Phys. Rev. C 59, 2108–2113 (1999)Neutrinoless double-β decay of76Ge: First results from the International Germanium Experiment (IGEX) with six isotopically enriched detectorsReceived 25 June 1998; published in the issue dated April 1999 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. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.59.2108
DOI:
10.1103/PhysRevC.59.2108
PACS:
23.40.-s, 14.60.Pq, 27.50.+e
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