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Sensitivity of the DARWIN observatory to the neutrinoless double beta decay of ¹³⁶Xe

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arxiv 2003.13407 v2 pith:4Z753CWH submitted 2020-03-25 physics.ins-det hep-exnucl-ex

Sensitivity of the DARWIN observatory to the neutrinoless double beta decay of ¹³⁶Xe

classification physics.ins-det hep-exnucl-ex
keywords betadarwindecaydoublesensitivityxenonbackgroundnatural
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The DARWIN observatory is a proposed next-generation experiment to search for particle dark matter and for the neutrinoless double beta decay of $^{136}$Xe. Out of its 50$\,$t total natural xenon inventory, 40$\,$t will be the active target of a time projection chamber which thus contains about 3.6 t of $^{136}$Xe. Here, we show that its projected half-life sensitivity is $2.4\times10^{27}\,$yr, using a fiducial volume of 5t of natural xenon and 10$\,$yr of operation with a background rate of less than 0.2$~$events/(t$\cdot$yr) in the energy region of interest. This sensitivity is based on a detailed Monte Carlo simulation study of the background and event topologies in the large, homogeneous target. DARWIN will be comparable in its science reach to dedicated double beta decay experiments using xenon enriched in $^{136}$Xe.

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