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1. Limits on uranium and thorium bulk content in GERDA Phase I detectors

Author

GERDA collaboration, Agostini, M., Allardt, M., Bakalyarov, A. M., Balata, M., Barabanov, I., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Grabmayr, P., Gurentsov, V., Gusev, K., Hakemüller, J., Hegai, A., Heisel, M., Hemmer, S., Hofmann, W., Hult, M., Inzhechik, L. V., Csathy, J. Janicsko, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Kish, A., Klimenko, A., Kneißl, R., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Medinaceli, E., Mingazheva, R., Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salamida, F., Salathe, M., Schmitt, C., Schneider, B., Schönert, S., Schreiner, J., Schütz, A. -K., Schulz, O., Schwingenheuer, B., Selivanenko, O., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., Vanhoefer, L., Vasenko, A. A., Veresnikova, A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wiesinger, C., Wojcik, M., Yanovich, E., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Internal contaminations of $^{238}$U, $^{235}$U and $^{232}$Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of $^{76}$Ge. The data from GERDA Phase~I have been analyzed for alpha events from the decay chain of these contaminations by looking for full decay chains and for time correlations between successive decays in the same detector. No candidate events for a full chain have been found. Upper limits on the activities in the range of a few nBq/kg for $^{226}$Ra, $^{227}$Ac and $^{228}$Th, the long-lived daughter nuclides of $^{238}$U, $^{235}$U and $^{232}$Th, respectively, have been derived. With these upper limits a background index in the energy region of interest from $^{226}$Ra and $^{228}$Th contamination is estimated which satisfies the prerequisites of a future ton scale germanium double beta decay experiment., Comment: 2 figures, 7 pages

Published
2016
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2. Flux Modulations seen by the Muon Veto of the GERDA Experiment

Author

Agostini, M., Allardt, M., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knapp, M., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Medinaceli, E., Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Ritter, F., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schneider, B., Schönert, S., Schreiner, J., Schütz, A. -K., Schulz, O., Schwingenheuer, B., Selivanenko, O., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., Strecker, H., Vanhoefer, L., Vasenko, A. A., Veresnikova, A., vonSturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

The GERDA experiment at LNGS of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66~PMTs in the water tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two effects have been identified which are caused by secondary muons from the CNGS neutrino beam (2.2 %) and a temperature modulation of the atmosphere (1.4 %). A mean cosmic muon rate of $I^0_{\mu} = (3.477 \pm 0.002_{\textrm{stat}} \pm 0.067_{\textrm{sys}}) \times 10^{-4}$/(s$\cdot$m$^2$) was found in good agreement with other experiments at LNGS at a depth of 3500~meter water equivalent., Comment: 7 pages, 6 figures

Published
2016
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3. Limits on uranium and thorium bulk content in GERDA Phase I detectors

Author

collaboration, G, Agostini, M, Allardt, M, Bakalyarov, AM, Balata, M, Barabanov, I, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Caldwell, A, Cattadori, C, Chernogorov, A, D'Andrea, V, Demidova, EV, di Vacri, A, Domula, A, Doroshkevich, E, Egorov, V, Falkenstein, R, Fedorova, O, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Grabmayr, P, Gurentsov, V, Gusev, K, Hakemüller, J, Hegai, A, Heisel, M, Hemmer, S, Hofmann, W, Hult, M, Inzhechik, LV, Janicskó Csáthy, J, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Kish, A, Klimenko, A, Kneißl, R, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Medinaceli, E, Mingazheva, R, Misiaszek, M, Moseev, P, Nemchenok, I, Palioselitis, D, Panas, K, Pandola, L, Pelczar, K, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salamida, F, Salathe, M, Schmitt, C, Schneider, B, Schönert, S, Schreiner, J, Schütz, AK, Schulz, O, Schwingenheuer, B, Selivanenko, O, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, and Stepaniuk, M

Subjects
Germanium detectors, Double beta decay, Radiopurity, Uranium and thorium bulk content, physics.ins-det, nucl-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Internal contaminations of 238U, 235U and 232Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of 76Ge. The data from GERDA Phase I have been analyzed for alpha events from the decay chain of these contaminations by looking for full decay chains and for time correlations between successive decays in the same detector. No candidate events for a full chain have been found. Upper limits on the activities in the range of a few nBq/kg for 226Ra, 227Ac and 228Th, the long-lived daughter nuclides of 238U, 235U and 232Th, respectively, have been derived. With these upper limits a background index in the energy region of interest from 226Ra and 228Th contamination is estimated which satisfies the prerequisites of a future ton scale germanium double beta decay experiment.

Published
2017

4. Limits on uranium and thorium bulk content in Gerda Phase I detectors

Author

collaboration, GERDA, Agostini, M, Allardt, M, Bakalyarov, AM, Balata, M, Barabanov, I, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, di Vacri, A, Domula, A, Doroshkevich, E, Egorov, V, Falkenstein, R, Fedorova, O, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Grabmayr, P, Gurentsov, V, Gusev, K, Hakemüller, J, Hegai, A, Heisel, M, Hemmer, S, Hofmann, W, Hult, M, Inzhechik, LV, Csáthy, J Janicskó, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Kish, A, Klimenko, A, Kneißl, R, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Medinaceli, E, Mingazheva, R, Misiaszek, M, Moseev, P, Nemchenok, I, Palioselitis, D, Panas, K, Pandola, L, Pelczar, K, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salamida, F, Salathe, M, Schmitt, C, Schneider, B, Schönert, S, Schreiner, J, Schütz, A-K, Schulz, O, Schwingenheuer, B, Selivanenko, O, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, and Stepaniuk, M

Subjects
Germanium detectors, Double beta decay, Radiopurity, Uranium and thorium bulk content, physics.ins-det, nucl-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Internal contaminations of 238U, 235U and 232Th in the bulk of high purity germanium detectors are potential backgrounds for experiments searching for neutrinoless double beta decay of 76Ge. The data from GERDA Phase I have been analyzed for alpha events from the decay chain of these contaminations by looking for full decay chains and for time correlations between successive decays in the same detector. No candidate events for a full chain have been found. Upper limits on the activities in the range of a few nBq/kg for 226Ra, 227Ac and 228Th, the long-lived daughter nuclides of 238U, 235U and 232Th, respectively, have been derived. With these upper limits a background index in the energy region of interest from 226Ra and 228Th contamination is estimated which satisfies the prerequisites of a future ton scale germanium double beta decay experiment.

Published
2017

5. $2\nu\beta\beta$ decay of $^{76}$Ge into excited states with GERDA Phase I

Author

Agostini, M., Allardt, M., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gooch, C., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Medinaceli, E., Mi, Y., Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schneider, B., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Schütz, A-K., Selivanenko, O., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., Ur, C. A., Vanhoefer, L., Vasenko, A. A., Veresnikova, A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Two neutrino double beta decay of $^{76}$Ge to excited states of $^{76}$Se has been studied using data from Phase I of the GERDA experiment. An array composed of up to 14 germanium detectors including detectors that have been isotopically enriched in $^{76}$Ge was deployed in liquid argon. The analysis of various possible transitions to excited final states is based on coincidence events between pairs of detectors where a de-excitation $\gamma$ ray is detected in one detector and the two electrons in the other. No signal has been observed and an event counting profile likelihood analysis has been used to determine Frequentist 90\,\% C.L. bounds for three transitions: ${0^+_{\rm g.s.}-2^+_1}$: $T^{2\nu}_{1/2}>$1.6$\cdot10^{23}$ yr, ${0^+_{\rm g.s.}-0^+_1}$: $T^{2\nu}_{1/2}>$3.7$\cdot10^{23}$ yr and ${0^+_{\rm g.s.}-2^+_2}$: $T^{2\nu}_{1/2}>$2.3$\cdot10^{23}$ yr. These bounds are more than two orders of magnitude larger than those reported previously. Bayesian 90\,\% credibility bounds were extracted and used to exclude several models for the ${0^+_{\rm g.s.}-0^+_1}$ transition.

Published
2015
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6. Improvement of the Energy Resolution via an Optimized Digital Signal Processing in GERDA Phase I

Author

Agostini, M., Allardt, M., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Medinaceli, E., Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schneider, B., Schönert, S., Schreiner, J., Schütz, A. -K., Schulz, O., Schwingenheuer, B., Selivanenko, O., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., Ur, C. A., Vanhoefer, L., Vasenko, A. A., Veresnikova, A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

An optimized digital shaping filter has been developed for the GERDA experiment which searches for neutrinoless double beta decay in 76Ge. The GERDA Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) at the 76Ge Q value for 0\nu\beta\beta decay is obtained. This is possible thanks to the enhanced low-frequency noise rejection of this Zero Area Cusp (ZAC) signal shaping fillter., Comment: 12 pages, 16 figures

Published
2015

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

Author

Agostini, M., Allardt, M., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Medinaceli, E., Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Selivanenko, O., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., Ur, C. A., Vanhoefer, L., Vasenko, A. A., Veresnikova, A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
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., Comment: 3 Figures

Published
2015
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8. Flux modulations seen by the muon veto of the Gerda experiment

Author

collaboration, GERDA, Agostini, M, Allardt, M, Bakalyarov, AM, Balata, M, Barabanov, I, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, di Vacri, A, Domula, A, Doroshkevich, E, Egorov, V, Falkenstein, R, Fedorova, O, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Grabmayr, P, Gurentsov, V, Gusev, K, Hegai, A, Heisel, M, Hemmer, S, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Cs’athy, J Janicsk’o, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knapp, M, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Medinaceli, E, Misiaszek, M, Moseev, P, Nemchenok, I, Palioselitis, D, Panas, K, Pandola, L, Pelczar, K, Pullia, A, Riboldi, S, Ritter, F, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schneider, B, Schönert, S, Schreiner, J, Schütz, A-K, Schulz, O, Schwingenheuer, B, Selivanenko, O, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Stepaniuk, M, and Strecker, H

Subjects
Water cherenkov detector, Underground experiment, Cosmic rays, Muon interaction, physics.ins-det, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

The GERDA experiment at LNGS of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66 PMTs in the water tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two causes have been identified: (i) secondary muons from the CNGS neutrino beam (2.2%) and (ii) a temperature modulation of the atmosphere (1.4%). A mean cosmic muon rate of Iμ0=(3.477±0.002stat±0.067sys)×10−4/(s · m2) was found in good agreement with other experiments at LNGS. Combining the present result with those from previous experiments at LNGS the effective temperature coefficient αT,Lngs is determined to 0.93 ± 0.03. A fit of the temperature coefficients measured at various underground sites yields a kaon to pion ratio rK/π of 0.10 ± 0.03.

