Current IGEX results for neutrinoless double-beta decay of Ge-76

Authors
Gonzalez, D Aalseth, CE Avignone, FT Brodzinski, RL Cebrian, S Garcia, E Hensley, WK Irastorza, IG Kirpichnikov, IV Klimenko, AA Miley, HS Morales, A Morales, J de Solozano, AO Osetrov, SB Pogosov, VS Puimedon, J Reeves, JH Sarsa, ML Scopel, S Smolnikov, AA Tamanyan, AG Vasenko, AA Vasiliev, SI Villar, JA
Citation
D. Gonzalez et al., Current IGEX results for neutrinoless double-beta decay of Ge-76, NUCL PH B-P, 87, 2000, pp. 278-280
Citations number
14
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
ISSN journal
09205632 → ACNP
Volume
87
Year of publication
2000
Pages
278 - 280
Database
ISI
SICI code
0920-5632(200006)87:<278:CIRFND>2.0.ZU;2-5
Abstract
The International Germanium Experiment (IGEX) is currently operating three 2-kg enriched germanium detectors in the Canfranc Underground Laboratory (S pain) at 2450 mwe, in a search for the neutrinoless double- beta decay of G e-76. The detectors are equipped with Pulse Shape Analysis electronics. Thi s implementation of Pulse Shape Discrimination results in a rejection of 60 %-80% of the background in the 2.0-2.5 MeV energy interval. Analysis of 116 .75 mole-years of data yields a lower bound greater than or equal to 1.57 x 10(25)y (or T-1/2(0 nu) greater than or equal to 1.13 x 10(25)y without PS D) (90% C.L.) corresponding to (m(nu)) < (0.33 - 1.31) eV, depending on the theoretical nuclear matrix elements used to extract the neutrino mass para meter.