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Title: Search for 2 ν β β decay of Xe 136 to the 0 1 + excited state of Ba 136 with the EXO-200 liquid xenon detector

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of 136Xe to the ground state of 136Ba. We report here on a search for the two-neutrino ββ decay of 136Xe to the first 0 + excited state, 0 + 1, of Ba136 based on a 100 kg yr exposure of 136Xe. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7×10 24 yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T 1/2 (0 + → 0 + 1) > 6.9 ×10 23 yr at 90% CL. In conclusion, this observed limit is consistent with the estimated half-life of 2.5×10 25 yr.
Authors:
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Publication Date:
Report Number(s):
SLAC-PUB-16596
Journal ID: ISSN 2469-9985; PRVCAN; arXiv:1511.04770
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 93; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
APS
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
EXO-200 Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; experiment-HEP; experiment-nucl; HEPEX
OSTI Identifier:
1261078
Alternate Identifier(s):
OSTI ID: 1242579

Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., King, J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Winick, T. A., Wood, J., Xu, Q. Y., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.. Search for 2νββ decay of Xe136 to the 01+ excited state of Ba136 with the EXO-200 liquid xenon detector. United States: N. p., Web. doi:10.1103/PhysRevC.93.035501.
Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., King, J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Winick, T. A., Wood, J., Xu, Q. Y., Yang, L., Yen, Y. -R., & Zeldovich, O. Ya.. Search for 2νββ decay of Xe136 to the 01+ excited state of Ba136 with the EXO-200 liquid xenon detector. United States. doi:10.1103/PhysRevC.93.035501.
Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., King, J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Winick, T. A., Wood, J., Xu, Q. Y., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.. 2016. "Search for 2νββ decay of Xe136 to the 01+ excited state of Ba136 with the EXO-200 liquid xenon detector". United States. doi:10.1103/PhysRevC.93.035501. https://www.osti.gov/servlets/purl/1261078.
@article{osti_1261078,
title = {Search for 2νββ decay of Xe136 to the 01+ excited state of Ba136 with the EXO-200 liquid xenon detector},
author = {Albert, J. B. and Auty, D. J. and Barbeau, P. S. and Beck, D. and Belov, V. and Breidenbach, M. and Brunner, T. and Burenkov, A. and Cao, G. F. and Chambers, C. and Chaves, J. and Cleveland, B. and Coon, M. and Craycraft, A. and Daniels, T. and Danilov, M. and Daugherty, S. J. and Davis, J. and Delaquis, S. and Der Mesrobian-Kabakian, A. and DeVoe, R. and Didberidze, T. and Dilling, J. and Dolgolenko, A. and Dolinski, M. J. and Dunford, M. and Fairbank, W. and Farine, J. and Feldmeier, W. and Feyzbakhsh, S. and Fierlinger, P. and Fudenberg, D. and Gornea, R. and Graham, K. and Gratta, G. and Hall, C. and Hughes, M. and Jewell, M. J. and Johnson, A. and Johnson, T. N. and Johnston, S. and Karelin, A. and Kaufman, L. J. and Killick, R. and King, J. and Koffas, T. and Kravitz, S. and Krücken, R. and Kuchenkov, A. and Kumar, K. S. and Leonard, D. S. and Licciardi, C. and Lin, Y. H. and Ling, J. and MacLellan, R. and Marino, M. G. and Mong, B. and Moore, D. and Njoya, O. and Nelson, R. and Odian, A. and Ostrovskiy, I. and Piepke, A. and Pocar, A. and Prescott, C. Y. and Retière, F. and Rowson, P. C. and Russell, J. J. and Schubert, A. and Sinclair, D. and Smith, E. and Stekhanov, V. and Tarka, M. and Tolba, T. and Tsang, R. and Twelker, K. and Vogel, P. and Vuilleumier, J. -L. and Waite, A. and Walton, J. and Walton, T. and Weber, M. and Wen, L. J. and Wichoski, U. and Winick, T. A. and Wood, J. and Xu, Q. Y. and Yang, L. and Yen, Y. -R. and Zeldovich, O. Ya.},
abstractNote = {EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of 136Xe to the ground state of 136Ba. We report here on a search for the two-neutrino ββ decay of 136Xe to the first 0+ excited state, 0+1, of Ba136 based on a 100 kg yr exposure of 136Xe. 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 T2ν1/2 (0+ → 0+1) > 6.9 ×1023 yr at 90% CL. In conclusion, this observed limit is consistent with the estimated half-life of 2.5×1025 yr.},
doi = {10.1103/PhysRevC.93.035501},
journal = {Physical Review C},
number = 3,
volume = 93,
place = {United States},
year = {2016},
month = {3}
}