NEXT-100 of at most $4\times10^{-4}$ counts keV$^{-1}$ kg$^{-1}$ yr$^{-1}$. Accordingly, the detector will reach a sensitivity to the \bbonu-decay half-life of $2.8\times10^{25}$ years (90\% CL) for an exposure of 100 $\mathrm{kg}\cdot\mathrm{year}$, or $6.0\times10^{25}$ years after a run of 3 effective years.
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CUPID proposes a large bolometric detector array with alpha/beta discrimination to achieve a background-free search for 0νββ decay in 100Mo and probe the inverted neutrino mass hierarchy.
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Statistical sensitivity of neutrinoless double-beta decay exchange mechanism discrimination by tracking experiments
Tracking detectors achieve 1σ mechanism discrimination in neutrinoless double-beta decay with a few events and 3σ with roughly 10 events, rising to about 25 events under realistic reconstruction uncertainties.
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CUPID pre-CDR
CUPID proposes a large bolometric detector array with alpha/beta discrimination to achieve a background-free search for 0νββ decay in 100Mo and probe the inverted neutrino mass hierarchy.