M. Agostini,A. Alexander,G. Araujo,A. M. Bakalyarov,M. Balata,I. Barabanov,L. Baudis,C. Bauer,S. Belogurov,A. Bettini,L. Bezrukov,V. Biancacci,E. Bossio,V. Bothe,R. Brugnera,A. Caldwell,S. Calgaro,C. Cattadori,A. Chernogorov,P.-J. Chiu,T. Comellato,V. D’Andrea,E. V. Demidova,A. Di Giacinto,N. Di Marco,E. Doroshkevich,F. Fischer,M. Fomina,A. Gangapshev,A. Garfagnini,C. Gooch,P. Grabmayr,V. Gurentsov,K. Gusev,J. Hakenmüller,S. Hemmer,W. Hofmann,M. Hult,L. V. Inzhechik,J. Janicskó Csáthy,J. Jochum,M. Junker,V. Kazalov,Y. Kermaïdic,H. Khushbakht,T. Kihm,K. Kilgus,I. V. Kirpichnikov,A. Klimenko,K. T. Knöpfle,O. Kochetov,V. N. Kornoukhov,P. Krause,V. V. Kuzminov,M. Laubenstein,M. Lindner,I. Lippi,A. Lubashevskiy,B. Lubsandorzhiev,G. Lutter,C. Macolino,B. Majorovits,W. Maneschg,L. Manzanillas,G. Marshall,M. Misiaszek,M. Morella,Y. Müller,I. Nemchenok,M. Neuberger,L. Pandola,K. Pelczar,L. Pertoldi,P. Piseri,A. Pullia,L. Rauscher,M. Redchuk,S. Riboldi,N. Rumyantseva,C. Sada,S. Sailer,F. Salamida,S. Schönert,J. Schreiner,M. Schütt,A.-K. Schütz,O. Schulz,M. Schwarz,B. Schwingenheuer,O. Selivanenko,E. Shevchik,M. Shirchenko,L. Shtembari,H. Simgen,A. Smolnikov,D. Stukov,S. Sullivan,A. A. Vasenko,A. Veresnikova,C. Vignoli,K. von Sturm,T. Wester,C. Wiesinger,M. Wojcik,E. Yanovich,B. Zatschler,I. Zhitnikov,S. V. Zhukov,D. Zinatulina,A. Zschocke,A. J. Zsigmond,K. Zuber,G. Zuzel
The European physical journal. C, Particles and fields（2023）
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摘要
We search for tri-nucleon decays of ^76 Ge in the dataset from the GERmanium Detector Array (GERDA) experiment. Decays that populate excited levels of the daughter nucleus above the threshold for particle emission lead to disintegration and are not considered. The ppp-, ppn-, and pnn-decays lead to ^73 Cu, ^73 Zn, and ^73 Ga nuclei, respectively. These nuclei are unstable and eventually proceed by the beta decay of ^73 Ga to ^73 Ge (stable). We search for the ^73 Ga decay exploiting the fact that it dominantly populates the 66.7 keV ^73m Ga state with half-life of 0.5 s. The nnn-decays of ^76 Ge that proceed via ^73m Ge are also included in our analysis. We find no signal candidate and place a limit on the sum of the decay widths of the inclusive tri-nucleon decays that corresponds to a lower lifetime limit of 1.2 × 10 ^26 yr (90
