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Title:
Observation of Two-Neutrino Double-Beta Decay in Xe136 with the EXO-200 Detector
Authors:
Ackerman, N.; Aharmim, B.; Auger, M.; Auty, D. J.; Barbeau, P. S.; Barry, K.; Bartoszek, L.; Beauchamp, E.; Belov, V.; Benitez-Medina, C.; Breidenbach, M.; Burenkov, A.; Cleveland, B.; Conley, R.; Conti, E.; Cook, J.; Cook, S.; Coppens, A.; Counts, I.; Craddock, W.; Daniels, T.; Danilov, M. V.; Davis, C. G.; Davis, J.; Devoe, R.; Djurcic, Z.; Dobi, A.; Dolgolenko, A. G.; Dolinski, M. J.; Donato, K.; Dunford, M.; Fairbank, W., Jr.; Farine, J.; Fierlinger, P.; Franco, D.; Freytag, D.; Giroux, G.; Gornea, R.; Graham, K.; Gratta, G.; Green, M. P.; Hägemann, C.; Hall, C.; Hall, K.; Haller, G.; Hargrove, C.; Herbst, R.; Herrin, S.; Hodgson, J.; Hughes, M.; Johnson, A.; Karelin, A.; Kaufman, L. J.; Koffas, T.; Kuchenkov, A.; Kumar, A.; Kumar, K. S.; Leonard, D. S.; Leonard, F.; Leport, F.; Mackay, D.; MacLellan, R.; Marino, M.; Martin, Y.; Mong, B.; Montero Díez, M.; Morgan, P.; Müller, A. R.; Neilson, R.; Nelson, R.; Odian, A.; O'Sullivan, K.; Ouellet, C.; Piepke, A.; Pocar, A.; Prescott, C. Y.; Pushkin, K.; Rivas, A.; Rollin, E.; Rowson, P. C.; Russell, J. J.; Sabourov, A.; Sinclair, D.; Skarpaas, K.; Slutsky, S.; Stekhanov, V.; Strickland, V.; Swift, M.; Tosi, D.; Twelker, K.; Vogel, P.; Vuilleumier, J.-L.; Vuilleumier, J.-M.; Waite, A.; Waldman, S.; Walton, T.; Wamba, K.; Weber, M.; Wichoski, U.; Wodin, J.; Wright, J. D.; Yang, L.; Yen, Y.-R.; Zeldovich, O. Ya.
Affiliation:
AA(SLAC National Accelerator Laboratory, Stanford, California, USA), AB(Physics Department, Laurentian University, Sudbury, Ontario, Canada), AC(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), AD(Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, USA), AE(Physics Department, Stanford University, Stanford, California, USA), AF(Physics Department, Stanford University, Stanford, California, USA), AG(Physics Department, Stanford University, Stanford, California, USA), AH(Physics Department, Laurentian University, Sudbury, Ontario, Canada), AI(Institute for Theoretical and Experimental Physics, Moscow, Russia), AJ(Physics Department, Colorado State University, Fort Collins, Colorado, USA), AK(SLAC National Accelerator Laboratory, Stanford, California, USA), AL(Institute for Theoretical and Experimental Physics, Moscow, Russia), AM(Physics Department, Laurentian University, Sudbury, Ontario, Canada), AN(SLAC National Accelerator Laboratory, Stanford, California, USA), AO(SLAC National Accelerator Laboratory, Stanford, California, USA), AP(Physics Department, University of Massachusetts, Amherst, Massachusetts, USA), AQ(Physics Department, Colorado State University, Fort Collins, Colorado, USA), AR(Physics Department, Carleton University, Ottawa, Ontario, Canada), AS(Physics Department, Stanford University, Stanford, California, USA), AT(SLAC National Accelerator Laboratory, Stanford, California, USA), AU(Physics Department, University of Massachusetts, Amherst, Massachusetts, USA), AV(Institute for Theoretical and Experimental Physics, Moscow, Russia), AW(Physics Department, University of Maryland, College Park, Maryland, USA), AX(Physics Department, Stanford University, Stanford, California, USA), AY(Physics Department, Stanford University, Stanford, California, USA), AZ(Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, USA), BA(Physics Department, University of Maryland, College Park, Maryland, USA), BB(Institute for Theoretical and Experimental Physics, Moscow, Russia), BC(Physics Department, Stanford University, Stanford, California, USA), BD(Physics Department, Laurentian University, Sudbury, Ontario, Canada), BE(Physics Department, Carleton University, Ottawa, Ontario, Canada), BF(Physics Department, Colorado State University, Fort Collins, Colorado, USA), BG(Physics Department, Laurentian University, Sudbury, Ontario, Canada), BH(Technical University Munich, Munich, Germany), BI(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), BJ(SLAC National Accelerator Laboratory, Stanford, California, USA), BK(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), BL(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), BM(Physics Department, Carleton University, Ottawa, Ontario, Canada), BN(Physics Department, Stanford University, Stanford, California, USA), BO(Physics Department, Stanford University, Stanford, California, USA), BP(Physics Department, Carleton University, Ottawa, Ontario, Canada), BQ(Physics Department, University of Maryland, College Park, Maryland, USA), BR(Physics Department, Colorado State University, Fort Collins, Colorado, USA), BS(SLAC National Accelerator Laboratory, Stanford, California, USA), BT(Physics