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Sensitivity of the DARWIN observatory to the neutrinoless double beta decay of $^{136}$Xe

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

F. Agostini , S. E. M. Ahmed Maouloud , L. Althueser , F. Amaro , B. Antunovic , E. Aprile , L. Baudis , D. Baur
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Y. Biondi A. Bismark P. A. Breur A. Brown G. Bruno R. Budnik C. Capelli J. Cardoso D. Cichon M. Clark A. P. Colijn J. J. Cuenca-García J. P. Cussonneau M. P. Decowski A. Depoian J. Dierle P. Di Gangi A. Di Giovanni S. Diglio J. M. F. dos Santos G. Drexlin K. Eitel R. Engel A. D. Ferella H. Fischer M. Galloway F. Gao F. Girard F. Glück L. Grandi R. Grö{ss}le R. Gumbsheimer S. Hansmann-Menzemer F. Jörg G. Khundzakishvili A. Kopec F. Kuger L. M. Krauss H. Landsman R. F. Lang S. Lindemann M. Lindner J. A. M. Lopes A. Loya Villalpando C. Macolino A. Manfredini T. Marrodán Undagoitia J. Masbou E. Masson P. Meinhardt S. Milutinovic A. Molinario C. M. B. Monteiro M. Murra U. G. Oberlack M. Pandurovic R. Peres J. Pienaar M. Pierre V. Pizzella J. Qin D. Ramírez García S. Reichard N. Rupp P. Sanchez-Lucas G. Sartorelli D. Schulte M. Schumann L. Scotto Lavina M. Selvi M. Silva H. Simgen M. Steidl A. Terliuk C. Therreau D. Thers K. Thieme R. Trotta C. D. Tunnell K. Valerius G. Volta D. Vorkapic C. Weinheimer C. Wittweg J. Wolf J. P. Zopounidis K. Zuber (DARWIN Collaboration)
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classification physics.ins-dethep-exnucl-ex
keywords betadarwindecaydoublesensitivityxenonbackgroundnatural
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abstract

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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  1. Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment

    physics.ins-det 2019-08 accept novelty 7.0 of 10

    EXO-200 measured the absolute ionization and scintillation yields of liquid xenon at 1.1-2.6 MeV, finding a W-value of 11.5 eV and a recombination-independent energy scale about 15% below the NEST simulation prediction.

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