Published
2016

9. Flux modulations seen by the muon veto of the GERDA experiment

Author

Agostini, M, Balata, M, D'Andrea, V, di Vacri, A, Ioannucci, L, Junker, M, Laubenstein, M, Macolino, C, Pandola, L, Borowicz, D, Frodyma, N, Misiaszek, M, Panas, K, Pelczar, K, Wojcik, M, Zuzel, G, Allardt, M, Barros, N, Domula, A, Lehnert, B, Schneider, B, Wester, T, Wilsenach, H, Zuber, K, Brudanin, V, Egorov, V, Gusev, K, Klimenko, A, Kochetov, O, Lubashevskiy, A, Nemchenok, I, Rumyantseva, N, Shevchik, E, Shirchenko, M, Zhitnikov, I, Zinatulina, D, Hult, M, Lutter, G, Bauer, C, Gangapshev, A, Heisel, M, Hofmann, W, Kihm, T, Kirsch, A, Knöpfle, KT, Lindner, M, Maneschg, W, Salathe, M, Schreiner, J, Schwingenheuer, B, Simgen, H, Smolnikov, A, Stepaniuk, M, Strecker, H, Wagner, V, Wegmann, A, Bellotti, E, Cattadori, C, Pullia, A, Riboldi, S, Barabanov, I, Belogurov, S, Bezrukov, L, Doroshkevich, E, Fedorova, O, Gurentsov, V, Inzhechik, LV, Kazalov, V, Kornoukhov, VN, Kuzminov, VV, Lubsandorzhiev, B, Moseev, P, Selivanenko, O, Veresnikova, A, Yanovich, E, Chernogorov, A, Demidova, EV, Kirpichnikov, IV, Vasenko, AA, Bakalyarov, AM, Belyaev, ST, Lebedev, VI, Zhukov, SV, Becerici-Schmidt, N, Caldwell, A, Liao, HY, Majorovits, B, Palioselitis, D, Schulz, O, Vanhoefer, L, Bode, T, Janicsk'o Cs'athy, J, Lazzaro, A, Schönert, S, Wiesinger, C, Bettini, A, Brugnera, R, Garfagnini, A, Hemmer, S, and Medinaceli, E

Subjects
Water cherenkov detector, Underground experiment, Cosmic rays, Muon interaction, physics.ins-det, hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The GERDA experiment at LNGS of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66 PMTs in the water tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two causes have been identified: (i) secondary muons from the CNGS neutrino beam (2.2%) and (ii) a temperature modulation of the atmosphere (1.4%). A mean cosmic muon rate of Iμ0=(3.477±0.002stat±0.067sys)×10−4/(s · m2) was found in good agreement with other experiments at LNGS. Combining the present result with those from previous experiments at LNGS the effective temperature coefficient αT,Lngs is determined to 0.93 ± 0.03. A fit of the temperature coefficients measured at various underground sites yields a kaon to pion ratio rK/π of 0.10 ± 0.03.

Published
2016

10. Search of Neutrinoless Double Beta Decay with the GERDA Experiment

Author

Agostini, M, Allardt, M, Bakalyarov, AM, Balata, M, Barabanov, I, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, D'Andrea, V, Demidova, EV, Domula, A, Doroshkevich, E, Egorov, V, Falkenstein, R, Fedorova, O, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gooch, C, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hoffmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Csáthy, J Janicksó, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Marissens, G, Medinaceli, E, Misiaszek, M, Moseev, P, Nemchenok, I, Nisi, S, Palioselitis, D, Panas, K, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Reissfelder, M, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schneider, B, Schreiner, J, Schulz, O, Schwingenheuer, B, Schönert, S, Seitz, H, Selivalenko, O, Shevchik, E, Shirchenko, M, and Simgen, H

Subjects
neutrinoless double beta decay, T-1/2(0 nu), Ge-76, enriched Ge detectors
Abstract

The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0νββ) in 76Ge, located at Laboratori Nazionali del Gran Sasso of INFN (Italy). In the first phase of the experiment, a 90% confidence level (C.L.) sensitivity of 2.4·1025 yr on the 0νββ decay half-life was achieved with a 21.6 kg·yr exposure and an unprecedented background index in the region of interest of 10-2 counts/(keV·kg·yr). No excess of signal events was found, and an experimental lower limit on the half-life of 2.1 · 1025 yr (90% C.L.) was established. Correspondingly, the limit on the effective Majorana neutrino mass is mee

Published
2016

11. Production, characterization and operation of $^{76}$Ge enriched BEGe detectors in GERDA

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjas, D., Caldwel, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csathy, J. Janicsko, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Palioselitis, D., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Ur, C. A., Vanhoefer, L., Vasenko, A. A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

The GERmanium Detector Array (GERDA) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0{\nu}{\beta}{\beta}) of $^{76}$Ge. Germanium detectors made of material with an enriched $^{76}$Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of the experiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new $^{76}$Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in GERDA during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the $^{76}$Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of GERDA Phase~II., Comment: 23 pages, 21 figures

Published
2014
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12. Results on ββ decay with emission of two neutrinos or Majorons in 76Ge from GERDA Phase I: GERDA Collaboration

Author

GERDA Collaboration, Agostini, M, Allardt, M, Bakalyarov, AM, Balata, M, Barabanov, I, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, di Vacri, A, Domula, A, Doroshkevich, E, Egorov, V, Falkenstein, R, Fedorova, O, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Grabmayr, P, Gurentsov, V, Gusev, K, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Csáthy, JJ, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Medinaceli, E, Misiaszek, M, Moseev, P, Nemchenok, I, Palioselitis, D, Panas, K, Pandola, L, Pelczar, K, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schneider, B, Schönert, S, Schreiner, J, Schütz, AK, Schulz, O, Schwingenheuer, B, Selivanenko, O, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Stepaniuk, M, Ur, CA, Vanhoefer, L, and Vasenko, AA

Subjects
nucl-ex, physics.ins-det, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

A search for neutrinoless ββ 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 1023 yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with 76Ge. A new result for the half-life of the neutrino-accompanied ββ decay of 76Ge with significantly reduced uncertainties is also given, resulting in (Formula presented.) yr.

Published
2015

13. Improvement of the energy resolution via an optimized digital signal processing in GERDA Phase I

Author

GERDA Collaboration, Agostini, M, Allardt, M, Bakalyarov, AM, Balata, M, Barabanov, I, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, Vacri, AD, Domula, A, Doroshkevich, E, Egorov, V, Falkenstein, R, Fedorova, O, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Grabmayr, P, Gurentsov, V, Gusev, K, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Janicskó Csáthy, J, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Medinaceli, E, Misiaszek, M, Moseev, P, Nemchenok, I, Palioselitis, D, Panas, K, Pandola, L, Pelczar, K, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schneider, B, Schönert, S, Schreiner, J, Schütz, AK, Schulz, O, Schwingenheuer, B, Selivanenko, O, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Stepaniuk, M, Ur, CA, Vanhoefer, L, and Vasenko, AA

Subjects
physics.ins-det, nucl-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

An optimized digital shaping filter has been developed for the Gerda experiment which searches for neutrinoless double beta decay in $$^{76}$$76Ge. The Gerda Phase I energy calibration data have been reprocessed and an average improvement of 0.3 keV in energy resolution (FWHM) corresponding to 10 % at the $$Q$$Q value for $$0\nu \beta \beta $$0νββ decay in $$^{76}$$76Ge is obtained. This is possible thanks to the enhanced low-frequency noise rejection of this Zero Area Cusp (ZAC) signal shaping filter.

Published
2015

14. Production, characterization and operation of 76Ge enriched BEGe detectors in GERDA

Author

Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, AM, Balata, M, Barabanov, I, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, Domula, A, Egorov, V, Falkenstein, R, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Janicskó Csáthy, J, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Misiaszek, M, Nemchenok, I, Nisi, S, O’Shaughnessy, C, Palioselitis, D, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schreiner, J, Schulz, O, Schütz, A-K, Schwingenheuer, B, Schönert, S, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Strecker, H, Ur, CA, Vanhoefer, L, Vasenko, AA, von Sturm, K, and Wagner, V

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, physics.ins-det, hep-ex, nucl-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

The GERmanium Detector Array (Gerda) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0νββ) of 76Ge. Germanium detectors made of material with an enriched 76Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of theexperiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new 76Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in Gerda during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the 76Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of Gerda Phase II.

Published
2015

15. Results on neutrinoless double beta decay of 76Ge from GERDA Phase I

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Heider, M. Barnabé, Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A. A., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Pandola, L., Pelczar, K., Pessina, G., Potenza, %F., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C. A., Vasenko, A. A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the Standard Model of particle physics. This Letter reports the results from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope 76Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kgyr. A blind analysis is performed. The background index is about 1.10^{-2} cts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of 76Ge, T_1/2 > 2.1 10^{25} yr (90% C.L.). The combination with the results from the previous experiments with 76Ge yields T_1/2 > 3.0 10^{25} yr (90% C.L.)., Comment: 6 pages, 2 figures

Published
2013
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16. Pulse shape discrimination for GERDA Phase I data

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Heider, M. Barnabe, Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A. A., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C. A., Vasenko, A. A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The GERDA experiment located at the LNGS searches for neutrinoless double beta (0\nu\beta\beta) decay of ^{76}Ge using germanium diodes as source and detector. In Phase I of the experiment eight semi-coaxial and five BEGe type detectors have been deployed. The latter type is used in this field of research for the first time. All detectors are made from material with enriched ^{76}Ge fraction. The experimental sensitivity can be improved by analyzing the pulse shape of the detector signals with the aim to reject background events. This paper documents the algorithms developed before the data of Phase I were unblinded. The double escape peak (DEP) and Compton edge events of 2.615 MeV \gamma\ rays from ^{208}Tl decays as well as 2\nu\beta\beta\ decays of ^{76}Ge are used as proxies for 0\nu\beta\beta\ decay. For BEGe detectors the chosen selection is based on a single pulse shape parameter. It accepts 0.92$\pm$0.02 of signal-like events while about 80% of the background events at Q_{\beta\beta}=2039 keV are rejected. For semi-coaxial detectors three analyses are developed. The one based on an artificial neural network is used for the search of 0\nu\beta\beta\ decay. It retains 90% of DEP events and rejects about half of the events around Q_{\beta\beta}. The 2\nu\beta\beta\ events have an efficiency of 0.85\pm0.02 and the one for 0\nu\beta\beta\ decays is estimated to be 0.90^{+0.05}_{-0.09}. A second analysis uses a likelihood approach trained on Compton edge events. The third approach uses two pulse shape parameters. The latter two methods confirm the classification of the neural network since about 90% of the data events rejected by the neural network are also removed by both of them. In general, the selection efficiency extracted from DEP events agrees well with those determined from Compton edge events or from 2\nu\beta\beta\ decays., Comment: 18 pages, 27 figures

Published
2013
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17. The background in the neutrinoless double beta decay experiment GERDA

Author

The GERDA collaboration, Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Heider, M. Barnabe, Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csathy, J. Janicsko, Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knoepfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A. A., Majorovits, B., Maneschg, W., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Palioselitis, D., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schoenert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C. A., Vasenko, A. A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta decay of 76Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Q-value of the decay, Q_bb. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around Q_bb. The main parameters needed for the neutrinoless double beta decay analysis are described. A background model was developed to describe the observed energy spectrum. The model contains several contributions, that are expected on the basis of material screening or that are established by the observation of characteristic structures in the energy spectrum. The model predicts a flat energy spectrum for the blinding window around Q_bb with a background index ranging from 17.6 to 23.8*10^{-3} counts/(keV kg yr). A part of the data not considered before has been used to test if the predictions of the background model are consistent. The observed number of events in this energy region is consistent with the background model. The background at Q-bb is dominated by close sources, mainly due to 42K, 214Bi, 228Th, 60Co and alpha emitting isotopes from the 226Ra decay chain. The individual fractions depend on the assumed locations of the contaminants. It is shown, that after removal of the known gamma peaks, the energy spectrum can be fitted in an energy range of 200 kev around Q_bb with a constant background. This gives a background index consistent with the full model and uncertainties of the same size.