Department, Carleton University, Ottawa, Ontario, Canada), BU(SLAC National Accelerator Laboratory, Stanford, California, USA), BV(SLAC National Accelerator Laboratory, Stanford, California, USA), BW(SLAC National Accelerator Laboratory, Stanford, California, USA), BX(Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, USA), BY(SLAC National Accelerator Laboratory, Stanford, California, USA), BZ(Institute for Theoretical and Experimental Physics, Moscow, Russia), CA(Physics Department and CEEM, Indiana University, Bloomington, Indiana, USA), CB(Physics Department, Stanford University, Stanford, California, USA), CC(Institute for Theoretical and Experimental Physics, Moscow, Russia), CD(Physics Department, Stanford University, Stanford, California, USA), CE(Physics Department, University of Massachusetts, Amherst, Massachusetts, USA), CF(Department of Physics, University of Seoul, Seoul, Korea), CG(Physics Department, Carleton University, Ottawa, Ontario, Canada), CH(Physics Department, Stanford University, Stanford, California, USA), CI(SLAC National Accelerator Laboratory, Stanford, California, USA), CJ(Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, USA), CK(Technical University Munich, Munich, Germany), CL(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), CM(Physics Department, Colorado State University, Fort Collins, Colorado, USA), CN(Physics Department, Stanford University, Stanford, California, USA), CO(Physics Department, University of Massachusetts, Amherst, Massachusetts, USA), CP(Physics Department, Stanford University, Stanford, California, USA), CQ(Physics Department, Stanford University, Stanford, California, USA), CR(Waste Isolation Pilot Plant, Carlsbad, New Mexico, USA), CS(SLAC National Accelerator Laboratory, Stanford, California, USA), CT(Physics Department, Stanford University, Stanford, California, USA), CU(Physics Department, Carleton University, Ottawa, Ontario, Canada), CV(Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, USA), CW(Physics Department, University of Massachusetts, Amherst, Massachusetts, USA), CX(SLAC National Accelerator Laboratory, Stanford, California, USA), CY(Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama, USA), CZ(Physics Department, Stanford University, Stanford, California, USA), DA(Physics Department, Carleton University, Ottawa, Ontario, Canada), DB(SLAC National Accelerator Laboratory, Stanford, California, USA), DC(SLAC National Accelerator Laboratory, Stanford, California, USA), DD(Physics Department, Stanford University, Stanford, California, USA), DE(Physics Department, Carleton University, Ottawa, Ontario, Canada), DF(SLAC National Accelerator Laboratory, Stanford, California, USA), DG(Physics Department, University of Maryland, College Park, Maryland, USA), DH(Institute for Theoretical and Experimental Physics, Moscow, Russia), DI(Physics Department, Carleton University, Ottawa, Ontario, Canada), DJ(SLAC National Accelerator Laboratory, Stanford, California, USA), DK(Physics Department, Stanford University, Stanford, California, USA), DL(Physics Department, Stanford University, Stanford, California, USA), DM(Kellogg Lab, Caltech, Pasadena, California, USA), DN(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), DO(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), DP(SLAC National Accelerator Laboratory, Stanford, California, USA), DQ(Physics Department, Stanford University, Stanford, California, USA), DR(Physics Department, Colorado State University, Fort Collins, Colorado, USA), DS(SLAC National Accelerator Laboratory, Stanford, California, USA), DT(LHEP, Albert Einstein Center, University of Bern, Bern, Switzerland), DU(Physics Department, Laurentian University, Sudbury, Ontario, Canada), DV(SLAC National Accelerator Laboratory, Stanford, California, USA), DW(Physics Department, University of Massachusetts, Amherst, Massachusetts, USA), DX(SLAC National Accelerator Laboratory, Stanford, California, USA), DY(Physics Department, University of Maryland, College Park, Maryland, USA), DZ(Institute for Theoretical and Experimental Physics, Moscow, Russia)
Publication:
Physical Review Letters, vol. 107, Issue 21, id. 212501 (PhRvL Homepage)
Publication Date:
11/2011
Origin:
APS
PACS Keywords:
Beta decay, double beta decay, electron and muon capture, Neutrino mass and mixing
DOI:
10.1103/PhysRevLett.107.212501
Bibliographic Code:
2011PhRvL.107u2501A

Abstract

We report the observation of two-neutrino double-beta decay in Xe136 with T1/2=2.11±0.04(stat)±0.21(syst)×1021yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for Xe136. 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.
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