Header

UZH-Logo

Maintenance Infos

Probing Majorana neutrinos with double-β decay


Abstract

A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-β (0νββ) decay, a matter-creating process without the balancing emission of antimatter. The GERDA Collaboration searches for the 0νββ decay of <jats:sup>76</jats:sup>Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg⋅year, we observe no signal and derive a lower half-life limit of <jats:italic>T</jats:italic><jats:sub>1/2</jats:sub> &gt; 0.9 × 10<jats:sup>26</jats:sup> years (90% C.L.). Our <jats:italic>T</jats:italic><jats:sub>1/2</jats:sub> sensitivity, assuming no signal, is 1.1 × 10<jats:sup>26</jats:sup> years. Combining the latter with those from other 0νββ decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 to 0.16 electron volts.

Abstract

A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-β (0νββ) decay, a matter-creating process without the balancing emission of antimatter. The GERDA Collaboration searches for the 0νββ decay of <jats:sup>76</jats:sup>Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg⋅year, we observe no signal and derive a lower half-life limit of <jats:italic>T</jats:italic><jats:sub>1/2</jats:sub> &gt; 0.9 × 10<jats:sup>26</jats:sup> years (90% C.L.). Our <jats:italic>T</jats:italic><jats:sub>1/2</jats:sub> sensitivity, assuming no signal, is 1.1 × 10<jats:sup>26</jats:sup> years. Combining the latter with those from other 0νββ decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 to 0.16 electron volts.

Statistics

Citations

Dimensions.ai Metrics

Altmetrics

Downloads

1 download since deposited on 08 Jan 2020
1 download since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Multidisciplinary
Language:English
Date:27 September 2019
Deposited On:08 Jan 2020 16:12
Last Modified:11 Feb 2020 08:59
Publisher:American Association for the Advancement of Science
ISSN:0036-8075
OA Status:Closed
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1126/science.aav8613
Project Information:
  • : FunderH2020
  • : Grant ID674896
  • : Project TitleELUSIVES - The Elusives Enterprise: Asymmetries of the Invisible Universe
  • : FunderH2020
  • : Grant ID690575
  • : Project TitleInvisiblesPlus - InvisiblesPlus
  • : FunderH2020
  • : Grant ID674896
  • : Project TitleELUSIVES - The Elusives Enterprise: Asymmetries of the Invisible Universe

Download

Closed Access: Download allowed only for UZH members