First Results from the \sc{Majorana Demonstrator}

COFFEE_KLATCH · Invited

Abstract

The {\sc Majorana Demonstrator} experiment has been operating since October 2016 inside a clean room 4850 feet underground in the Sanford Underground Research Facility in Lead, SD. The {\scDemonstrator} is searching for neutrinoless double beta (0$\nu\beta\beta$) decay in $^{76}$Ge using 29.7 kg of detectors made from germanium enriched to 88\% in that isotope. If observed, 0$\nu\beta\beta$ decay will prove that the neutrino and the anti-neutrino are identical and that lepton number is not a conserved quantity. It will also provide hints as to how the Big Bang produced more matter than it did antimatter. The primary goal of the {\sc Majorana Demonstrator} is to show that backgrounds can be reduced to a value low enough to justify a large 0$\nu\beta\beta$ experiment using $^{76}$Ge. More than six months of data from the {\sc Demonstrator} have been analyzed, and initial results for the background index will be presented, together with an outlook for the future sensitivity reach of the experiment. Future prospects for LEGEND, a new collaboration formed with the goal of fielding a tonne-scale $^{76}$Ge 0$\nu\beta\beta$ experiment, will also be discussed.

Authors

  • David C. Radford

    Oak Ridge National Laboratory