Published
2013
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18. Background modeling for the GERDA experiment

Author

Becerici-Schmidt, N.

Subjects
Physics - Data Analysis, Statistics and Probability, Nuclear Experiment
Abstract

The neutrinoless double beta (0nubb) decay experiment GERDA at the LNGS of INFN has started physics data taking in November 2011. This paper presents an analysis aimed at understanding and modeling the observed background energy spectrum, which plays an essential role in searches for a rare signal like 0nubb decay. A very promising preliminary model has been obtained, with the systematic uncertainties still under study. Important information can be deduced from the model such as the expected background and its decomposition in the signal region. According to the model the main background contributions around Qbb come from Bi-214, Th-228, K-42, Co-60 and alpha emitting isotopes in the Ra-226 decay chain, with a fraction depending on the assumed source positions., Comment: 5 pages, 5 figures, used the template for the LaTeX class aipproc, contribution to LRT 2013, to be published in AIP Conference Proceedings

Published
2013
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19. The GERDA experiment for the search of 0\nu\beta\beta\ decay in ^{76}Ge

Author

GERDA Collaboration, Ackermann, K. -H., Agostini, M., Allardt, M., Altmann, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Heider, M. Barnabe, Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., Chkvorets, O., Cossavella, F., D`Andragora, A., Demidova, E. V., Denisov, A., di Vacri, A., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Froborg, F., Frodyma, N., Gangapshev, A., Garfagnini, A., Gasparro, J., Gazzana, S., de Orduna, R. Gonzalez, Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csalty, J. Janicsko, Jochum, J., Junker, M., Kankanyan, R., Kianovsky, S., Kihm, T., Kiko, J., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knapp, M., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kröninger, K., Kusminov, V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Lenz, D., Liao, H., Lindner, M., Lippi, I., Liu, J., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Machado, A. A., Majorovits, B., Maneschg, W., Marissens, G., Mayer, S., Meierhofer, G., Nemchenok, I., Niedermeier, L., Nisi, S., Oehm, J., O'Shaughnessy, C., Pandola, L., Peiffer, P., Pelczar, K., Pullia, A., Riboldi, S., Ritter, F., Alvarez, C. Rossi, Sada, C., Salathe, M., Schmitt, C., Schönert, S., Schreiner, J., Schubert, J., Schulz, O., Schwan, U., Schwingenheuer, B., Seitz, H., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stelzer, F., Strecker, H., Tarka, M., Trunk, U., Ur, C. A., Vasenko, A. A., Vogt, S., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

The GERDA collaboration is performing a search for neutrinoless double beta decay of ^{76}Ge with the eponymous detector. The experiment has been installed and commissioned at the Laboratori Nazionali del Gran Sasso and has started operation in November 2011. The design, construction and first operational results are described, along with detailed information from the R&D phase., Comment: 31 pages, 23 figures, submitted to EPJC

Published
2012
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20. Measurement of the half-life of the two-neutrino double beta decay of Ge-76 with the Gerda experiment

Author

GERDA Collaboration, Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Heider, M. Barnabe, Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E. V., Denisov, A., Domula, A., Egorov, V., Falkenstein, R., Ferella, A. D., Freund, K., Froborg, F., Frodyma, N., Gangapshev, A., Garfagnini, A., Gazzana, S., Grambayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csathy, J. Janicsko, Jochum, J., Junker, M., Kianovsky, S., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knoepfle, K. T., Kochetov, O., Kornoukhov, V. N., Kusminov, V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Machado, A. A., Majorovits, B., Maneschg, W., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Pandola, L., Pelczar, K., Peraro, L., Pullia, A., Riboldi, S., Ritter, F., Sada, C., Salathe, M., Schmitt, C., Schoenert, S., Schreiner, J., Schulz, O., Schwingenheuer, B., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C. A., Vasenko, A. A., Volynets, O., von Sturm, K., Walter, M., Wegmann, A., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

The primary goal of the GERmanium Detector Array (Gerda) experiment at the Laboratori Nazionali del Gran Sasso of INFN is the search for the neutrinoless double beta decay of Ge-76. High-purity germanium detectors made from material enriched in Ge-76 are operated directly immersed in liquid argon, allowing for a substantial reduction of the background with respect to predecessor experiments. The first 5.04 kg yr of data collected in Phase I of the experiment have been analyzed to measure the half-life of the neutrino-accompanied double beta decay of Ge-76. The observed spectrum in the energy range between 600 and 1800 keV is dominated by the double beta decay of Ge-76. The half-life extracted from Gerda data is T(1/2) = (1.84 +0.14 -0.10) 10^{21} yr., Comment: 14 pages, 2 figures, submitted to J. Phys. G: Nucl. Part. Phys

Published
2012
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21. The background in the 0νββ experiment Gerda

Author

Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, AM, Balata, M, Barabanov, I, Heider, MB, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, Cossavella, F, Demidova, EV, Domula, A, Egorov, V, Falkenstein, R, Ferella, A, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Guthikonda, KK, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Csáthy, JJ, Jochum, J, Junker, M, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Liu, X, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Machado, AA, Majorovits, B, Maneschg, W, Nemchenok, I, Nisi, S, O’Shaughnessy, C, Palioselitis, D, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, Sada, C, Salathe, M, Schmitt, C, Schreiner, J, Schulz, O, Schwingenheuer, B, Schönert, S, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Strecker, H, Tarka, M, Ur, CA, Vasenko, AA, and Volynets, O

Subjects
physics.ins-det, hep-ex, Nuclear & Particles Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta (0νββ) decay of 76Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Qββ value of the decay. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around Qββ. The main parameters needed for the 0νββ analysis are described. A background model was developed to describe the observed energy spectrum. The model contains several contributions, that are expected on the basis of material screening or that are established by the observation of characteristic structures in the energy spectrum. The model predicts a flat energy spectrum for the blinding window around Qββ with a background index ranging from 17.6 to 23.8 × 10−3 cts/(keV kg yr). A part of the data not considered before has been used to test if the predictions of the background model are consistent. The observed number of events in this energy region is consistent with the background model. The background at Qββ is dominated by close sources, mainly due to 42K, 214Bi, 228Th, 60Co and α emitting isotopes from the 226Ra decay chain. The individual fractions depend on the assumed locations of the contaminants. It is shown, that after removal of the known γ peaks, the energy spectrum can be fitted in an energy range of 200 keV around Qββ with a constant background. This gives a background index consistent with the full model and uncertainties of the same size.

Published
2014

22. Pulse shape discrimination for GERDA Phase I data

Author

Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, AM, Balata, M, Barabanov, I, Heider, MB, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, Cossavella, F, Demidova, EV, Domula, A, Egorov, V, Falkenstein, R, Ferella, A, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Guthikonda, KK, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Csáthy, JJ, Jochum, J, Junker, M, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Liu, X, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Machado, AA, Majorovits, B, Maneschg, W, Misiaszek, M, Nemchenok, I, Nisi, S, O’Shaughnessy, C, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schreiner, J, Schulz, O, Schwingenheuer, B, Schönert, S, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Strecker, H, Tarka, M, Ur, CA, and Vasenko, AA

Subjects
physics.ins-det, nucl-ex, Nuclear & Particles Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The GERDA experiment located at the Laboratori Nazionali del Gran Sasso of INFN searches for neutrinoless double beta (0νββ) decay of 76Ge using germanium diodes as source and detector. In Phase I of the experiment eight semi-coaxial and five BEGe type detectors have been deployed. The latter type is used in this field of research for the first time. All detectors are made from material with enriched 76Ge fraction. The experimental sensitivity can be improved by analyzing the pulse shape of the detector signals with the aim to reject background events. This paper documents the algorithms developed before the data of Phase I were unblinded. The double escape peak (DEP) and Compton edge events of 2.615 MeV γ rays from 208Tl decays as well as two-neutrino double beta (2νββ) decays of 76Ge are used as proxies for 0νββ decay. For BEGe detectors the chosen selection is based on a single pulse shape parameter. It accepts 0.92 ± 0.02 of signal-like events while about 80 % of the background events at Qββ = 2039 keV are rejected. For semi-coaxial detectors three analyses are developed. The one based on an artificial neural network is used for the search of 0νββ decay. It retains 90 % of DEP events and rejects about half of the events around Qββ. The 2νββ events have an efficiency of 0.85±0.02 and the one for 0νββ decays is estimated to be 0.90+0.05−0.09. A second analysis uses a likelihood approach trained on Compton edge events. The third approach uses two pulse shape parameters. The latter two methods confirm the classification of the neural network since about 90 % of the data events rejected by the neural network are also removed by both of them. In general, the selection efficiency extracted from DEP events agrees well with those determined from Compton edge events or from 2νββ decays.

Published
2013

23. The Gerda experiment for the search of 0νββ decay in 76Ge

Author

Ackermann, K-H, Agostini, M, Allardt, M, Altmann, M, Andreotti, E, Bakalyarov, AM, Balata, M, Barabanov, I, Barnabé Heider, M, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, Chkvorets, O, Cossavella, F, D‘Andragora, A, Demidova, EV, Denisov, A, di Vacri, A, Domula, A, Egorov, V, Falkenstein, R, Ferella, A, Freund, K, Froborg, F, Frodyma, N, Gangapshev, A, Garfagnini, A, Gasparro, J, Gazzana, S, Gonzalez de Orduna, R, Grabmayr, P, Gurentsov, V, Gusev, K, Guthikonda, KK, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Janicskó Csáthy, J, Jochum, J, Junker, M, Kankanyan, R, Kianovsky, S, Kihm, T, Kiko, J, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knapp, M, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kröninger, K, Kusminov, V, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Lenz, D, Liao, H, Lindner, M, Lippi, I, Liu, J, Liu, X, Lubashevskiy, A, Lubsandorzhiev, B, Machado, AA, Majorovits, B, Maneschg, W, Marissens, G, Mayer, S, Meierhofer, G, Nemchenok, I, Niedermeier, L, Nisi, S, Oehm, J, O’Shaughnessy, C, Pandola, L, Peiffer, P, Pelczar, K, and Pullia, A

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, physics.ins-det, hep-ex, nucl-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

The Gerda collaboration is performing a search for neutrinoless double beta decay of 76Ge with the eponymous detector. The experiment has been installed and commissioned at the Laboratori Nazionali del Gran Sasso and has started operation in November 2011. The design, construction and first operational results are described, along with detailed information from the R&D phase. © 2013 The Author(s).

