2νββ decay of 76Ge into excited states with GERDA phase I

被引：21

作者：

Agostini, M. ^{[2
,3
]}

Allardt, M. ^{[4
]}

Bakalyarov, A. M. ^{[5
]}

Balata, M. ^{[6
]}

Barabanov, I. ^{[7
]}

Barros, N. ^{[4
]}

Baudis, L. ^{[8
]}

Bauer, C. ^{[9
]}

Becerici-Schmidt, N. ^{[10
]}

Bellotti, E. ^{[11
,12
]}

Belogurov, S. ^{[13
]}

Belyaev, S. T. ^{[5
]}

Benato, G. ^{[8
]}

Bettini, A. ^{[14
,15
]}

Bezrukov, L. ^{[7
]}

Bode, T. ^{[2
,3
]}

Borowicz, D. ^{[16
,17
]}

Brudanin, V. ^{[17
]}

Brugnera, R. ^{[14
,15
]}

Budjas, D. ^{[2
,3
]}

Caldwell, A. ^{[10
]}

Cattadori, C. ^{[12
]}

Chernogorov, A. ^{[13
]}

D'Andrea, V. ^{[6
]}

Demidova, E. V. ^{[13
]}

di Vacri, A. ^{[6
]}

Domula, A. ^{[4
]}

Doroshkevich, E. ^{[7
]}

Egorov, V. ^{[17
]}

Falkenstein, R. ^{[18
]}

Fedorova, O. ^{[7
]}

Freund, K. ^{[18
]}

Frodyma, N. ^{[16
]}

Gangapshev, A. ^{[7
,9
]}

Garfagnini, A. ^{[14
,15
]}

Gooch, C. ^{[10
]}

Grabmayr, P. ^{[18
]}

Gurentsov, V. ^{[7
]}

Gusev, K. ^{[2
,3
,5
,17
]}

Hegai, A. ^{[18
]}

Heisel, M. ^{[9
]}

Hemmer, S. ^{[14
,15
]}

Heusser, G. ^{[9
]}

Hofmann, W. ^{[9
]}

Hult, M. ^{[19
]}

Inzhechik, L. V. ^{[7
]}

Csathy, J. Janicsko ^{[2
,3
]}

Jochum, J. ^{[18
]}

Junker, M. ^{[6
]}

Kazalov, V. ^{[7
]}

机构：

[1] LNGS, Assergi, Italy

[2] Tech Univ Munich, Phys Dept, D-80290 Munich, Germany

[3] Tech Univ Munich, Excellence Cluster Universe, D-80290 Munich, Germany

[4] Tech Univ Dresden, Inst Kern & Teilchenphys, D-01062 Dresden, Germany

[5] Natl Res Ctr Kurchatov Inst, Moscow, Russia

[6] INFN Lab Nazl Gran Sasso & Gran Sasso Sci Inst, Assergi, Italy

[7] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[8] Univ Zurich, Inst Phys, Zurich, Switzerland

[9] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[10] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[11] Univ Milano Bicocca, Dipartimento Fis, Milan, Italy

[12] INFN Milano Bicocca, Milan, Italy

[13] Inst Theoret & Expt Phys, Moscow 117259, Russia

[14] Univ Padua, Dipartimento Fis & Astron, Padua, Italy

[15] INFN Padova, Padua, Italy

[16] Jagiellonian Univ, Inst Phys, Krakow, Poland

[17] Joint Inst Nucl Res, Dubna, Russia

[18] Univ Tubingen, Inst Phys, Tubingen, Germany

[19] Inst Reference Mat & Measurements, Geel, Belgium

[20] Univ Milan, Dipartimento Fis, Milan, Italy

[21] INFN Milano, Milan, Italy

来源：

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2015年 / 42卷 / 11期

基金：

瑞士国家科学基金会; 俄罗斯基础研究基金会;

关键词：

double beta decay; excited states; germanium; DOUBLE-BETA-DECAY; NUCLEI;

D O I：

10.1088/0954-3899/42/11/115201

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Two neutrino double beta decay of Ge-76 to excited states of Se-76 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 Ge-76 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(g.s.)(+) - 2(1)(+): T-1/2(2 nu) > 1.6 x 10(23) yr, 0(g.s.)(+) -0(1)(+) : T-1/2(2 nu) > 3.7 x 10(23) yr and 0(g.s.)(+) - 2(2)(+) : T-1/2(2 nu) > 2.3 x 10(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(g.s.)(+) - 0(1)(+) transition.

引用

页数：18

共 31 条

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