First Result on the Neutrinoless Double- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>β</mml:mi></mml:mrow></mml:math> Decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Se</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>82</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> with CUPID-0

O. Azzolini, María Teresa Ruiz Barrera, Jeffrey W. Beeman, F. Bellini, M. Beretta, M. Biassoni, C. Brofferio, C. Bucci, L. Canonica, S. Capelli

Abstract

We report the result of the search for neutrinoless double beta decay of 82Se obtained with CUPID-0, the first large array of scintillating Zn82Se cryogenic calorimeters implementing particle identification. We observe no signal in a 1.83 kg yr 82Se exposure, and we set the most stringent lower limit on the 0νββ 82Se half-life T0ν1/2>2.4×1024 yr (90% credible interval), which corresponds to an effective Majorana neutrino mass mββ<(376–770) meV depending on the nuclear matrix element calculations. The heat-light readout provides a powerful tool for the rejection of α particles and allows us to suppress the background in the region of interest down to (3.6+1.9−1.4)×10−3 counts/(keV kg yr), an unprecedented level for this technique.Received 21 February 2018Revised 16 April 2018DOI:https://doi.org/10.1103/PhysRevLett.120.232502© 2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasNeutrinoless double beta decayNuclear Physics

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