Published
2013

24. Search of Neutrinoless Double Beta Decay with the GERDA Experiment

Author

Agostini, M., Allardt, M., Bakalyarov, A.M., Balata, M., Barabanov, I., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S.T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E.V., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gooch, C., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hoffmann, W., Hult, M., Inzhechik, L.V., Ioannucci, L., Janicksó Csáthy, J., Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I.V., Kirsch, A., Klimenko, A., Knöpfle, K.T., Kochetov, O., Kornoukhov, V.N., Kuzminov, V.V., Laubenstein, M., Lazzaro, A., Lebedev, V.I., Lehnert, B., Liao, H.Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Marissens, G., Medinaceli, E., Misiaszek, M., Moseev, P., Nemchenok, I., Nisi, S., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Reissfelder, M., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schneider, B., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Seitz, H., Selivalenko, O., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., Strecker, H., Ur, C.A., Vanhoefer, L., Vasenko, A.A., Veresnikova, A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wiesinger, C., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S.V., Zinatulina, D., Zuber, K., and Zuzel, G.

Published
2016
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25. Limit on Neutrinoless Double Beta Decay of 76Ge by GERDA

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A.M., Balata, M., Barabanov, I., Heider, M. Barabè, Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S.T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E.V., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K.K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L.V., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I.V., Kirsch, A., Klimenko, A., Knöpfle, K.T., Kochetov, O., Kornoukhov, V.N., Kuzminov, V.V., Laubenstein, M., Lazzaro, A., Lebedev, V.I., Lehnert, B., Liao, H.Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Machado, A.A., Macolino, C., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., Shaughnessy, C.O’., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C.A., Vasenko, A.A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S.V., Zinatulina, D., Zuber, K., and Zuzel, G.

Published
2015
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26. Production, characterization and operation of 76 Ge enriched BEGe detectors in GERDA: GERDA Collaboration

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., D’Andrea, V., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Janicskó Csáthy, J., Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O’Shaughnessy, C., Palioselitis, D., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schütz, A. -K., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Ur, C. A., Vanhoefer, L., Vasenko, A. A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Published
2015
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27. The background in the 0 ν β β experiment Gerda

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Barnabé Heider, M., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A. A., Majorovits, B., Maneschg, W., Nemchenok, I., Nisi, S., O’Shaughnessy, C., Palioselitis, D., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C. A., Vasenko, A. A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Published
2014
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29. Flux modulations seen by the muon veto of the GERDA experiment

Author

collaboration, G, Agostini, M, Balata, M, D'Andrea, V, di Vacri, A, Ioannucci, L, Junker, M, Laubenstein, M, Macolino, C, Pandola, L, Borowicz, D, Frodyma, N, Misiaszek, M, Panas, K, Pelczar, K, Wojcik, M, Zuzel, G, Allardt, M, Barros, N, Domula, A, Lehnert, B, Schneider, B, Wester, T, Wilsenach, H, Zuber, K, Brudanin, V, Egorov, V, Gusev, K, Klimenko, A, Kochetov, O, Lubashevskiy, A, Nemchenok, I, Rumyantseva, N, Shevchik, E, Shirchenko, M, Zhitnikov, I, Zinatulina, D, Hult, M, Lutter, G, Bauer, C, Gangapshev, A, Heisel, M, Hofmann, W, Kihm, T, Kirsch, A, Knöpfle, KT, Lindner, M, Maneschg, W, Salathe, M, Schreiner, J, Schwingenheuer, B, Simgen, H, Smolnikov, A, Stepaniuk, M, Strecker, H, Wagner, V, Wegmann, A, Bellotti, E, Cattadori, C, Pullia, A, Riboldi, S, Barabanov, I, Belogurov, S, Bezrukov, L, Doroshkevich, E, Fedorova, O, Gurentsov, V, Inzhechik, LV, Kazalov, V, Kornoukhov, VN, Kuzminov, VV, Lubsandorzhiev, B, Moseev, P, Selivanenko, O, Veresnikova, A, Yanovich, E, Chernogorov, A, Demidova, EV, Kirpichnikov, IV, Vasenko, AA, Bakalyarov, AM, Belyaev, ST, Lebedev, VI, Zhukov, SV, Becerici-Schmidt, N, Caldwell, A, Liao, HY, Majorovits, B, Palioselitis, D, and Schulz, O

Abstract

© 2016 Elsevier B.V. The GERDA experiment at LNGS of INFN is equipped with an active muon veto. The main part of the system is a water Cherenkov veto with 66 PMTs in the water tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows a seasonal modulation. Two causes have been identified: (i) secondary muons from the CNGS neutrino beam (2.2%) and (ii) a temperature modulation of the atmosphere (1.4%). A mean cosmic muon rate of Iμ0=(3.477±0.002stat±0.067sys)×10−4/(s · m2) was found in good agreement with other experiments at LNGS. Combining the present result with those from previous experiments at LNGS the effective temperature coefficient αT,Lngsis determined to 0.93 ± 0.03. A fit of the temperature coefficients measured at various underground sites yields a kaon to pion ratio rK/πof 0.10 ± 0.03.

Published
2016

30. The background in the 0νββ experiment Gerda

Author

Agostini, M.Physik Department and Excellence Cluster Universe, Technische Universität München, München, Germany, Allardt, M.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Andreotti, E.(Institute for Reference Materials and Measurements, Geel, Belgium), Bakalyarov, A. M.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Balata, M.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), Barabanov, I.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Barnabé Heider, M.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Barros, N.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Baudis, L.(Physik Institut der Universität Zürich, Zurich, Switzerland), Bauer, C.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Becerici-Schmidt, N.(Max-Planck-Institut für Physik, München, Germany), Bellotti, E.(Dipartimento di Fisica, Università Milano Bicocca, Milan, Italy), Belogurov, S.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Belyaev, S. T.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Benato, G.(Physik Institut der Universität Zürich, Zurich, Switzerland), Bettini, A.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Bezrukov, L.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Bode, T.(Physik Department and Excellence Cluster Universe, Technische Universität München, München, Germany), Brudanin, V.(Joint Institute for Nuclear Research, Dubna, Russia), Brugnera, R.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Budjáš, D.(Physik Department and Excellence Cluster Universe, Technische Universität München, München, Germany), Caldwell, A.(Max-Planck-Institut für Physik, München, Germany), Cattadori, C.(INFN Milano Bicocca, Milan, Italy), Chernogorov, A.(Institute for Theoretical and Experimental Physics, Moscow, Russia), Cossavella, F.(Max-Planck-Institut für Physik, München, Germany), Demidova, E. V.(Institute for Theoretical and Experimental Physics, Moscow, Russia), Domula, A.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Egorov, V.(Joint Institute for Nuclear Research, Dubna, Russia), Falkenstein, R.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Ferella, A.(Physik Institut der Universität Zürich, Zurich, Switzerland), Freund, K.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Frodyma, N.(Institute of Physics, Jagiellonian University, Cracow, Poland), Gangapshev, A.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Garfagnini, A.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Gotti, C.(INFN Milano Bicocca, Milan, Italy), Grabmayr, P.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Gurentsov, V.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Gusev, K.(Joint Institute for Nuclear Research, Dubna, Russia), Guthikonda, K. K.(Physik Institut der Universität Zürich, Zurich, Switzerland), Hampel, W.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Hegai, A.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Heisel, M.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Hemmer, S.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Heusser, G.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Hofmann, W.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Hult, M.(Institute for Reference Materials and Measurements, Geel, Belgium), Inzhechik, L. V.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Ioannucci, L.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), Csáthy, J. Janicskó(Physik Department and Excellence Cluster Universe, Technische Universität München, München, Germany), Jochum, J.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Junker, M.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), Kihm, T.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Kirpichnikov, I. V.(Institute for Theoretical and Experimental Physics, Moscow, Russia), Kirsch, A.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Klimenko, A.(Joint Institute for Nuclear Research, Dubna, Russia), Knöpfle, K. T.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Kochetov, O.(Joint Institute for Nuclear Research, Dubna, Russia), Kornoukhov, V. N.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Kuzminov, V. V.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Laubenstein, M.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), Lazzaro, A.(Physik Department and Excellence Cluster Universe, Technische Universität München, München, Germany), Lebedev, V. I.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Lehnert, B.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Liao, H. Y.(Max-Planck-Institut für Physik, München, Germany), Lindner, M.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Lippi, I.(INFN Padova, Padua, Italy), Liu, X.(Max-Planck-Institut für Physik, München, Germany), Lubashevskiy, A.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Lubsandorzhiev, B.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Lutter, G.(Institute for Reference Materials and Measurements, Geel, Belgium), Macolino, C.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), Machado, A. A.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Majorovits, B.(Max-Planck-Institut für Physik, München, Germany), Maneschg, W.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Nemchenok, I.(Joint Institute for Nuclear Research, Dubna, Russia), Nisi, S.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), O’Shaughnessy, C.(Max-Planck-Institut für Physik, München, Germany), Palioselitis, D.(Max-Planck-Institut für Physik, München, Germany), Pandola, L.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), Pelczar, K.(Institute of Physics, Jagiellonian University, Cracow, Poland), Pessina, G.(Dipartimento di Fisica, Università Milano Bicocca, Milan, Italy), Pullia, A.(Dipartimento di Fisica, Università degli Studi di Milano e INFN Milano, Milan, Italy), Riboldi, S.(Dipartimento di Fisica, Università degli Studi di Milano e INFN Milano, Milan, Italy), Sada, C.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Salathe, M.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Schmitt, C.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Schreiner, J.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Schulz, O.(Max-Planck-Institut für Physik, München, Germany), Schwingenheuer, B.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Schönert, S.(Physik Department and Excellence Cluster Universe, Technische Universität München, München, Germany), Shevchik, E.(Joint Institute for Nuclear Research, Dubna, Russia), Shirchenko, M.(Joint Institute for Nuclear Research, Dubna, Russia), Simgen, H.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Smolnikov, A.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Stanco, L.(INFN Padova, Padua, Italy), Strecker, H.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Tarka, M.(Physik Institut der Universität Zürich, Zurich, Switzerland), Ur, C. A.(INFN Padova, Padua, Italy), Vasenko, A. A.(Institute for Theoretical and Experimental Physics, Moscow, Russia), Volynets, O.(Max-Planck-Institut für Physik, München, Germany), von Sturm, K.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Wagner, V.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Walter, M.(Physik Institut der Universität Zürich, Zurich, Switzerland), Wegmann, A.(Max Planck Institut für Kernphysik, Heidelberg, Germany), Wester, T.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Wojcik, M.(Institute of Physics, Jagiellonian University, Cracow, Poland), Yanovich, E.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Zavarise, P.(INFN Laboratori Nazionali del Gran Sasso, LNGS, Assergi, Italy), Zhitnikov, I.(Joint Institute for Nuclear Research, Dubna, Russia), Zhukov, S. V.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Zinatulina, D.(Joint Institute for Nuclear Research, Dubna, Russia), Zuber, K.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Zuzel, G.(Institute of Physics, Jagiellonian University, Cracow, Poland), Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, A, Balata, M, Barabanov, I, Barnabé Heider, M, Barros, N, Baudis, L, Bauer, C, Becerici Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, S, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, Cossavella, F, Demidova, E, Domula, A, Egorov, V, Falkenstein, R, Ferella, A, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Guthikonda, K, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, L, Ioannucci, L, Csáthy, J, Jochum, J, Junker, M, Kihm, T, Kirpichnikov, I, Kirsch, A, Klimenko, A, Knöpfle, K, Kochetov, O, Kornoukhov, V, Kuzminov, V, Laubenstein, M, Lazzaro, A, Lebedev, V, Lehnert, B, Liao, H, Lindner, M, Lippi, I, Liu, X, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Machado, A, Majorovits, B, Maneschg, W, Nemchenok, I, Nisi, S, O'Shaughnessy, C, Palioselitis, D, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, Sada, C, Salathe, M, Schmitt, C, Schreiner, J, Schulz, O, Schwingenheuer, B, Schönert, S, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Strecker, H, Tarka, M, Ur, C, Vasenko, A, Volynets, O, von Sturm, K, Wagner, V, Walter, M, Wegmann, A, Wester, T, Wojcik, M, Yanovich, E, Zavarise, P, Zhitnikov, I, Zhukov, S, Zinatulina, D, Zuber, K, and Zuzel, G

