학술논문
Search for tri-nucleon decays of 76Ge in GERDA
Document Type
Original Paper
Author
Agostini, M.; Alexander, A.; Araujo, G.; Bakalyarov, A. M.; Balata, M.; Barabanov, I.; Baudis, L.; Bauer, C.; Belogurov, S.; Bettini, A.; Bezrukov, L.; Biancacci, V.; Bossio, E.; Bothe, V.; Brugnera, R.; Caldwell, A.; Calgaro, S.; Cattadori, C.; Chernogorov, A.; Chiu, P.-J.; Comellato, T.; D’Andrea, V.; Demidova, E. V.; Di Giacinto, A.; Di Marco, N.; Doroshkevich, E.; Fischer, F.; Fomina, M.; Gangapshev, A.; Garfagnini, A.; Gooch, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmüller, J.; Hemmer, S.; Hofmann, W.; Hult, M.; Inzhechik, L. V.; Janicskó Csáthy, J.; Jochum, J.; Junker, M.; Kazalov, V.; Kermaïdic, Y.; Khushbakht, H.; Kihm, T.; Kilgus, K.; Kirpichnikov, I. V.; Klimenko, A.; Knöpfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Krause, P.; Kuzminov, V. V.; Laubenstein, M.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Lubsandorzhiev, B.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Manzanillas, L.; Marshall, G.; Misiaszek, M.; Morella, M.; Müller, Y.; Nemchenok, I.; Neuberger, M.; Pandola, L.; Pelczar, K.; Pertoldi, L.; Piseri, P.; Pullia, A.; Rauscher, L.; Redchuk, M.; Riboldi, S.; Rumyantseva, N.; Sada, C.; Sailer, S.; Salamida, F.; Schönert, S.; Schreiner, J.; Schütt, M.; Schütz, A.-K.; Schulz, O.; Schwarz, M.; Schwingenheuer, B.; Selivanenko, O.; Shevchik, E.; Shirchenko, M.; Shtembari, L.; Simgen, H.; Smolnikov, A.; Stukov, D.; Sullivan, S.; Vasenko, A. A.; Veresnikova, A.; Vignoli, C.; von Sturm, K.; Wester, T.; Wiesinger, C.; Wojcik, M.; Yanovich, E.; Zatschler, B.; Zhitnikov, I.; Zhukov, S. V.; Zinatulina, D.; Zschocke, A.; Zsigmond, A. J.; Zuber, K.; Zuzel, G.;
Source
The European Physical Journal C: Particles and Fields. 83(9)
Subject
Language
English
ISSN
1434-6052
Abstract
We search for tri-nucleon decays of 7673737373737373m7673m×26Ge 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 7673737373737373m7673m×26Cu, 7673737373737373m7673m×26Zn, and 7673737373737373m7673m×26Ga nuclei, respectively. These nuclei are unstable and eventually proceed by the beta decay of 7673737373737373m7673m×26Ga to 7673737373737373m7673m×26Ge (stable). We search for the 7673737373737373m7673m×26Ga decay exploiting the fact that it dominantly populates the 66.7 keV 7673737373737373m7673m×26Ga state with half-life of 0.5 s. The nnn-decays of 7673737373737373m7673m×26Ge that proceed via 7673737373737373m7673m×26Ge 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 1.27673737373737373m7673m×26107673737373737373m7673m×26 yr (90% credible interval). This result improves previous limits for tri-nucleon decays by one to three orders of magnitude.