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Highlights from GERDA: Probing the Majorana Neutrino Mass at 100 meV

Piazza della Scienza, 3-20154 Milano, Italy
Author to whom correspondence should be addressed.
INFN Milano Bicocca.
This paper is based on the talk at the 7th International Conference on New Frontiers in Physics (ICNFP 2018), Crete, Greece, 4–12 July 2018.
Universe 2019, 5(2), 55;
Received: 19 December 2018 / Revised: 29 January 2019 / Accepted: 31 January 2019 / Published: 7 February 2019
Since 2010, the Gerda experiment at Laboratori Nazionali del Gran Sasso (LNGS) operates searching for neutrinoless double beta decay ( 0 ν β β ) of 76 Ge to the ground and excited states of 76 Se. 0 ν β β is an ultra-rare process whose detection would directly establish the Majorana nature of the neutrino and provide a direct measurement of its mass. Since the apparatus upgrade in 2013–2015, the collaboration released the third update of the achieved results at the Neutrino 2018 Conference. The hardware upgrade and the fine tuning of the powerful analysis tools to reconstruct the event energy and to discriminate the background allowed the achievement of the energy resolution of 3 keV and 3.6 keV for Broad Energy Germanium (BEGe) and Coaxial Germanium (Coax) detectors, respectively, and an unprecedented low background index of 0.6 · 10 - 3 cts/(keV·kg·yr) 10 - 3 cts/(keV·kg·yr) in a 230 keV netto range centered at Q β β in the exposure of 58.93 kg·yr. No evidence of the 0 ν β β decay is found at the Q β β = 2039.1 keV, and the limit of 0.9 · 10 26 yr on the half-life ( T 1 / 2 0 ν ) at 90% C.L. is set. This corresponds to the limit range for the effective Majorana neutrino mass m e e of 110–260 meV. The Gerda sensitivity in terms of background index, energy resolution and exposure is the best achieved so far in 76 Ge double beta decay experiments, the energy resolution and background in the Region Of Interest (ROI) allow Gerda to operate in a background-free regime and to set a world record. View Full-Text
Keywords: neutrino; majorana; GERDA; Double Beta Decay; germanium neutrino; majorana; GERDA; Double Beta Decay; germanium
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Cattadori, C.M.; the GERDA Collaboration. Highlights from GERDA: Probing the Majorana Neutrino Mass at 100 meV. Universe 2019, 5, 55.

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