Subjects
Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Abstract

The GERmanium Detector Array ( Gerda ) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta ( 0νββ ) decay of 76 Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Qββ value of the decay. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around Qββ . The main parameters needed for the 0νββ analysis are described. A background model was developed to describe the observed energy spectrum. The model contains several contributions, that are expected on the basis of material screening or that are established by the observation of characteristic structures in the energy spectrum. The model predicts a flat energy spectrum for the blinding window around Qββ with a background index ranging from 17.6 to 23.8 ×  10-3  cts/(keV kg yr). A part of the data not considered before has been used to test if the predictions of the background model are consistent. The observed number of events in this energy region is consistent with the background model. The background at Qββ is dominated by close sources, mainly due to 42 K, 214 Bi, 228 Th, 60 Co and α emitting isotopes from the 226 Ra decay chain. The individual fractions depend on the assumed locations of the contaminants. It is shown, that after removal of the known γ peaks, the energy spectrum can be fitted in an energy range of 200 keV around Qββ with a constant background. This gives a background index consistent with the full model and uncertainties of the same size.

Published
2014

31. Limits on uranium and thorium bulk content in Gerda Phase I detectors

Author

collaboration, GERDA, primary, Agostini, M., additional, Allardt, M., additional, Bakalyarov, A.M., additional, Balata, M., additional, Barabanov, I., additional, Baudis, L., additional, Bauer, C., additional, Becerici-Schmidt, N., additional, Bellotti, E., additional, Belogurov, S., additional, Belyaev, S.T., additional, Benato, G., additional, Bettini, A., additional, Bezrukov, L., additional, Bode, T., additional, Borowicz, D., additional, Brudanin, V., additional, Brugnera, R., additional, Caldwell, A., additional, Cattadori, C., additional, Chernogorov, A., additional, D’Andrea, V., additional, Demidova, E.V., additional, di Vacri, A., additional, Domula, A., additional, Doroshkevich, E., additional, Egorov, V., additional, Falkenstein, R., additional, Fedorova, O., additional, Freund, K., additional, Frodyma, N., additional, Gangapshev, A., additional, Garfagnini, A., additional, Grabmayr, P., additional, Gurentsov, V., additional, Gusev, K., additional, Hakemüller, J., additional, Hegai, A., additional, Heisel, M., additional, Hemmer, S., additional, Hofmann, W., additional, Hult, M., additional, Inzhechik, L.V., additional, Janicskó Csáthy, J., additional, Jochum, J., additional, Junker, M., additional, Kazalov, V., additional, Kihm, T., additional, Kirpichnikov, I.V., additional, Kirsch, A., additional, Kish, A., additional, Klimenko, A., additional, Kneißl, R., additional, Knöpfle, K.T., additional, Kochetov, O., additional, Kornoukhov, V.N., additional, Kuzminov, V.V., additional, Laubenstein, M., additional, Lazzaro, A., additional, Lebedev, V.I., additional, Lehnert, B., additional, Liao, H.Y., additional, Lindner, M., additional, Lippi, I., additional, Lubashevskiy, A., additional, Lubsandorzhiev, B., additional, Lutter, G., additional, Macolino, C., additional, Majorovits, B., additional, Maneschg, W., additional, Medinaceli, E., additional, Mingazheva, R., additional, Misiaszek, M., additional, Moseev, P., additional, Nemchenok, I., additional, Palioselitis, D., additional, Panas, K., additional, Pandola, L., additional, Pelczar, K., additional, Pullia, A., additional, Riboldi, S., additional, Rumyantseva, N., additional, Sada, C., additional, Salamida, F., additional, Salathe, M., additional, Schmitt, C., additional, Schneider, B., additional, Schönert, S., additional, Schreiner, J., additional, Schütz, A.-K., additional, Schulz, O., additional, Schwingenheuer, B., additional, Selivanenko, O., additional, Shevchik, E., additional, Shirchenko, M., additional, Simgen, H., additional, Smolnikov, A., additional, Stanco, L., additional, Stepaniuk, M., additional, Vanhoefer, L., additional, Vasenko, A.A., additional, Veresnikova, A., additional, von Sturm, K., additional, Wagner, V., additional, Walter, M., additional, Wegmann, A., additional, Wester, T., additional, Wiesinger, C., additional, Wojcik, M., additional, Yanovich, E., additional, Zhitnikov, I., additional, Zhukov, S.V., additional, Zinatulina, D., additional, Zuber, K., additional, and Zuzel, G., additional

Published
2017
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32. Results on neutrinoless double-β decay of 76Ge from phase I of the GERDA experiment

Author

Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, A, Balata, M, Barabanov, I, Barnabé Heider, M, Barros, N, Baudis, L, Bauer, C, Becerici Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, S, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, Cossavella, F, Demidova, E, Domula, A, Egorov, V, Falkenstein, R, Ferella, A, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Grabmayr, P, Gurentsov, V, Gusev, K, Guthikonda, K, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, L, Ioannucci, L, Janicskó Csáthy, J, Jochum, J, Junker, M, Kihm, T, Kirpichnikov, I, Kirsch, A, Klimenko, A, Knöpfle, K, Kochetov, O, Kornoukhov, V, Kuzminov, V, Laubenstein, M, Lazzaro, A, Lebedev, V, Lehnert, B, Liao, H, Lindner, M, Lippi, I, Liu, X, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Machado, A, Majorovits, B, Maneschg, W, Misiaszek, M, Nemchenok, I, Nisi, S, O'Shaughnessy, C, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schreiner, J, Schulz, O, Schwingenheuer, B, Schönert, S, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Strecker, H, Tarka, M, Ur, C, Vasenko, A, Volynets, O, Von Sturm, K, Wagner, V, Walter, M, Wegmann, A, Wester, T, Wojcik, M, Yanovich, E, Zavarise, P, Zhitnikov, I, Zhukov, S, Zinatulina, D, Zuber, K, Zuzel, G., GOTTI, CLAUDIO, Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, A, Balata, M, Barabanov, I, Barnabé Heider, M, Barros, N, Baudis, L, Bauer, C, Becerici Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, S, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, Cossavella, F, Demidova, E, Domula, A, Egorov, V, Falkenstein, R, Ferella, A, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Guthikonda, K, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, L, Ioannucci, L, Janicskó Csáthy, J, Jochum, J, Junker, M, Kihm, T, Kirpichnikov, I, Kirsch, A, Klimenko, A, Knöpfle, K, Kochetov, O, Kornoukhov, V, Kuzminov, V, Laubenstein, M, Lazzaro, A, Lebedev, V, Lehnert, B, Liao, H, Lindner, M, Lippi, I, Liu, X, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Machado, A, Majorovits, B, Maneschg, W, Misiaszek, M, Nemchenok, I, Nisi, S, O'Shaughnessy, C, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schreiner, J, Schulz, O, Schwingenheuer, B, Schönert, S, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Strecker, H, Tarka, M, Ur, C, Vasenko, A, Volynets, O, Von Sturm, K, Wagner, V, Walter, M, Wegmann, A, Wester, T, Wojcik, M, Yanovich, E, Zavarise, P, Zhitnikov, I, Zhukov, S, Zinatulina, D, Zuber, K, and Zuzel, G

Subjects
Physics and Astronomy (all)
Abstract

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope Ge76. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about 1×10-2 counts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of Ge76, T1/20ν>2.1×1025 yr (90% C.L.). The combination with the results from the previous experiments with Ge76 yields T1/20ν>3.0×1025 yr (90% C.L.). © 2013 American Physical Society.

