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.
Search for Zero-Neutrino Double Beta Decay in 76Ge with the Majorana Demonstrator
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abstract
The \MJ\ Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The \MJ\ \DEM\ comprises 44.1~kg of Ge detectors (29.7 kg enriched in $^{76}$Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at \qval\ and a very low background with no observed candidate events in 10 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of $1.9\times10^{25}$ yr (90\% CL). This result constrains the effective Majorana neutrino mass to below 240 to 520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is $4.0_{-2.5}^{+3.1}$ counts/(FWHM t yr).
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Neutrino masses are unlikely to share the Standard Model origin of other fermion masses, with the Weinberg effective Lagrangian providing the simplest beyond-Standard-Model mechanism for small Majorana masses.
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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.
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Neutrino Masses from the Point of View of Economy and Simplicity
Neutrino masses are unlikely to share the Standard Model origin of other fermion masses, with the Weinberg effective Lagrangian providing the simplest beyond-Standard-Model mechanism for small Majorana masses.