Probing Majorana neutrinos with double-β decay

Agostini, M.; Bakalyarov, A.M.; Balata, M.; Barabanov, I.; Baudis, L.; Bauer, C.; Bellotti, E.; Belogurov, S.; Bettini, A.; Bezrukov, L.; Borowicz, D.; Brudanin, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; Comellato, T.; D'Andrea, V.; Demidova, E.V.; Di Marco, N.; Domula, A.; Doroshkevich, E.; Egorov, V.; Falkenstein, R.; Fomina, M.; Gangapshev, A.; Garfagnini, A.; Giordano, M.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmuller, J.; Hegai, A.; Heisel, M.; Hemmer, S.; Hiller, R.; Hofmann, W.; Hult, M.; Inzhechik, L.V.; Csathy, J.J.; Jochum, J.; Junker, M.; Kazalov, V.; Kermaidic, Y.; Kihm, T.; Kirpichnikov, I.V.; Kirsch, A.; Kish, A.; Klimenko, A.; Kneissl, R.; Knopfle, K.T.; Kochetov, O.; Kornoukhov, V.N.; Krause, P.; Kuzminov, V.V.; Laubenstein, M.; Lazzaro, A.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Lubsandorzhiev, B.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Miloradovic, M.; Mingazheva, R.; Misiaszek, M.; Moseev, P.; Nemchenok, I.; Panas, K.; Pandola, L.; Pelczar, K.; Pertoldi, L.; Piseri, P.; Pullia, A.; Ransom, C.; Riboldi, S.; Rumyantseva, N.; Sada, C.; Sala, E.; Salamida, F.; Schmitt, C.; Schneider, B.; Schonert, S.; Schutz, A.-.; Schulz, O.; Schwarz, M.; Schwingenheuer, B.; Selivanenko, O.; Shevchik, E.; Shirchenko, M.; Simgen, H.; Smolnikov, A.; Stanco, L.; Stukov, D.; Vanhoefer, L.; Vasenko, A.A.; Veresnikova, A.; Von Sturm, K.; Wagner, V.; Wegmann, A.; Wester, T.; Wiesinger, C.; Wojcik, M.; Yanovich, E.; Zhitnikov, I.; Zhukov, S.V.; Zinatulina, D.; Zschocke, A.; Zsigmond, A.J.; Zuber, K.; Zuzel, G.

doi:10.1126/science.aav8613

A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-β (Oνββ) decay, a matter-creating process without the balancing emission of antimatter. The GERDA Collaboration searches for the Oνββ decay of 76Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg·year, we observe no signal and derive a lower half-life limit of T1/2 > 0.9 × 1026 years (90% C.L.). Our T1/2 sensitivity, assuming no signal, is 1.1 × 1026 years. Combining the latter with those from other Oνββ decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 to 0.16 electron volts.

Probing Majorana neutrinos with double-β decay / M. Agostini, A.M. Bakalyarov, M. Balata, I. Barabanov, L. Baudis, C. Bauer, E. Bellotti, S. Belogurov, A. Bettini, L. Bezrukov, D. Borowicz, V. Brudanin, R. Brugnera, A. Caldwell, C. Cattadori, A. Chernogorov, T. Comellato, V. D'Andrea, E.V. Demidova, N. Di Marco, A. Domula, E. Doroshkevich, V. Egorov, R. Falkenstein, M. Fomina, A. Gangapshev, A. Garfagnini, M. Giordano, P. Grabmayr, V. Gurentsov, K. Gusev, J. Hakenmuller, A. Hegai, M. Heisel, S. Hemmer, R. Hiller, W. Hofmann, M. Hult, L.V. Inzhechik, J.J. Csathy, J. Jochum, M. Junker, V. Kazalov, Y. Kermaidic, T. Kihm, I.V. Kirpichnikov, A. Kirsch, A. Kish, A. Klimenko, R. Kneissl, K.T. Knopfle, O. Kochetov, V.N. Kornoukhov, P. Krause, V.V. Kuzminov, M. Laubenstein, A. Lazzaro, M. Lindner, I. Lippi, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, B. Majorovits, W. Maneschg, M. Miloradovic, R. Mingazheva, M. Misiaszek, P. Moseev, I. Nemchenok, K. Panas, L. Pandola, K. Pelczar, L. Pertoldi, P. Piseri, A. Pullia, C. Ransom, S. Riboldi, N. Rumyantseva, C. Sada, E. Sala, F. Salamida, C. Schmitt, B. Schneider, S. Schonert, A.-. Schutz, O. Schulz, M. Schwarz, B. Schwingenheuer, O. Selivanenko, E. Shevchik, M. Shirchenko, H. Simgen, A. Smolnikov, L. Stanco, D. Stukov, L. Vanhoefer, A.A. Vasenko, A. Veresnikova, K. Von Sturm, V. Wagner, A. Wegmann, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, I. Zhitnikov, S.V. Zhukov, D. Zinatulina, A. Zschocke, A.J. Zsigmond, K. Zuber, G. Zuzel. - In: SCIENCE. - ISSN 0036-8075. - 365:6460(2019 Sep 27), pp. 1445-1448. [10.1126/science.aav8613]