Published
2013

33. Results on ββ decay with emission of two neutrinos or Majorons in 76 Ge from GERDA Phase I

Author

LNGS, Assergi, Italy, Agostini, M.(Physik Department and Excellence Cluster Universe, Technische Universität München, Munich, Germany), Allardt, M.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Bakalyarov, A. M.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Balata, M.(INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy), Barabanov, I.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Barros, N.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Baudis, L.(Physik Institut der Universität Zürich, Zurich, Switzerland), Bauer, C.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Becerici-Schmidt, N.(Max-Planck-Institut für Physik, Munich, Germany), Bellotti, E.(Dipartimento di Fisica, Università Milano Bicocca, Milan, Italy), Belogurov, S.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Belyaev, S. T.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Benato, G.(Physik Institut der Universität Zürich, Zurich, Switzerland), Bettini, A.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Bezrukov, L.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Bode, T.(Physik Department and Excellence Cluster Universe, Technische Universität München, Munich, Germany), Borowicz, D.(Institute of Physics, Jagiellonian University, Cracow, Poland), Brudanin, V.(Joint Institute for Nuclear Research, Dubna, Russia), Brugnera, R.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Budjáš, D.(Physik Department and Excellence Cluster Universe, Technische Universität München, Munich, Germany), Caldwell, A.(Max-Planck-Institut für Physik, Munich, Germany), Cattadori, C.(INFN Milano Bicocca, Milan, Italy), Chernogorov, A.(Institute for Theoretical and Experimental Physics, Moscow, Russia), D’Andrea, V.(INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy), Demidova, E. V.(Institute for Theoretical and Experimental Physics, Moscow, Russia), di Vacri, A.(INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy), Domula, A.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Doroshkevich, E.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Egorov, V.(Joint Institute for Nuclear Research, Dubna, Russia), Falkenstein, R.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Fedorova, O.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Freund, K.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Frodyma, N.(Institute of Physics, Jagiellonian University, Cracow, Poland), Gangapshev, A.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Garfagnini, A.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Grabmayr, P.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Gurentsov, V.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Gusev, K.(Joint Institute for Nuclear Research, Dubna, Russia), Hegai, A.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Heisel, M.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Hemmer, S.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Heusser, G.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Hofmann, W.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Hult, M.(Institute for Reference Materials and Measurements, Geel, Belgium), Inzhechik, L. V.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Csáthy, J. Janicskó(Physik Department and Excellence Cluster Universe, Technische Universität München, Munich, Germany), Jochum, J.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Junker, M.(INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy), Kazalov, V.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Kihm, T.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Kirpichnikov, I. V.(Institute for Theoretical and Experimental Physics, Moscow, Russia), Kirsch, A.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Klimenko, A.(Joint Institute for Nuclear Research, Dubna, Russia), Knöpfle, K. T.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Kochetov, O.(Joint Institute for Nuclear Research, Dubna, Russia), Kornoukhov, V. N.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Kuzminov, V. V.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Laubenstein, M.(INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy), Lazzaro, A.(Physik Department and Excellence Cluster Universe, Technische Universität München, Munich, Germany), Lebedev, V. I.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Lehnert, B.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Liao, H. Y.(Max-Planck-Institut für Physik, Munich, Germany), Lindner, M.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Lippi, I.(INFN Padova, Padua, Italy), Lubashevskiy, A.(Joint Institute for Nuclear Research, Dubna, Russia), Lubsandorzhiev, B.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Lutter, G.(Institute for Reference Materials and Measurements, Geel, Belgium), Macolino, C.(INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy), Majorovits, B.(Max-Planck-Institut für Physik, Munich, Germany), Maneschg, W.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Medinaceli, E.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Misiaszek, M.(Institute of Physics, Jagiellonian University, Cracow, Poland), Moseev, P.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Nemchenok, I.(Joint Institute for Nuclear Research, Dubna, Russia), Palioselitis, D.(Max-Planck-Institut für Physik, Munich, Germany), Panas, K.(Institute of Physics, Jagiellonian University, Cracow, Poland), Pandola, L.(INFN Laboratori Nazionali del Sud, Catania, Italy), Pelczar, K.(Institute of Physics, Jagiellonian University, Cracow, Poland), Pullia, A.(Dipartimento di Fisica, Università degli Studi di Milano e INFN Milano, Milan, Italy), Riboldi, S.(Dipartimento di Fisica, Università degli Studi di Milano e INFN Milano, Milan, Italy), Rumyantseva, N.(Joint Institute for Nuclear Research, Dubna, Russia), Sada, C.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Salathe, M.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Schmitt, C.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Schneider, B.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Schönert, S.(Physik Department and Excellence Cluster Universe, Technische Universität München, Munich, Germany), Schreiner, J.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Schütz, A.-K.(Physikalisches Institut, Eberhard Karls Universität Tübingen, Tübingen, Germany), Schulz, O.(Max-Planck-Institut für Physik, Munich, Germany), Schwingenheuer, B.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Selivanenko, O.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Shirchenko, M.(Joint Institute for Nuclear Research, Dubna, Russia), Simgen, H.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Smolnikov, A.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Stanco, L.(INFN Padova, Padua, Italy), Stepaniuk, M.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Ur, C. A.(INFN Padova, Padua, Italy), Vanhoefer, L.(Max-Planck-Institut für Physik, Munich, Germany), Vasenko, A. A.(Institute for Theoretical and Experimental Physics, Moscow, Russia), Veresnikova, A.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), von Sturm, K.(Dipartimento di Fisica e Astronomia dell‘Università di Padova, Padua, Italy), Wagner, V.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Walter, M.(Physik Institut der Universität Zürich, Zurich, Switzerland), Wegmann, A.(Max-Planck-Institut für Kernphysik, Heidelberg, Germany), Wester, T.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Wilsenach, H.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), Wojcik, M.(Institute of Physics, Jagiellonian University, Cracow, Poland), Yanovich, E.(Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia), Zavarise, P.(INFN Laboratori Nazionali del Gran Sasso and Gran Sasso Science Institute, Assergi, Italy), Zhitnikov, I.(Joint Institute for Nuclear Research, Dubna, Russia), Zhukov, S. V.(National Research Centre 'Kurchatov Institute', Moscow, Russia), Zinatulina, D.(Joint Institute for Nuclear Research, Dubna, Russia), Zuber, K.(Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany), and Zuzel, G.(Institute of Physics, Jagiellonian University, Cracow, Poland)

Abstract

A search for neutrinoless ββ 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 ββ decay of 76 Ge with significantly reduced uncertainties is also given, resulting in T1/22ν=(1.926±0.094)×1021 yr.

Published
2015

34. Results on ββ decay with emission of two neutrinos or Majorons in 76 Ge from GERDA Phase I

Author

Agostini, M., Allardt, M., Bakalyarov, A.M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S.T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., D’Andrea, V., Demidova, E.V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L.V., Csáthy, J. Janicskó, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I.V., Kirsch, A., Klimenko, A., Knöpfle, K.T., Kochetov, O., Kornoukhov, V.N., Kuzminov, V.V., Laubenstein, M., Lazzaro, A., Lebedev, V.I., Lehnert, B., Liao, H.Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Medinaceli, E., Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schneider, B., Schönert, S., Schreiner, J., Schütz, A.K., Schulz, O., Schwingenheuer, B., Selivanenko, O., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., Ur, C.A., Vanhoefer, L., Vasenko, A.A., Veresnikova, A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S.V., Zinatulina, D., Zuber, K., and Zuzel, G.

Abstract

A search for neutrinoless ββ 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 ββ decay of 76 Ge with significantly reduced uncertainties is also given, resulting in T1/22ν=(1.926±0.094)×1021  yr.

Published
2015

35. Results on ββ decay with emission of two neutrinos or Majorons in 76Ge from GERDA Phase I

Author

GERDA Collaboration, Agostini, M, Allardt, M, Bakalyarov, AM, Balata, M, Barabanov, I, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, di Vacri, A, Domula, A, Doroshkevich, E, Egorov, V, Falkenstein, R, Fedorova, O, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Grabmayr, P, Gurentsov, V, Gusev, K, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Csáthy, J Janicskó, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Medinaceli, E, Misiaszek, M, Moseev, P, Nemchenok, I, Palioselitis, D, Panas, K, Pandola, L, Pelczar, K, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schneider, B, Schönert, S, Schreiner, J, Schütz, A-K, Schulz, O, Schwingenheuer, B, Selivanenko, O, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Stepaniuk, M, Ur, CA, Vanhoefer, L, and Vasenko, AA

Subjects
Quantum Physics, Particle and Plasma Physics, Molecular, Nuclear, nucl-ex, physics.ins-det, Atomic, Nuclear & Particles Physics
Abstract

A search for neutrinoless ββ decay processes accompanied with Majoron emission has been performed using data collected during PhaseI 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 1023yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with 76Ge. A new result for the half-life of the neutrino-accompanied ββ decay of 76Ge with significantly reduced uncertainties is also given, resulting in (Formula presented.) yr.

Published
2015

36. Production, characterization and operation of76Ge enriched BEGe detectors in GERDA: GERDA Collaboration

Author

Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, AM, Balata, M, Barabanov, I, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, Domula, A, Egorov, V, Falkenstein, R, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Janicskó Csáthy, J, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Misiaszek, M, Nemchenok, I, Nisi, S, O’Shaughnessy, C, Palioselitis, D, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, and Rumyantseva, N

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Experiment, Nuclear Experiment
Abstract

© 2015, The Author(s). The GERmanium Detector Array (Gerda) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0νββ) of76Ge. Germanium detectors made of material with an enriched76Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of theexperiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new76Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in Gerda during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the76Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of Gerda Phase II.

Published
2015

37. Results on beta beta decay with emission of two neutrinos or Majorons in Ge-76 from GERDA Phase I

Author

Agostini, M., Allardt, M., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, Riccardo, Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, Alberto, Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, SABINE ELISABETH, Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Csathy, J. Janicsko, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knoepfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., MEDINACELI VILLEGAS, Eduardo, Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, Cinzia, Salathe, M., Schmitt, C., Schneider, B., Schoenert, S., Schreiner, J., Schuetz, A. K., Schulz, O., Schwingenheuer, B., Selivanenko, O., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., C. A., Ur, Vanhoefer, L., Vasenko, A. A., Veresnikova, A., VON STURM ZU VEHLINGEN, KATHARINA CACILIE, Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
PHYSICS, LIMITS, ZR-96, SE-82, MO-100, MODES, MASS, GEANT4, TABLES
Published
2015

38. Production, characterization and operation of ^{76}Ge enriched BEGe detectors in GERDA

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjas, D., Caldwel, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csathy, J. Janicsko, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Palioselitis, D., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Ur, C. A., Vanhoefer, L., Vasenko, A. A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., Zuzel, G., and GERDA Collaboration

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, High Energy Physics::Experiment, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment, GERDA - Abteilung Hofmann
Abstract

The GERmanium Detector Array (GERDA) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0{\nu}{\beta}{\beta}) of $^{76}$Ge. Germanium detectors made of material with an enriched $^{76}$Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of the experiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new $^{76}$Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in GERDA during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the $^{76}$Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of GERDA Phase~II., Comment: 23 pages, 21 figures

Published
2015

39. Production, characterization and operation of 76Ge enriched BEGe detectors in GERDA: GERDA Collaboration

Author

Agostini, M, Allardt, M, Andreotti, E, Bakalyarov, AM, Balata, M, Barabanov, I, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Borowicz, D, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, D’Andrea, V, Demidova, EV, Domula, A, Egorov, V, Falkenstein, R, Freund, K, Frodyma, N, Gangapshev, A, Garfagnini, A, Gotti, C, Grabmayr, P, Gurentsov, V, Gusev, K, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Janicskó Csáthy, J, Jochum, J, Junker, M, Kazalov, V, Kihm, T, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kuzminov, VV, Laubenstein, M, Lazzaro, A, Lebedev, VI, Lehnert, B, Liao, HY, Lindner, M, Lippi, I, Lubashevskiy, A, Lubsandorzhiev, B, Lutter, G, Macolino, C, Majorovits, B, Maneschg, W, Misiaszek, M, Nemchenok, I, Nisi, S, O’Shaughnessy, C, Palioselitis, D, Pandola, L, Pelczar, K, Pessina, G, Pullia, A, Riboldi, S, Rumyantseva, N, Sada, C, Salathe, M, Schmitt, C, Schreiner, J, Schulz, O, Schütz, AK, Schwingenheuer, B, Schönert, S, Shevchik, E, Shirchenko, M, Simgen, H, Smolnikov, A, Stanco, L, Strecker, H, Ur, CA, Vanhoefer, L, Vasenko, AA, von Sturm, K, and Wagner, V

Subjects
Quantum Physics, Particle and Plasma Physics, Physics::Instrumentation and Detectors, hep-ex, Molecular, High Energy Physics::Experiment, Nuclear, Nuclear Experiment, nucl-ex, physics.ins-det, Nuclear & Particles Physics, Atomic
Abstract

The GERmanium Detector Array (Gerda) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0νββ) of 76Ge. Germanium detectors made of material with an enriched 76Ge fraction act simultaneously as sources and detectors for this decay. During PhaseI of theexperiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming PhaseII, 30 new 76Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in Gerda during PhaseI. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the 76Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of Gerda PhaseII.

