Search for 2νββ decay of Xe 136 to the 01+ excited state of Ba 136 with the EXO-200 liquid xenon detector

doi:10.1103/PhysRevC.93.035501

Search for 2νββ decay of Xe 136 to the 01+ excited state of Ba 136 with the EXO-200 liquid xenon detector

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Abstract

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of Xe136 to the ground state of Ba136. We report here on a search for the two-neutrino ββ decay of Xe136 to the first 0+ excited state, 01+, of Ba136 based on a 100 kgyr exposure of Xe136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7×1024 yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T1/22ν (0+→01+) > 6.9 ×1023 yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5×1025 yr.

Original language	English
Article number	035501
Journal	Physical Review C
Volume	93
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.93.035501
State	Published - Mar 8 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

Funding

Funders	Funder number
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	1307362, 1506459, 1132428
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.93.035501

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@article{a51f9aa646194d739d40061be7a742dd,

title = "Search for 2νββ decay of Xe 136 to the 01+ excited state of Ba 136 with the EXO-200 liquid xenon detector",

abstract = "EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of Xe136 to the ground state of Ba136. We report here on a search for the two-neutrino ββ decay of Xe136 to the first 0+ excited state, 01+, of Ba136 based on a 100 kgyr exposure of Xe136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90\% CL half-life sensitivity of 1.7×1024 yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T1/22ν (0+→01+) > 6.9 ×1023 yr at 90\% CL. This observed limit is consistent with the estimated half-life of 2.5×1025 yr.",

author = "Albert, \{J. B.\} and Auty, \{D. J.\} and Barbeau, \{P. S.\} and D. Beck and V. Belov and M. Breidenbach and T. Brunner and A. Burenkov and Cao, \{G. F.\} and C. Chambers and J. Chaves and B. Cleveland and M. Coon and A. Craycraft and T. Daniels and M. Danilov and Daugherty, \{S. J.\} and J. Davis and S. Delaquis and \{Der Mesrobian-Kabakian\}, A. and R. Devoe and T. Didberidze and J. Dilling and A. Dolgolenko and Dolinski, \{M. J.\} and M. Dunford and W. Fairbank and J. Farine and W. Feldmeier and S. Feyzbakhsh and P. Fierlinger and D. Fudenberg and R. Gornea and K. Graham and G. Gratta and C. Hall and M. Hughes and Jewell, \{M. J.\} and A. Johnson and Johnson, \{T. N.\} and S. Johnston and A. Karelin and Kaufman, \{L. J.\} and R. Killick and J. King and T. Koffas and S. Kravitz and R. Kr{\"u}cken and A. Kuchenkov and R. Maclellan",

note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = mar,

day = "8",

doi = "10.1103/PhysRevC.93.035501",

language = "English",

volume = "93",

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T1 - Search for 2νββ decay of Xe 136 to the 01+ excited state of Ba 136 with the EXO-200 liquid xenon detector

AU - Albert, J. B.

AU - Auty, D. J.

AU - Barbeau, P. S.

AU - Beck, D.

AU - Belov, V.

AU - Breidenbach, M.

AU - Brunner, T.

AU - Burenkov, A.

AU - Cao, G. F.

AU - Chambers, C.

AU - Chaves, J.

AU - Cleveland, B.

AU - Coon, M.

AU - Craycraft, A.

AU - Daniels, T.

AU - Danilov, M.

AU - Daugherty, S. J.

AU - Davis, J.

AU - Delaquis, S.

AU - Der Mesrobian-Kabakian, A.

AU - Devoe, R.

AU - Didberidze, T.

AU - Dilling, J.

AU - Dolgolenko, A.

AU - Dolinski, M. J.

AU - Dunford, M.

AU - Fairbank, W.

AU - Farine, J.

AU - Feldmeier, W.

AU - Feyzbakhsh, S.

AU - Fierlinger, P.

AU - Fudenberg, D.

AU - Gornea, R.

AU - Graham, K.

AU - Gratta, G.

AU - Hall, C.

AU - Hughes, M.

AU - Jewell, M. J.

AU - Johnson, A.

AU - Johnson, T. N.

AU - Johnston, S.

AU - Karelin, A.

AU - Kaufman, L. J.

AU - Killick, R.

AU - King, J.

AU - Koffas, T.

AU - Kravitz, S.

AU - Krücken, R.

AU - Kuchenkov, A.

AU - Maclellan, R.

PY - 2016/3/8

Y1 - 2016/3/8

N2 - EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of Xe136 to the ground state of Ba136. We report here on a search for the two-neutrino ββ decay of Xe136 to the first 0+ excited state, 01+, of Ba136 based on a 100 kgyr exposure of Xe136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7×1024 yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T1/22ν (0+→01+) > 6.9 ×1023 yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5×1025 yr.

AB - EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of Xe136 to the ground state of Ba136. We report here on a search for the two-neutrino ββ decay of Xe136 to the first 0+ excited state, 01+, of Ba136 based on a 100 kgyr exposure of Xe136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7×1024 yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T1/22ν (0+→01+) > 6.9 ×1023 yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5×1025 yr.

UR - https://www.scopus.com/pages/publications/84960898685

UR - https://www.scopus.com/inward/citedby.url?scp=84960898685&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.93.035501

DO - 10.1103/PhysRevC.93.035501

M3 - Article

AN - SCOPUS:84960898685

SN - 2469-9985

VL - 93

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 035501

ER -

Search for 2νββ decay of Xe 136 to the 01+ excited state of Ba 136 with the EXO-200 liquid xenon detector

Abstract

Bibliographical note

Funding

ASJC Scopus subject areas

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