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Main Authors:	Kharusi, S. Al, Anton, G., Badhrees, I., Barbeau, P. S., Belov, V., Bhatta, T., Breidenbach, M., Brunner, T., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Darroch, L., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Dolgolenko, A., Dolinski, M. J., Echevers, J., Eckert, B., Fairbank Jr., W., Fairbank, D., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fu, Y. S., Fudenberg, D., Gautam, P., Gornea, R., Gratta, G., Hall, C., Hansen, E. V., Hoessl, J., Hufschmidt, P., Hughes, M., Iverson, A., Jamil, A., Jessiman, C., Jewell, M. J., Johnson, A., Karelin, A., Kaufman, L. J., Koffas, T., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Larson, A., Lenardo, B. G., Leonard, D. S., Li, G. S., Li, S., Li, Z., Licciardi, C., Lin, Y. H., MacLellan, R., McElroy, T., Michel, T., Mong, B., Moore, D. C., Murray, K., Njoya, O., Nusair, O., Odian, A., Ostrovskiy, I., Smalley, H. Peltz, Perna, A., Piepke, A., Pocar, A., Retière, F., Robinson, A. L., Rowson, P. C., Schmidt, S., Sinclair, D., Skarpaas, K., Soma, A. K., Stekhanov, V., Tarka, M., Thibado, S., Todd, J., Tolba, T., Totev, T. I., Tsang, R., Veenstra, B., Veeraraghavan, V., Vogel, P., Vuilleumier, J. -L., Wagenpfeil, M., Watkins, J., Weber, M., Wen, L. J., Wichoski, U., Wrede, G., Wu, S. X., Xia, Q., Yahne, D. R., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., Ziegler, T.
Format:	Preprint
Published:	2025
Subjects:	Nuclear Experiment
Online Access:	https://arxiv.org/abs/2511.13990
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author	Kharusi, S. Al Anton, G. Badhrees, I. Barbeau, P. S. Belov, V. Bhatta, T. Breidenbach, M. Brunner, T. Cao, G. F. Cen, W. R. Chambers, C. Cleveland, B. Coon, M. Craycraft, A. Daniels, T. Darroch, L. Daugherty, S. J. Davis, J. Delaquis, S. Der Mesrobian-Kabakian, A. DeVoe, R. Dolgolenko, A. Dolinski, M. J. Echevers, J. Eckert, B. Fairbank Jr., W. Fairbank, D. Farine, J. Feyzbakhsh, S. Fierlinger, P. Fu, Y. S. Fudenberg, D. Gautam, P. Gornea, R. Gratta, G. Hall, C. Hansen, E. V. Hoessl, J. Hufschmidt, P. Hughes, M. Iverson, A. Jamil, A. Jessiman, C. Jewell, M. J. Johnson, A. Karelin, A. Kaufman, L. J. Koffas, T. Krücken, R. Kuchenkov, A. Kumar, K. S. Lan, Y. Larson, A. Lenardo, B. G. Leonard, D. S. Li, G. S. Li, S. Li, Z. Licciardi, C. Lin, Y. H. MacLellan, R. McElroy, T. Michel, T. Mong, B. Moore, D. C. Murray, K. Njoya, O. Nusair, O. Odian, A. Ostrovskiy, I. Smalley, H. Peltz Perna, A. Piepke, A. Pocar, A. Retière, F. Robinson, A. L. Rowson, P. C. Schmidt, S. Sinclair, D. Skarpaas, K. Soma, A. K. Stekhanov, V. Tarka, M. Thibado, S. Todd, J. Tolba, T. Totev, T. I. Tsang, R. Veenstra, B. Veeraraghavan, V. Vogel, P. Vuilleumier, J. -L. Wagenpfeil, M. Watkins, J. Weber, M. Wen, L. J. Wichoski, U. Wrede, G. Wu, S. X. Xia, Q. Yahne, D. R. Yang, L. Yen, Y. -R. Zeldovich, O. Ya. Ziegler, T.
author_facet	Kharusi, S. Al Anton, G. Badhrees, I. Barbeau, P. S. Belov, V. Bhatta, T. Breidenbach, M. Brunner, T. Cao, G. F. Cen, W. R. Chambers, C. Cleveland, B. Coon, M. Craycraft, A. Daniels, T. Darroch, L. Daugherty, S. J. Davis, J. Delaquis, S. Der Mesrobian-Kabakian, A. DeVoe, R. Dolgolenko, A. Dolinski, M. J. Echevers, J. Eckert, B. Fairbank Jr., W. Fairbank, D. Farine, J. Feyzbakhsh, S. Fierlinger, P. Fu, Y. S. Fudenberg, D. Gautam, P. Gornea, R. Gratta, G. Hall, C. Hansen, E. V. Hoessl, J. Hufschmidt, P. Hughes, M. Iverson, A. Jamil, A. Jessiman, C. Jewell, M. J. Johnson, A. Karelin, A. Kaufman, L. J. Koffas, T. Krücken, R. Kuchenkov, A. Kumar, K. S. Lan, Y. Larson, A. Lenardo, B. G. Leonard, D. S. Li, G. S. Li, S. Li, Z. Licciardi, C. Lin, Y. H. MacLellan, R. McElroy, T. Michel, T. Mong, B. Moore, D. C. Murray, K. Njoya, O. Nusair, O. Odian, A. Ostrovskiy, I. Smalley, H. Peltz Perna, A. Piepke, A. Pocar, A. Retière, F. Robinson, A. L. Rowson, P. C. Schmidt, S. Sinclair, D. Skarpaas, K. Soma, A. K. Stekhanov, V. Tarka, M. Thibado, S. Todd, J. Tolba, T. Totev, T. I. Tsang, R. Veenstra, B. Veeraraghavan, V. Vogel, P. Vuilleumier, J. -L. Wagenpfeil, M. Watkins, J. Weber, M. Wen, L. J. Wichoski, U. Wrede, G. Wu, S. X. Xia, Q. Yahne, D. R. Yang, L. Yen, Y. -R. Zeldovich, O. Ya. Ziegler, T.
