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1826191544639553536
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MIT
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© 2015 Elsevier B.V. A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 01+, 21+ and 22+ transitions of 0νββ decay were evaluated in an exposure of 89.5 kg⋅yr of 136Xe, while the same transitions of 2νββ decay were evaluated in an exposure of 61.8 kg⋅yr. No excess over background was found for all decay modes. The lower half-life limits of the 21+ state transitions of 0νββ and 2νββ decay were improved to T1/20ν(0+→21+)>2.6×1025 yr and T1/22ν(0+→21+)>4.6×1023 yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 01+ state of 136Xe for 0νββ and 2νββ decay. They are T1/20ν(0+→01+)>2.4×1025 yr and T1/22ν(0+→01+)>8.3×1023 yr (90% C.L.). The transitions to the 22+ states are also evaluated for the first time to be T1/20ν(0+→22+)>2.6×1025 yr and T1/22ν(0+→22+)>9.0×1023 yr (90% C.L.). These results are compared to recent theoretical predictions.
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2024-09-23T08:57:53Z
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Article
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mit-1721.1/133934
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Massachusetts Institute of Technology
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English
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2024-09-23T08:57:53Z
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2021
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Elsevier BV
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dspace
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mit-1721.1/1339342022-04-01T20:12:14Z Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment © 2015 Elsevier B.V. A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 01+, 21+ and 22+ transitions of 0νββ decay were evaluated in an exposure of 89.5 kg⋅yr of 136Xe, while the same transitions of 2νββ decay were evaluated in an exposure of 61.8 kg⋅yr. No excess over background was found for all decay modes. The lower half-life limits of the 21+ state transitions of 0νββ and 2νββ decay were improved to T1/20ν(0+→21+)>2.6×1025 yr and T1/22ν(0+→21+)>4.6×1023 yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 01+ state of 136Xe for 0νββ and 2νββ decay. They are T1/20ν(0+→01+)>2.4×1025 yr and T1/22ν(0+→01+)>8.3×1023 yr (90% C.L.). The transitions to the 22+ states are also evaluated for the first time to be T1/20ν(0+→22+)>2.6×1025 yr and T1/22ν(0+→22+)>9.0×1023 yr (90% C.L.). These results are compared to recent theoretical predictions. 2021-10-27T19:57:16Z 2021-10-27T19:57:16Z 2016 2019-04-22T16:27:23Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/133934 en 10.1016/J.NUCLPHYSA.2015.11.011 Nuclear Physics A Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier BV arXiv
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| spellingShingle |
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
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| title |
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
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| title_full |
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
|
| title_fullStr |
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
|
| title_full_unstemmed |
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
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| title_short |
Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment
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| title_sort |
search for double beta decay of 136xe to excited states of 136ba with the kamland zen experiment
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| url |
https://hdl.handle.net/1721.1/133934
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