Probing Majorana neutrinos with double-β decay

Agostini M.;Bakalyarov A. M.;Balata M.;Barabanov I.;Baudis L.;Bauer C.;Bellotti E.;Belogurov S.;Bettini A.;Bezrukov L.;Borowicz D.;Brudanin V.;Brugnera R.;Caldwell A.;Cattadori C.;Chernogorov A.;Comellato T.;D'Andrea V.;Demidova E. V.;Di Marco N.;Domula A.;Doroshkevich E.;Egorov V.;Falkenstein R.;Fomina M.;Gangapshev A.;Garfagnini A.;Giordano M.;Grabmayr P.;Gurentsov V.;Gusev K.;Hakenmuller J.;Hegai A.;Heisel M.;Hemmer S.;Hiller R.;Hofmann W.;Hult M.;Inzhechik L. V.;Csathy J. J.;Jochum J.;Junker M.;Kazalov V.;Kermaidic Y.;Kihm T.;Kirpichnikov I. V.;Kirsch A.;Kish A.;Klimenko A.;Kneissl R.;Knopfle K. T.;Kochetov O.;Kornoukhov V. N.;Krause P.;Kuzminov V. V.;Laubenstein M.;Lazzaro A.;Lindner M.;Lippi I.;Lubashevskiy A.;Lubsandorzhiev B.;Lutter G.;Macolino C.;Majorovits B.;Maneschg W.;Miloradovic M.;Mingazheva R.;Misiaszek M.;Moseev P.;Nemchenok I.;Panas K.;Pandola L.;Pelczar K.;Pertoldi L.;P. Piseri;A. Pullia;Ransom C.;S. Riboldi;Rumyantseva N.;Sada C.;Sala E.;Salamida F.;Schmitt C.;Schneider B.;Schonert S.;Schutz A. -K.;Schulz O.;Schwarz M.;Schwingenheuer B.;Selivanenko O.;Shevchik E.;Shirchenko M.;Simgen H.;Smolnikov A.;Stanco L.;Stukov D.;Vanhoefer L.;Vasenko A. A.;Veresnikova A.;Von Sturm K.;Wagner V.;Wegmann A.;Wester T.;Wiesinger C.;Wojcik M.;Yanovich E.;Zhitnikov I.;Zhukov S. V.;Zinatulina D.;Zschocke A.;Zsigmond A. J.;Zuber K.;Zuzel G.

2019

Abstract

A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-β (Oνββ) decay, a matter-creating process without the balancing emission of antimatter. The GERDA Collaboration searches for the Oνββ decay of 76Ge by operating bare germanium detectors in an active liquid argon shield. With a total exposure of 82.4 kg·year, we observe no signal and derive a lower half-life limit of T1/2 > 0.9 × 1026 years (90% C.L.). Our T1/2 sensitivity, assuming no signal, is 1.1 × 1026 years. Combining the latter with those from other Oνββ decay searches yields a sensitivity to the effective Majorana neutrino mass of 0.07 to 0.16 electron volts.

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	Settori scientifico-disciplinari dell'articolo
	
			Settore FIS/01 - Fisica Sperimentale
Settore FIS/05 - Astronomia e Astrofisica
		
	Data di pubblicazione
	
			27-set-2019
		
	Rivista in ANCE
	
			SCIENCE
		
	DOI
	
			https://dx.doi.org/10.1126/science.aav8613
		
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			01 - Articolo su periodico

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