/ hep-ex arXiv:1604.01710


Measurement of the Double-Beta Decay Half-Life and Search for the Neutrinoless Double-Beta Decay of $^{48}{\rm Ca}$ with the NEMO-3 Detector


Arnold, R. (Strasbourg, IPHC) ; Augier, C. (Orsay, LAL) ; Bakalyarov, A.M. (Kurchatov Inst., Moscow) ; Baker, J.D. (Idaho Natl. Lab.) ; Barabash, A.S. (Kurchatov Inst., Moscow) ; Basharina-Freshville, A. (University Coll. London) ; Blondel, S. (Orsay, LAL) ; Blot, S. (Chicago U., EFI) ; Bongrand, M. (Orsay, LAL) ; Brudanin, V. (Dubna, JINR) ; Busto, J. (Marseille, CPPM) ; Caffrey, A.J. (Idaho Natl. Lab.) ; Calvez, S. ; Cascella, M. (Pisa U.) ; Cerna, C. (Marseille, CPPM) ; Cesar, J.P. ; Chapon, A. (Caen U.) ; Chauveau, E. (Tohoku U.) ; Chopra, A. ; Duchesneau, D. (Annecy, LAPP) ; Durand, D. (Caen U.) ; Egorov, V. (Dubna, JINR) ; Eurin, G. (University Coll. London) ; Evans, J.J. (Manchester U.) ; Fajt, L. (IEAP CTU, Prague) ; Filosofov, D. (Dubna, JINR) ; Flack, R. (Royal Holloway, U. of London) ; Garrido, X. (KIT, Karlsruhe, IKP) ; Gómez, H. (Zaragoza U.) ; Guillon, B. (LPSC, Grenoble) ; Guzowski, P. (Imperial Coll., London) ; Hodák, R. (Comenius U.) ; Huber, A. (Karlsruhe, Forschungszentrum) ; Hubert, P. (CENBG, Gradignan) ; Hugon, C. (INFN, Genoa) ; Jullian, S. (Orsay, LAL) ; Klimenko, A. (Heidelberg, Max Planck Inst.) ; Kochetov, O. (Dubna, JINR) ; Konovalov, S.I. (Kurchatov Inst., Moscow) ; Kovalenko, V. (Dubna, JINR) ; Lalanne, D. (Orsay, LAL) ; Lang, K. (Texas U.) ; Lebedev, V.I. (Kurchatov Inst., Moscow) ; Lemière, Y. (Caen U.) ; Noblet, T. Le ; Liptak, Z. (Colorado U.) ; Liu, X.R. ; Loaiza, P. (Modane, Lab. Souterrain) ; Lutter, G. (Geel, JRC) ; Mamedov, F. (IEAP CTU, Prague) ; Marquet, C. (Ecole Polytechnique, CPHT) ; Mauger, F. (ENSICAEN) ; Morgan, B. (Sheffield U.) ; Mott, J. (University Coll. London) ; Nemchenok, I. (Dubna, JINR) ; Nomachi, M. (Osaka U.) ; Nova, F. (Texas U.) ; Nowacki, F. (Louis Pasteur U., Strasbourg I) ; Ohsumi, H. (Saga U., Japan) ; Pahlka, R.B. (Texas U.) ; Perrot, F. (IRFU, SPhN, Saclay) ; Piquemal, F. (Tohoku U.) ; Povinec, P. (Comenius U.) ; Přidal, P. (IEAP CTU, Prague) ; Ramachers, Y.A. (Warwick U.) ; Remoto, A. (Annecy, LAPP) ; Reyss, J.L. (LSCE, Gif-sur-Yvette) ; Richards, B. (University Coll. London) ; Riddle, C.L. (Idaho Natl. Lab.) ; Rukhadze, E. (IEAP CTU, Prague) ; Rukhadze, N.I. (Dubna, JINR) ; Saakyan, R. (University Coll. London) ; Salazar, R. ; Sarazin, X. (Orsay, LAL) ; Shitov, Yu. (Imperial Coll., London) ; Simard, L. (DAPNIA, Saclay) ; Šimkovic, F. (Moscow, INR) ; Smetana, A. (IEAP CTU, Prague) ; Smolek, K. (IEAP CTU, Prague) ; Smolnikov, A. (Heidelberg, Max Planck Inst.) ; Söldner-Rembold, S. (Manchester U.) ; Soulé, B. (CENBG, Gradignan) ; Štekl, I. (IEAP CTU, Prague) ; Suhonen, J. (Jyvaskyla U.) ; Sutton, C.S. (Sheffield U.) ; Szklarz, G. (Orsay, LAL) ; Thomas, J. (LIGO Livingston Obs.) ; Timkin, V. (Dubna, JINR) ; Torre, S. (Frascati) ; Tretyak, Vl. I. (Kiev, INR) ; Tretyak, V.I. (Kiev, INR) ; Umatov, V.I. (Moscow, ITEP) ; Vanushin, I. (Moscow, ITEP) ; Vilela, C. (SUNY, Stony Brook) ; Vorobel, V. (Charles U.) ; Waters, D. (University Coll. London) ; Zhukov, S.V. (Kurchatov Inst., Moscow) ; Žukauskas, A. (Charles U.)

Published in: Phys.Rev.D
Pages: 8

Abstract: The NEMO-3 experiment at the Modane Underground Laboratory has investigated the double-$\beta$ decay of $^{48}{\rm Ca}$. Using $5.25$ yr of data recorded with a $6.99\,{\rm g}$ sample of $^{48}{\rm Ca}$, approximately $150$ double-$\beta$ decay candidate events have been selected with a signal-to-background ratio greater than $3$. The half-life for the two-neutrino double-$\beta$ decay of $^{48}{\rm Ca}$ has been measured to be $T^{2\nu}_{1/2}\,=\,[6.4\, ^{+0.7}_{-0.6}{\rm (stat.)} \, ^{+1.2}_{-0.9}{\rm (syst.)}] \times 10^{19}\,{\rm yr}$. A search for neutrinoless double-$\beta$ decay of $^{48}{\rm Ca}$ yields a null result and a corresponding lower limit on the half-life is found to be $T^{0\nu}_{1/2} > 2.0 \times 10^{22}\,{\rm yr}$ at $90\%$ confidence level, translating into an upper limit on the effective Majorana neutrino mass of $< m_{\beta\beta} > < 6.0 - 26$ ${\rm eV}$, with the range reflecting different nuclear matrix element calculations. Limits are also set on models involving Majoron emission and right-handed currents.

Web-Page: http://inspirehep.net/record/1444346/files/sourcePhotoWide_v2.png; http://inspirehep.net/record/1444346/files/Ca48_1e1g_totEnergy_v3.png; http://inspirehep.net/record/1444346/files/Ca48_1e1a_alphaL_Lin_v3.png; http://inspirehep.net/record/1444346/files/Ca48_1e_eEnergy_v4.png; http://inspirehep.net/record/1444346/files/Ca48_2e_sumE_withRatio.png; http://inspirehep.net/record/1444346/files/arXiv:1604.01710.pdf


Note: 8 pages, 5 figures, 3 tables. Submitted to Phys. Rev. D

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