Neutrinoless double-beta decay of Ge-76: First results from the International Germanium Experiment (IGEX) with six isotopically enriched detectors

Collaboration
1999
6 pages
Published in:
  • Phys.Rev.C 59 (1999) 2108-2113

Citations per year

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Abstract: (APS)
The International Germanium Experiment (IGEX) has six HPGe detectors, isotopically enriched to 86% in 76Ge, containing approximately 90 active moles of 76Ge. Three detectors of 2 kg each operate in the Canfranc Underground Laboratory (Spain) with pulse-shape analysis electronics. One detector (∼0.7 kg active volume) has been operating in the Baksan Low-Background Laboratory for several years, and two additional similar detectors will operate in Baksan. A maximum likelihood analysis of 74.84 active mole years of data yields a lower bound T1/20ν>~0.8×1025yr (90% C.L.), corresponding to 〈mν〉<(0.5–1.5)eV, depending on the theoretical nuclear matrix elements used to extract the neutrino mass parameter.
  • double-beta decay: (0neutrino)
  • germanium: lifetime
  • lower limit
  • neutrino: Majorana
  • neutrino: mass
  • statistical analysis
  • Baksan
  • experimental results