Abstract
The MAJORANA Collaboration has completed construction and is now operating an array of high purity Ge detectors searching for neutrinoless double-beta decay ([Formula: see text]) in [Formula: see text]Ge. The array, known as the MAJORANA DEMONSTRATOR, is comprised of 44 kg of Ge detectors (30 kg enriched to 88% in [Formula: see text]Ge) installed in an ultra-low background compact shield at the Sanford Underground Research Facility in Lead, South Dakota. The primary goal of the DEMONSTRATOR is to establish a low-background design that can be scaled to a next-generation tonne-scale experiment. This work reports initial background levels in the [Formula: see text] region of interest. Also presented are recent physics results leveraging P-type point-contact detectors with sub-keV energy thresholds to search for physics beyond the Standard Model; first results from searches for bosonic dark matter, solar axions, Pauli exclusion principle violation, and electron decay have been published. Finally, this work discusses the proposed tonne-scale [Formula: see text]Ge [Formula: see text] LEGEND experiment.
Highlights
Experimental searches for neutrinoless double-beta decay (0νββ) are motivated by several questions regarding the nature of neutrinos and their role in the evolution of the universe
The MAJORANA DEMONSTRATOR monitors a mass of 76Ge in the form of high purity Ge (HPGe) detectors
Alphas incident on the passivated surface of a detector can ionize charges that slowly drift along that surface and are delayed in their arrival at the electrode. This delayed charge recovery (DCR) counteracts the expected RC decay of a pulse, an effect that is captured by a DCR parameter whose value is used to identify and remove the alpha events[7,8]
Summary
T Gilliss[1,2], S I Alvis[3], I J Arnquist[4], F T Avignone III5,6, A S Barabash[7], C J Barton[8], F E Bertrand[6], T Bode[9], V Brudanin[10], M Busch[2,11], M Buuck[3], T S Caldwell[1,2], Y-D Chan[12], C D Christofferson[13], P -H Chu[14], C Cuestaa,[3], J A Detwiler[3], C Dunagan[13], Yu Efremenko[6,15], H Ejiri[16], S R Elliott[14], G K Giovanetti[17], M P Green[2,6,18], J Gruszko[19],. Moscow, Russia 8Department of Physics, University of South Dakota, Vermillion, SD, USA. The MAJORANA Collaboration has completed construction and is operating an array of high purity Ge detectors searching for neutrinoless double-beta decay (0νββ) in 76Ge. The array, known as the MAJORANA DEMONSTRATOR, is comprised of 44 kg of Ge detectors (30 kg enriched to 88% in 76Ge) installed in an ultra-low background compact shield at the Sanford Underground Research Facility in Lead, South Dakota. The primary goal of the DEMONSTRATOR is to establish a low-background design that can be scaled to a next-generation tonne-scale experiment. This work reports initial background levels in the 0νββ region of interest. This work discusses the proposed tonne-scale 76Ge 0νββ LEGEND experiment
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