contents	EXO-200 was a leading double beta decay experiment consisting of a single-phase, enriched liquid xenon time projection chamber filled with an admixture of 80.672% $^{136}$Xe and 19.098% $^{134}$Xe. The detector operated at WIPP between 2010 and 2018 and was designed to search for double beta decay of $^{136}$Xe. Data was acquired in two phases separated by a period of detector upgrades. We report on the search for $0νββ$ and $2νββ$ decay of $^{134}$Xe with Phase II EXO-200 data, with median 90% C.L. exclusion sensitivity $T_{1/2}^{0ν} \geq 3.7\times 10^{23}$ yr and $T_{1/2}^{2ν} \geq 2.6 \times 10^{21}$ yr, respectively. No statistically significant signal is observed for either decay mode. We set a world-leading lower limit on the half-life of the neutrinoless decay mode of $^{134}$Xe of $T_{1/2}^{0ν} \geq 8.7\times10^{23}$ (90% C.L.) and the second strongest constraint on the two-neutrino decay of $T_{1/2}^{2ν} \geq 2.9\times10^{21}$ (90% C.L.), a 3-fold improvement over the EXO-200 Phase I measurement. New constraints are also set for the $2νββ$ and $0νββ$ decays of $^{134}$Xe to the lowest excited state of $^{134}$Ba.
format	Preprint
id	arxiv_https___arxiv_org_abs_2511_13990
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Search for Double Beta Decays of $^{134}$Xe with EXO-200 Phase II Kharusi, S. Al Anton, G. Badhrees, I. Barbeau, P. S. Belov, V. Bhatta, T. Breidenbach, M. Brunner, T. Cao, G. F. Cen, W. R. Chambers, C. Cleveland, B. Coon, M. Craycraft, A. Daniels, T. Darroch, L. Daugherty, S. J. Davis, J. Delaquis, S. Der Mesrobian-Kabakian, A. DeVoe, R. Dolgolenko, A. Dolinski, M. J. Echevers, J. Eckert, B. Fairbank Jr., W. Fairbank, D. Farine, J. Feyzbakhsh, S. Fierlinger, P. Fu, Y. S. Fudenberg, D. Gautam, P. Gornea, R. Gratta, G. Hall, C. Hansen, E. V. Hoessl, J. Hufschmidt, P. Hughes, M. Iverson, A. Jamil, A. Jessiman, C. Jewell, M. J. Johnson, A. Karelin, A. Kaufman, L. J. Koffas, T. Krücken, R. Kuchenkov, A. Kumar, K. S. Lan, Y. Larson, A. Lenardo, B. G. Leonard, D. S. Li, G. S. Li, S. Li, Z. Licciardi, C. Lin, Y. H. MacLellan, R. McElroy, T. Michel, T. Mong, B. Moore, D. C. Murray, K. Njoya, O. Nusair, O. Odian, A. Ostrovskiy, I. Smalley, H. Peltz Perna, A. Piepke, A. Pocar, A. Retière, F. Robinson, A. L. Rowson, P. C. Schmidt, S. Sinclair, D. Skarpaas, K. Soma, A. K. Stekhanov, V. Tarka, M. Thibado, S. Todd, J. Tolba, T. Totev, T. I. Tsang, R. Veenstra, B. Veeraraghavan, V. Vogel, P. Vuilleumier, J. -L. Wagenpfeil, M. Watkins, J. Weber, M. Wen, L. J. Wichoski, U. Wrede, G. Wu, S. X. Xia, Q. Yahne, D. R. Yang, L. Yen, Y. -R. Zeldovich, O. Ya. Ziegler, T. Nuclear Experiment EXO-200 was a leading double beta decay experiment consisting of a single-phase, enriched liquid xenon time projection chamber filled with an admixture of 80.672% $^{136}$Xe and 19.098% $^{134}$Xe. The detector operated at WIPP between 2010 and 2018 and was designed to search for double beta decay of $^{136}$Xe. Data was acquired in two phases separated by a period of detector upgrades. We report on the search for $0νββ$ and $2νββ$ decay of $^{134}$Xe with Phase II EXO-200 data, with median 90% C.L. exclusion sensitivity $T_{1/2}^{0ν} \geq 3.7\times 10^{23}$ yr and $T_{1/2}^{2ν} \geq 2.6 \times 10^{21}$ yr, respectively. No statistically significant signal is observed for either decay mode. We set a world-leading lower limit on the half-life of the neutrinoless decay mode of $^{134}$Xe of $T_{1/2}^{0ν} \geq 8.7\times10^{23}$ (90% C.L.) and the second strongest constraint on the two-neutrino decay of $T_{1/2}^{2ν} \geq 2.9\times10^{21}$ (90% C.L.), a 3-fold improvement over the EXO-200 Phase I measurement. New constraints are also set for the $2νββ$ and $0νββ$ decays of $^{134}$Xe to the lowest excited state of $^{134}$Ba.
title	Search for Double Beta Decays of $^{134}$Xe with EXO-200 Phase II
topic	Nuclear Experiment
url	https://arxiv.org/abs/2511.13990

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