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Abstract
We report on a search for double beta decay of \[^{130}\hbox {Te}\] to the first \[0^{+}\] excited state of \[^{130}\hbox {Xe}\] using a \[9.8\,\hbox {kg}\cdot \hbox {yr}\] exposure of \[^{130}\hbox {Te}\] collected with the CUORE-0 experiment. In this work we exploit different topologies of coincident events to search for both the neutrinoless and two-neutrino double beta decay modes. We find no evidence for either mode and place lower bounds on the half-lives: \[T^{0\nu }_{0^+_1}>7.9\cdot 10^{23}\hbox {yr}\] and \[T^{2\nu }_{0^+_1}>2.4\cdot 10^{23}\hbox {yr}\] (\[90\%\,\hbox {CL}\]). Combining our results with those obtained by the CUORICINO experiment, we achieve the most stringent constraints available for these processes: \[T^{0\nu }_{0^+_1}>1.4\cdot 10^{24}\hbox {yr}\] and \[T^{2\nu }_{0^+_1}>2.5\cdot 10^{23}\hbox {yr}\] (\[90\%\,\hbox {CL}\]).
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1 Department of Physics and Astronomy, University of South Carolina, Columbia, SC, USA
2 Department of Physics and Astronomy, University of California, Los Angeles, CA, USA
3 Department of Physics and Astronomy, University of South Carolina, Columbia, SC, USA; INFN-Laboratori Nazionali del Gran Sasso, Assergi, L’Aquila, Italy
4 INFN-Laboratori Nazionali di Legnaro, Legnaro, Padua, Italy
5 Department of Physics, University of California, Berkeley, CA, USA; Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
6 INFN-Sezione di Bologna, Bologna, Italy
7 Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
8 Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy; INFN-Sezione di Roma, Rome, Italy
9 INFN-Sezione di Genova, Genova, Italy
10 INFN-Sezione di Milano Bicocca, Milan, Italy
11 Dipartimento di Fisica, Università di Milano-Bicocca, Milan, Italy; INFN-Sezione di Milano Bicocca, Milan, Italy
12 INFN-Laboratori Nazionali del Gran Sasso, Assergi, L’Aquila, Italy
13 INFN-Laboratori Nazionali del Gran Sasso, Assergi, L’Aquila, Italy; Massachusetts Institute of Technology, Cambridge, MA, USA
14 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China
15 INFN-Sezione di Genova, Genova, Italy; Dipartimento di Fisica, Università di Genova, Genoa, Italy
16 Department of Physics, Yale University, New Haven, CT, USA
17 INFN-Sezione di Roma, Rome, Italy
18 INFN-Laboratori Nazionali del Gran Sasso, Assergi, L’Aquila, Italy; INFN-Gran Sasso Science Institute, L’Aquila, Italy
19 Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
20 INFN-Laboratori Nazionali di Frascati, Rome, Italy
21 CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France
22 Massachusetts Institute of Technology, Cambridge, MA, USA
23 Physics Department, California Polytechnic State University, San Luis Obispo, CA, USA
24 Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA; Department of Materials Science and Engineering, University of California, Berkeley, CA, USA
25 Department of Physics, Yale University, New Haven, CT, USA; Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
26 Department of Physics and Astronomy, University of California, Los Angeles, CA, USA; Massachusetts Institute of Technology, Cambridge, MA, USA
27 Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
28 Department of Physics, University of California, Berkeley, CA, USA; Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA; Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
29 Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy; INFN-Sezione di Roma, Rome, Italy; Laboratorio de Fisica Nuclear y Astroparticulas, Universidad de Zaragoza, Zaragoza, Spain
30 INFN-Sezione di Bologna, Bologna, Italy; Dipartimento di Scienze per la Qualità della Vita, Alma Mater Studiorum-Università di Bologna, Bologna, Italy
31 Service de Physique des Particules, CEA/Saclay, Gif-sur-Yvette, France
32 Lawrence Livermore National Laboratory, Livermore, CA, USA; Department of Nuclear Engineering, University of California, Berkeley, CA, USA
33 Department of Physics, University of California, Berkeley, CA, USA; Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA; Massachusetts Institute of Technology, Cambridge, MA, USA
34 INFN-Laboratori Nazionali del Gran Sasso, Assergi, L’Aquila, Italy; Dipartimento di Ingegneria Civile e Meccanica, Università degli Studi di Cassino e del Lazio Meridionale, Cassino, Italy
35 Lawrence Livermore National Laboratory, Livermore, CA, USA
36 INFN-Laboratori Nazionali del Gran Sasso, Assergi, L’Aquila, Italy; Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, L’Aquila, Italy
37 Department of Physics, University of California, Berkeley, CA, USA
38 INFN-Sezione di Padova, Padua, Italy
39 Department of Physics, Yale University, New Haven, CT, USA; Department of Physics, University of Wisconsin, Madison, WI, USA
40 SUPA, Institute for Astronomy, University of Edinburgh, Edinburgh, UK
41 Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
42 INFN-Sezione di Bologna, Bologna, Italy; Dipartimento di Fisica e Astronomia, Alma Mater Studiorum-Università di Bologna, Bologna, Italy