Published
2015

40. 2 nu beta beta decay of Ge-76 into excited states with GERDA phase I

Author

Agostini, M., Allardt, M., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., di Vacri, A., Domula, A., Doroshkevich, E., Egorov, V., Falkenstein, R., Fedorova, O., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gooch, C., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Csathy, J. Janicsko, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knoepfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Medinaceli, E., Mi, Y., Misiaszek, M., Moseev, P., Nemchenok, I., Palioselitis, D., Panas, K., Pandola, L., Pelczar, K., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schneider, B., Schreiner, J., Schulz, O., Schwingenheuer, B., Schoenert, S., Schuetz, A-K, Selivanenko, O., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Stepaniuk, M., C. A., Ur, Vanhoefer, L., Vasenko, A. A., Veresnikova, A., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
germanium, NUCLEI, DOUBLE-BETA-DECAY, double beta decay, excited states
Published
2015

41. Production, characterization and operation of Ge-76 enriched BEGe detectors in GERDA

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Borowicz, D., Brudanin, V., Brugnera, R., Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., D'Andrea, V., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csathy, J. Janicsko, Jochum, J., Junker, M., Kazalov, V., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knoepfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Palioselitis, D., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schuetz, A. -K., Schwingenheuer, B., Schoenert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., C. A., Ur, Vanhoefer, L., Vasenko, A. A., Von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wilsenach, H., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
COSMOGENIC ACTIVATION, DECAY, GERMANIUM
Published
2015

42. The background in the neutrinoless double beta decay experiment GERDA

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A., Balata, M., Barabanov, I., Barnabe Heider, M., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L., Ioannucci, L., Csathy, J., Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I., Kirsch, A., Klimenko, A., Knoepfle, K., Kochetov, O., Kornoukhov, V., Kuzminov, V., Laubenstein, M., Lazzaro, A., Lebedev, V., Lehnert, B., Liao, H., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A., Majorovits, B., Maneschg, W., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Palioselitis, D., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schoenert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C., Vasenko, A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S., Zinatulina, D., Zuber, K., Zuzel, G., and GERDA collaboration

Subjects
GERDA - Abteilung Hofmann
Abstract

The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta decay of 76Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Q-value of the decay, Q_bb. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around Q_bb. The main parameters needed for the neutrinoless double beta decay analysis are described. A background model was developed to describe the observed energy spectrum. The model contains several contributions, that are expected on the basis of material screening or that are established by the observation of characteristic structures in the energy spectrum. The model predicts a flat energy spectrum for the blinding window around Q_bb with a background index ranging from 17.6 to 23.8*10^{-3} counts/(keV kg yr). A part of the data not considered before has been used to test if the predictions of the background model are consistent. The observed number of events in this energy region is consistent with the background model. The background at Q-bb is dominated by close sources, mainly due to 42K, 214Bi, 228Th, 60Co and alpha emitting isotopes from the 226Ra decay chain. The individual fractions depend on the assumed locations of the contaminants. It is shown, that after removal of the known gamma peaks, the energy spectrum can be fitted in an energy range of 200 kev around Q_bb with a constant background. This gives a background index consistent with the full model and uncertainties of the same size.

Published
2014

43. Flux modulations seen by the muon veto of the Gerda experiment

Author

collaboration, GERDA, primary, Agostini, M., additional, Allardt, M., additional, Bakalyarov, A.M., additional, Balata, M., additional, Barabanov, I., additional, Barros, N., additional, Baudis, L., additional, Bauer, C., additional, Becerici-Schmidt, N., additional, Bellotti, E., additional, Belogurov, S., additional, Belyaev, S.T., additional, Benato, G., additional, Bettini, A., additional, Bezrukov, L., additional, Bode, T., additional, Borowicz, D., additional, Brudanin, V., additional, Brugnera, R., additional, Caldwell, A., additional, Cattadori, C., additional, Chernogorov, A., additional, D’Andrea, V., additional, Demidova, E.V., additional, di Vacri, A., additional, Domula, A., additional, Doroshkevich, E., additional, Egorov, V., additional, Falkenstein, R., additional, Fedorova, O., additional, Freund, K., additional, Frodyma, N., additional, Gangapshev, A., additional, Garfagnini, A., additional, Grabmayr, P., additional, Gurentsov, V., additional, Gusev, K., additional, Hegai, A., additional, Heisel, M., additional, Hemmer, S., additional, Hofmann, W., additional, Hult, M., additional, Inzhechik, L.V., additional, Ioannucci, L., additional, Janicsk’o Cs’athy, J., additional, Jochum, J., additional, Junker, M., additional, Kazalov, V., additional, Kihm, T., additional, Kirpichnikov, I.V., additional, Kirsch, A., additional, Klimenko, A., additional, Knapp, M., additional, Knöpfle, K.T., additional, Kochetov, O., additional, Kornoukhov, V.N., additional, Kuzminov, V.V., additional, Laubenstein, M., additional, Lazzaro, A., additional, Lebedev, V.I., additional, Lehnert, B., additional, Liao, H.Y., additional, Lindner, M., additional, Lippi, I., additional, Lubashevskiy, A., additional, Lubsandorzhiev, B., additional, Lutter, G., additional, Macolino, C., additional, Majorovits, B., additional, Maneschg, W., additional, Medinaceli, E., additional, Misiaszek, M., additional, Moseev, P., additional, Nemchenok, I., additional, Palioselitis, D., additional, Panas, K., additional, Pandola, L., additional, Pelczar, K., additional, Pullia, A., additional, Riboldi, S., additional, Ritter, F., additional, Rumyantseva, N., additional, Sada, C., additional, Salathe, M., additional, Schmitt, C., additional, Schneider, B., additional, Schönert, S., additional, Schreiner, J., additional, Schütz, A.-K., additional, Schulz, O., additional, Schwingenheuer, B., additional, Selivanenko, O., additional, Shevchik, E., additional, Shirchenko, M., additional, Simgen, H., additional, Smolnikov, A., additional, Stanco, L., additional, Stepaniuk, M., additional, Strecker, H., additional, Vanhoefer, L., additional, Vasenko, A.A., additional, Veresnikova, A., additional, von Sturm, K., additional, Wagner, V., additional, Walter, M., additional, Wegmann, A., additional, Wester, T., additional, Wiesinger, C., additional, Wilsenach, H., additional, Wojcik, M., additional, Yanovich, E., additional, Zhitnikov, I., additional, Zhukov, S.V., additional, Zinatulina, D., additional, Zuber, K., additional, and Zuzel, G., additional

Published
2016
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44. Results on neutrinoless double-β decay of 76Ge from Phase I of the GERDA Experiment

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A., Balata, M., Barabanov, I., Heider Barnabé, M., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L., Ioannucci, L., Csáthy, J., Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I., Kirsch, A., Klimenko, A., Knoepfle, K., Kochetov, O., Kornoukhov, V., Kuzminov, V., Laubenstein, M., Lazzaro, A., Lebedev, V., Lehnert, B., Liao, H., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Pandola, L., Pelczar, K., Pessina, G., Potenza, %., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe , M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C., Vasenko, A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S., Zinatulina, D., Zuber, K., and Zuzel, G.

Subjects
GERDA - Abteilung Hofmann
Abstract

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the Standard Model of particle physics. This Letter reports the results from Phase I of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope 76Ge. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kgyr. A blind analysis is performed. The background index is about 1.10^{-2} cts/(keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of 76Ge, T_1/2 > 2.1 10^{25} yr (90% C.L.). The combination with the results from the previous experiments with 76Ge yields T_1/2 > 3.0 10^{25} yr (90% C.L.).

Published
2013

45. The Gerda experiment for the search of 0νββ decay in76Ge

Author

Ackermann, KH, Agostini, M, Allardt, M, Altmann, M, Andreotti, E, Bakalyarov, AM, Balata, M, Barabanov, I, Barnabé Heider, M, Barros, N, Baudis, L, Bauer, C, Becerici-Schmidt, N, Bellotti, E, Belogurov, S, Belyaev, ST, Benato, G, Bettini, A, Bezrukov, L, Bode, T, Brudanin, V, Brugnera, R, Budjáš, D, Caldwell, A, Cattadori, C, Chernogorov, A, Chkvorets, O, Cossavella, F, D'Andragora, A, Demidova, EV, Denisov, A, di Vacri, A, Domula, A, Egorov, V, Falkenstein, R, Ferella, A, Freund, K, Froborg, F, Frodyma, N, Gangapshev, A, Garfagnini, A, Gasparro, J, Gazzana, S, Gonzalez de Orduna, R, Grabmayr, P, Gurentsov, V, Gusev, K, Guthikonda, KK, Hampel, W, Hegai, A, Heisel, M, Hemmer, S, Heusser, G, Hofmann, W, Hult, M, Inzhechik, LV, Ioannucci, L, Janicskó Csáthy, J, Jochum, J, Junker, M, Kankanyan, R, Kianovsky, S, Kihm, T, Kiko, J, Kirpichnikov, IV, Kirsch, A, Klimenko, A, Knapp, M, Knöpfle, KT, Kochetov, O, Kornoukhov, VN, Kröninger, K, Kusminov, V, Laubenstein, M, Lazzaro, A, Lebedev, VI, and Lehnert, B

Abstract

The Gerda collaboration is performing a search for neutrinoless double beta decay of76Ge with the eponymous detector. The experiment has been installed and commissioned at the Laboratori Nazionali del Gran Sasso and has started operation in November 2011. The design, construction and first operational results are described, along with detailed information from the R&D phase. © 2013 The Author(s).

