/ nucl-ex arXiv:1501.02345


Results on $\beta\beta$ decay with emission of two neutrinos or Majorons in $^{76}$Ge from GERDA Phase I


Agostini, M. (Munich, Tech. U.) ; Allardt, M. (Dresden, Tech. U.) ; Bakalyarov, A.M. (Kurchatov Inst., Moscow) ; Balata, M. (Gran Sasso) ; Barabanov, I. (Rome U., Tor Vergata) ; Barros, N. (LIP, Lisbon) ; Baudis, L. (Zurich U.) ; Bauer, C. (LBNL, Berkeley) ; Becerici-Schmidt, N. (Munich, Max Planck Inst.) ; Bellotti, E. (Milan U.) ; Belogurov, S. (Moscow, ITEP) ; Belyaev, S.T. (Kurchatov Inst., Moscow) ; Benato, G. (Zurich U.) ; Bettini, A. (Padua U.) ; Bezrukov, L. (Moscow, INR) ; Bode, T. (Georgia Tech) ; Borowicz, D. (Jagiellonian U.) ; Brudanin, V. (Dubna, JINR) ; Brugnera, R. (Padua U.) ; Budjáš, D. (Munich, Tech. U.) ; Caldwell, A. (Nevis Labs, Columbia U.) ; Cattadori, C. (Milan U) ; Chernogorov, A. (Moscow, ITEP) ; D'Andrea, V. (Gran Sasso) ; Demidova, E.V. (Moscow, ITEP) ; di Vacri, A. ; Domula, A. (Dresden, Tech. U.) ; Doroshkevich, E. (Tubingen U., IAAT) ; Egorov, V. (Dubna, JINR) ; Falkenstein, R. (Tubingen U.) ; Fedorova, O. ; Freund, K. (Tubingen U.) ; Frodyma, N. (Jagiellonian U.) ; Gangapshev, A. (Moscow, INR) ; Garfagnini, A. (INFN, Cosenza) ; Grabmayr, P. (Tubingen U.) ; Gurentsov, V. (Rome U., Tor Vergata) ; Gusev, K. (Munich, Tech. U.) ; Hegai, A. (Tubingen U.) ; Heisel, M. (Heidelberg, Max Planck Inst.) ; Hemmer, S. (Padua U.) ; Heusser, G. (Heidelberg, Max Planck Inst.) ; Hofmann, W. (Heidelberg, Max Planck Inst.) ; Hult, M. (Geel, JRC) ; Inzhechik, L.V. (Moscow, INR) ; Csáthy, J. Janicskó (Munich, Tech. U.) ; Jochum, J. (Tubingen U.) ; Junker, M. (Gran Sasso) ; Kazalov, V. (Moscow, INR) ; Kihm, T. (Heidelberg, Max Planck Inst.) ; Kirpichnikov, I.V. (Moscow, ITEP) ; Kirsch, A. (Heidelberg, Max Planck Inst.) ; Klimenko, A. (Heidelberg, Max Planck Inst.) ; Knöpfle, K.T. (Heidelberg, Max Planck Inst.) ; Kochetov, O. (Dubna, JINR) ; Kornoukhov, V.N. (Moscow, ITEP) ; Kuzminov, V.V. (Moscow, INR) ; Laubenstein, M. (Gran Sasso) ; Lazzaro, A. (Milan U.) ; Lebedev, V.I. (Jefferson Lab) ; Lehnert, B. (Dresden, Tech. U.) ; Liao, H.Y. (Taiwan, Inst. Phys.) ; Lindner, M. (Heidelberg, Max Planck Inst.) ; Lippi, I. (Padua U.) ; Lubashevskiy, A. (Heidelberg, Max Planck Inst.) ; Lubsandorzhiev, B. (Moscow, INR) ; Lutter, G. (CENBG, Gradignan) ; Macolino, C. (Paris U., VI-VII) ; Majorovits, B. (Munich, Max Planck Inst.) ; Maneschg, W. (Heidelberg, Max Planck Inst.) ; Medinaceli, E. (Padua U.) ; Misiaszek, M. (Jagiellonian U.) ; Moseev, P. ; Nemchenok, I. (Dubna, JINR) ; Palioselitis, D. (NIKHEF, Amsterdam) ; Panas, K. ; Pandola, L. (Rome U., Tor Vergata) ; Pelczar, K. (Jagiellonian U.) ; Pullia, A. (U. Milan, Dept. Phys.) ; Riboldi, S. (Milan U.) ; Rumyantseva, N. (Dubna, JINR) ; Sada, C. (Padua U.) ; Salathe, M. (Heidelberg, Max Planck Inst.) ; Schmitt, C. (Munich U.) ; Schreiner, J. (Heidelberg, Max Planck Inst.) ; Schulz, O. (Munich, Tech. U.) ; Schwingenheuer, B. (Heidelberg, Max Planck Inst.) ; Schönert, S. (Munich, Tech. U.) ; Selivanenko, O. ; Shirchenko, M. (Kurchatov Inst., Moscow) ; Simgen, H. (Heidelberg, Max Planck Inst.) ; Smolnikov, A. (Heidelberg, Max Planck Inst.) ; Stanco, L. (INFN, Padua) ; Stepaniuk, M. ; Ur, C.A. (Padua U.) ; Vanhoefer, L. (Munich, Max Planck Inst.) ; Vasenko, A.A. (Moscow, ITEP) ; Veresnikova, A. ; von Sturm, K. (Tubingen U.) ; Wagner, V. (Prague, Tech. U.) ; Walter, M. (Zurich U.) ; Wegmann, A. (Heidelberg, Max Planck Inst.) ; Wester, T. (Dresden, Tech. U.) ; Wilsenach, H. (Dresden, Tech. U.) ; Wojcik, M. (Jagiellonian U.) ; Yanovich, E. (Rome U., Tor Vergata) ; Zavarise, P. (Gran Sasso) ; Zhitnikov, I. (Dubna, JINR) ; Zhukov, S.V. (Kurchatov Inst., Moscow) ; Zinatulina, D. (Dubna, JINR) ; Zuber, K. (Oxford U.) ; Zuzel, G. (Jagiellonian U.)

Abstract: A search for neutrinoless $\beta\beta$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10$^{23}$ yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with $^{76}$Ge. A new result for the half-life of the neutrino-accompanied $\beta\beta$ decay of $^{76}$Ge with significantly reduced uncertainties is also given, resulting in $T^{2\nu}_{1/2} = (1.926 \pm 0.095)\cdot10^{21}$ yr.

Web-Page: http://inspirehep.net/record/1338389/files/fig01-coaxBegeReadout.png; http://inspirehep.net/record/1338389/files/fig02-nnbb-phaseI.png; http://inspirehep.net/record/1338389/files/fig03-majoron-phaseI.png; http://inspirehep.net/record/1338389/files/arXiv:1501.02345.pdf


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