Observation of two-neutrino double-beta decay in 136Xe with the EXO-200 detector

N Ackerman; B Aharmim; M Auger; D J Auty; P S Barbeau; K Barry; L Bartoszek; E Beauchamp; V Belov; C Benitez-Medina; M Breidenbach; A Burenkov; B Cleveland; R Conley; E Conti; J Cook; S Cook; A Coppens; I Counts; W Craddock; T Daniels; M V Danilov; C G Davis; J Davis; R deVoe; Z Djurcic; A Dobi; A G Dolgolenko; M J Dolinski; K Donato; M Dunford; W Fairbank Jr; J Farine; P Fierlinger; D Franco; D Freytag; G Giroux; R Gornea; K Graham; G Gratta; M P Green; C Hägemann; C Hall; K Hall; G Haller; C Hargrove; R Herbst; S Herrin; J Hodgson; M Hughes; A Johnson; A Karelin; L J Kaufman; T Koffas; A Kuchenkov; A Kumar; K S Kumar; D S Leonard; F Leonard; F LePort; D Mackay; R MacLellan; M Marino; Y Martin; B Mong; M Montero Díez; P Morgan; A R Müller; R Neilson; R Nelson; A Odian; K O'Sullivan; C Ouellet; A Piepke; A Pocar; C Y Prescott; K Pushkin; A Rivas; E Rollin; P C Rowson; J J Russell; A Sabourov; D Sinclair; K Skarpaas; S Slutsky; V Stekhanov; V Strickland; M Swift; D Tosi; K Twelker; P Vogel; J-L Vuilleumier; J-M Vuilleumier; A Waite; S Waldman; T Walton; K Wamba; M Weber; U Wichoski; J Wodin; J D Wright; L Yang; Y-R Yen; O Ya Zeldovich; EXO Collaboration

doi:10.1103/PhysRevLett.107.212501

Observation of two-neutrino double-beta decay in 136Xe with the EXO-200 detector

Phys Rev Lett. 2011 Nov 18;107(21):212501. doi: 10.1103/PhysRevLett.107.212501. Epub 2011 Nov 17.

Authors

N Ackerman¹, B Aharmim, M Auger, D J Auty, P S Barbeau, K Barry, L Bartoszek, E Beauchamp, V Belov, C Benitez-Medina, M Breidenbach, A Burenkov, B Cleveland, R Conley, E Conti, J Cook, S Cook, A Coppens, I Counts, W Craddock, T Daniels, M V Danilov, C G Davis, J Davis, R deVoe, Z Djurcic, A Dobi, A G Dolgolenko, M J Dolinski, K Donato, M Dunford, W Fairbank Jr, J Farine, P Fierlinger, D Franco, D Freytag, G Giroux, R Gornea, K Graham, G Gratta, M P Green, C Hägemann, C Hall, K Hall, G Haller, C Hargrove, R Herbst, S Herrin, J Hodgson, M Hughes, A Johnson, A Karelin, L J Kaufman, T Koffas, A Kuchenkov, A Kumar, K S Kumar, D S Leonard, F Leonard, F LePort, D Mackay, R MacLellan, M Marino, Y Martin, B Mong, M Montero Díez, P Morgan, A R Müller, R Neilson, R Nelson, A Odian, K O'Sullivan, C Ouellet, A Piepke, A Pocar, C Y Prescott, K Pushkin, A Rivas, E Rollin, P C Rowson, J J Russell, A Sabourov, D Sinclair, K Skarpaas, S Slutsky, V Stekhanov, V Strickland, M Swift, D Tosi, K Twelker, P Vogel, J-L Vuilleumier, J-M Vuilleumier, A Waite, S Waldman, T Walton, K Wamba, M Weber, U Wichoski, J Wodin, J D Wright, L Yang, Y-R Yen, O Ya Zeldovich; EXO Collaboration

Affiliation

¹ SLAC National Accelerator Laboratory, Stanford, California, USA.

PMID: 22181874
DOI: 10.1103/PhysRevLett.107.212501

Abstract

We report the observation of two-neutrino double-beta decay in (136)Xe with T(1/2) = 2.11 ± 0.04(stat) ± 0.21(syst) × 10(21) yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for (136)Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrinoless double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.