Published
2013

46. Results on neutrinoless double-$\beta$ decay of $^{76}Ge$ from phase I of the GERDA experiment

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Barnabé Heider, M., Barros, N., Baudis, L., Bauer, C., Becerici-Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, R., Budjáš, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, Nikodem, Gangapshev, A., Garfagnini, A., Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, S., Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Janicskó Csáthy, J., Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knöpfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A. A., Majorovits, B., Maneschg, W., Misiaszek, Marcin, Nemchenok, I., Nisi, S., O’Shaughnessy, C., Pandola, L., Pelczar, Krzysztof, Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, C., Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schönert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., Ur, C. A., Vasenko, A. A., Volynets, O., von Sturm, K., Wagner, V., Walter, M., Wegmann, A., Wester, T., Wójcik, Marcin, Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, Grzegorz

Abstract

Neutrinoless double beta decay is a process that violates lepton number conservation. It is predicted to occur in extensions of the standard model of particle physics. This Letter reports the results from phase I of the Germanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (Italy) searching for neutrinoless double beta decay of the isotope $^{76}Ge$. Data considered in the present analysis have been collected between November 2011 and May 2013 with a total exposure of 21.6 kg yr. A blind analysis is performed. The background index is about $1 \times 10^{-2}$ counts / (keV kg yr) after pulse shape discrimination. No signal is observed and a lower limit is derived for the half-life of neutrinoless double beta decay of $^{76} Ge, T_{1/2}^{0v}> 2.1 \times 10^{25}$ yr (90% C.L.). The combination with the results from the previous experiments with $^{76}Ge$ yields $T_{1/2}^{0v}> 3.0 \times 10^{25}$ yr (90% C.L.).

Published
2013

47. Results on Neutrinoless Double-beta Decay of Ge-76 from Phase I of the GERDA Experiment

Author

Agostini, M., Allardt, M., Andreotti, E., Bakalyarov, A. M., Balata, M., Barabanov, I., Heider, M. B., Barros, N., Baudis, L., Bauer, C., Becerici Schmidt, N., Bellotti, E., Belogurov, S., Belyaev, S. T., Benato, G., Bettini, A., Bezrukov, L., Bode, T., Brudanin, V., Brugnera, Riccardo, Budjas, D., Caldwell, A., Cattadori, C., Chernogorov, A., Cossavella, F., Demidova, E. V., Domula, A., Egorov, V., Falkenstein, R., Ferella, A., Freund, K., Frodyma, N., Gangapshev, A., Garfagnini, Alberto, Gotti, C., Grabmayr, P., Gurentsov, V., Gusev, K., Guthikonda, K. K., Hampel, W., Hegai, A., Heisel, M., Hemmer, SABINE ELISABETH, Heusser, G., Hofmann, W., Hult, M., Inzhechik, L. V., Ioannucci, L., Csathy, J. J., Jochum, J., Junker, M., Kihm, T., Kirpichnikov, I. V., Kirsch, A., Klimenko, A., Knopfle, K. T., Kochetov, O., Kornoukhov, V. N., Kuzminov, V. V., Laubenstein, M., Lazzaro, A., Lebedev, V. I., Lehnert, B., Liao, H. Y., Lindner, M., Lippi, I., Liu, X., Lubashevskiy, A., Lubsandorzhiev, B., Lutter, G., Macolino, C., Machado, A. A., Majorovits, B., Maneschg, W., Misiaszek, M., Nemchenok, I., Nisi, S., O'Shaughnessy, C., Pandola, L., Pelczar, K., Pessina, G., Pullia, A., Riboldi, S., Rumyantseva, N., Sada, Cinzia, Salathe, M., Schmitt, C., Schreiner, J., Schulz, O., Schwingenheuer, B., Schonert, S., Shevchik, E., Shirchenko, M., Simgen, H., Smolnikov, A., Stanco, L., Strecker, H., Tarka, M., C. A., Ur, Vasenko, A. A., Volynets, O., VON STURM ZU VEHLINGEN, KATHARINA CACILIE, Wagner, V., Walter, M., Wegmann, A., Wester, T., Wojcik, M., Yanovich, E., Zavarise, P., Zhitnikov, I., Zhukov, S. V., Zinatulina, D., Zuber, K., and Zuzel, G.

Published
2013

48. Production, characterization and operation of $$^{76}$$ 76 Ge enriched BEGe detectors in GERDA

Author

Agostini, M., primary, Allardt, M., additional, Andreotti, E., additional, Bakalyarov, A. M., additional, Balata, M., additional, Barabanov, I., additional, Barros, N., additional, Baudis, L., additional, Bauer, C., additional, Becerici-Schmidt, N., additional, Bellotti, E., additional, Belogurov, S., additional, Belyaev, S. T., additional, Benato, G., additional, Bettini, A., additional, Bezrukov, L., additional, Bode, T., additional, Borowicz, D., additional, Brudanin, V., additional, Brugnera, R., additional, Budjáš, D., additional, Caldwell, A., additional, Cattadori, C., additional, Chernogorov, A., additional, D’Andrea, V., additional, Demidova, E. V., additional, Domula, A., additional, Egorov, V., additional, Falkenstein, R., additional, Freund, K., additional, Frodyma, N., additional, Gangapshev, A., additional, Garfagnini, A., additional, Gotti, C., additional, Grabmayr, P., additional, Gurentsov, V., additional, Gusev, K., additional, Hegai, A., additional, Heisel, M., additional, Hemmer, S., additional, Heusser, G., additional, Hofmann, W., additional, Hult, M., additional, Inzhechik, L. V., additional, Ioannucci, L., additional, Janicskó Csáthy, J., additional, Jochum, J., additional, Junker, M., additional, Kazalov, V., additional, Kihm, T., additional, Kirpichnikov, I. V., additional, Kirsch, A., additional, Klimenko, A., additional, Knöpfle, K. T., additional, Kochetov, O., additional, Kornoukhov, V. N., additional, Kuzminov, V. V., additional, Laubenstein, M., additional, Lazzaro, A., additional, Lebedev, V. I., additional, Lehnert, B., additional, Liao, H. Y., additional, Lindner, M., additional, Lippi, I., additional, Lubashevskiy, A., additional, Lubsandorzhiev, B., additional, Lutter, G., additional, Macolino, C., additional, Majorovits, B., additional, Maneschg, W., additional, Misiaszek, M., additional, Nemchenok, I., additional, Nisi, S., additional, O’Shaughnessy, C., additional, Palioselitis, D., additional, Pandola, L., additional, Pelczar, K., additional, Pessina, G., additional, Pullia, A., additional, Riboldi, S., additional, Rumyantseva, N., additional, Sada, C., additional, Salathe, M., additional, Schmitt, C., additional, Schreiner, J., additional, Schulz, O., additional, Schütz, A. -K., additional, Schwingenheuer, B., additional, Schönert, S., additional, Shevchik, E., additional, Shirchenko, M., additional, Simgen, H., additional, Smolnikov, A., additional, Stanco, L., additional, Strecker, H., additional, Ur, C. A., additional, Vanhoefer, L., additional, Vasenko, A. A., additional, von Sturm, K., additional, Wagner, V., additional, Walter, M., additional, Wegmann, A., additional, Wester, T., additional, Wilsenach, H., additional, Wojcik, M., additional, Yanovich, E., additional, Zavarise, P., additional, Zhitnikov, I., additional, Zhukov, S. V., additional, Zinatulina, D., additional, Zuber, K., additional, and Zuzel, G., additional

Published
2015
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49. Improvement of calorimeter-based muon identification and its application to $H \to ZZ^{(*)}\to 4l$ analysis in the ATLAS experiment

Author

Becerici Schmidt, N

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

Outermost part of the ATLAS detector, the muon spectrometer, is dedicated for detection of muons and measurement of their properties. However, combining the measurements from other parts of the detector with muon spectrometer measurements improves the performance of reconstruction and identification of muons. A complementary method to these strategies is the identification of muons in the calorimeter, without using the muon spectrometer measurements. Energy deposition of muons in the calorimeter has distinct characteristics, which enables their identification by using the energy loss measurements. This method is especially useful for identification of the muons that are failed to be reconstructed due to their insufficiently low momenta to traverse the full muon spectrometer or even to reach it, or due to traversing low-acceptance regions of the muon spectrometer. One of the calorimeter-based muon identification algorithms has been improved within this thesis work. The performance of the improved algorithm and the results of its application to H → ZZ* → 4l analysis are presented. Also, possible extensions for further improvements are discussed.

Published
2009

50. The background in the $$0\nu \beta \beta $$ 0 ν β β experiment Gerda

Author

Agostini, M., primary, Allardt, M., additional, Andreotti, E., additional, Bakalyarov, A. M., additional, Balata, M., additional, Barabanov, I., additional, Barnabé Heider, M., additional, Barros, N., additional, Baudis, L., additional, Bauer, C., additional, Becerici-Schmidt, N., additional, Bellotti, E., additional, Belogurov, S., additional, Belyaev, S. T., additional, Benato, G., additional, Bettini, A., additional, Bezrukov, L., additional, Bode, T., additional, Brudanin, V., additional, Brugnera, R., additional, Budjáš, D., additional, Caldwell, A., additional, Cattadori, C., additional, Chernogorov, A., additional, Cossavella, F., additional, Demidova, E. V., additional, Domula, A., additional, Egorov, V., additional, Falkenstein, R., additional, Ferella, A., additional, Freund, K., additional, Frodyma, N., additional, Gangapshev, A., additional, Garfagnini, A., additional, Gotti, C., additional, Grabmayr, P., additional, Gurentsov, V., additional, Gusev, K., additional, Guthikonda, K. K., additional, Hampel, W., additional, Hegai, A., additional, Heisel, M., additional, Hemmer, S., additional, Heusser, G., additional, Hofmann, W., additional, Hult, M., additional, Inzhechik, L. V., additional, Ioannucci, L., additional, Csáthy, J. Janicskó, additional, Jochum, J., additional, Junker, M., additional, Kihm, T., additional, Kirpichnikov, I. V., additional, Kirsch, A., additional, Klimenko, A., additional, Knöpfle, K. T., additional, Kochetov, O., additional, Kornoukhov, V. N., additional, Kuzminov, V. V., additional, Laubenstein, M., additional, Lazzaro, A., additional, Lebedev, V. I., additional, Lehnert, B., additional, Liao, H. Y., additional, Lindner, M., additional, Lippi, I., additional, Liu, X., additional, Lubashevskiy, A., additional, Lubsandorzhiev, B., additional, Lutter, G., additional, Macolino, C., additional, Machado, A. A., additional, Majorovits, B., additional, Maneschg, W., additional, Nemchenok, I., additional, Nisi, S., additional, O’Shaughnessy, C., additional, Palioselitis, D., additional, Pandola, L., additional, Pelczar, K., additional, Pessina, G., additional, Pullia, A., additional, Riboldi, S., additional, Sada, C., additional, Salathe, M., additional, Schmitt, C., additional, Schreiner, J., additional, Schulz, O., additional, Schwingenheuer, B., additional, Schönert, S., additional, Shevchik, E., additional, Shirchenko, M., additional, Simgen, H., additional, Smolnikov, A., additional, Stanco, L., additional, Strecker, H., additional, Tarka, M., additional, Ur, C. A., additional, Vasenko, A. A., additional, Volynets, O., additional, von Sturm, K., additional, Wagner, V., additional, Walter, M., additional, Wegmann, A., additional, Wester, T., additional, Wojcik, M., additional, Yanovich, E., additional, Zavarise, P., additional, Zhitnikov, I., additional, Zhukov, S. V., additional, Zinatulina, D., additional, Zuber, K., additional, and Zuzel, G., additional

Published
2014
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