학술논문
Search for Neutrinoless Double-Beta Decay in $^{136}$Xe with EXO-200
Document Type
Working Paper
Author
Auger, M.; Auty, D. J.; Barbeau, P. S.; Beauchamp, E.; Belov, V.; Benitez-Medina, C.; Breidenbach, M.; Brunner, T.; Burenkov, A.; Cleveland, B.; Cook, S.; Daniels, T.; Danilov, M.; Davis, C. G.; Delaquis, S.; deVoe, R.; Dobi, A.; Dolinski, M. J.; Dolgolenko, A.; Dunford, M.; Fairbank Jr., W.; Farine, J.; Feldmeier, W.; Fierlinger, P.; Franco, D.; Giroux, G.; Gornea, R.; Graham, K.; Gratta, G.; Hall, C.; Hall, K.; Hargrove, C.; Herrin, S.; Hughes, M.; Johnson, A.; Johnson, T. N.; Karelin, A.; Kaufman, L. J.; Kuchenkov, A.; Kumar, K. S.; Leonard, D. S.; Leonard, F.; Mackay, D.; MacLellan, R.; Marino, M.; Mong, B.; Diez, M. Montero; Muller, A. R.; Neilson, R.; Nelson, R.; Odian, A.; Ostrovskiy, I.; O'Sullivan, K.; Ouellet, C.; Piepke, A.; Pocar, A.; Prescott, C. Y.; Pushkin, K.; Rowson, P. C.; Russell, J. J.; Sabourov, A.; Sinclair, D.; Slutsky, S.; Stekhanov, V.; Tolba, T.; Tosi, D.; Twelker, K.; Vogel, P.; Vuilleumier, J. -L.; Waite, A.; Walton, T.; Weber, M.; Wichoski, U.; Wodin, J.; Wright, J. D.; Yang, L.; Yen, Y. -R.; Zeldovich, O. Ya.
Source
Phys. Rev. Lett. 109, 032505 (2012)
Subject
Language
Abstract
We report on a search for neutrinoless double-beta decay of $^{136}$Xe with EXO-200. No signal is observed for an exposure of 32.5 kg-yr, with a background of ~1.5 x 10^{-3} /(kg yr keV) in the $\pm 1\sigma$ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay $T_{1/2}^{0\nu\beta\beta}$($^{136}$Xe) > 1.6 x 10$^{25}$ yr (90% CL), corresponding to effective Majorana masses of less than 140-380 meV, depending on the matrix element calculation.