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Title: Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment

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 0 1 + , 2 1 + and 2 2 + 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 2 1 + state transitions of 0νββ and 2νββ decay were improved to T$$0v\atop{1/2}$$(0 + →2 1 +) > 2.6×10 25 yr and T$$2v\atop{1/2}$$ (0 + →2 1 +) > 4.6×10 23 yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 0 1 + state of 136Xe for 0νββ and 2νββ decay. They are T$$0v\atop{1/2}$$(0 + →0 1 +) > 2.4×10 25 yr and T$$2v\atop{1/2}$$(0 + →0 1 +) > 8.3×10 23 yr (90% C.L.). The transitions to the 2 2 + states are also evaluated for the first time to be T$$0v\atop{1/2}$$(0 + →2 2 +) > 2.6×10 25 yr and T$$2v\atop{1/2}$$(0 + →2 2 +) > 9.0×10 23 yr (90% C.L.). Finally, these results are compared to recent theoretical predictions.
Authors:
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  1. Tohoku University, Sendai (Japan). Research Center for Neutrino Science
  2. Tohoku University, Sendai (Japan). Research Center for Neutrino Science; The University of Tokyo, Kashiwa (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study
  3. The University of Tokyo, Kashiwa (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study
  4. Osaka University, Toyonaka (Japan). Graduate School of Science
  5. University of Tokushima (Japan). Faculty of Integrated Arts and Science
  6. Univ. of California, Berkeley, CA (United States). Physics Department; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Univ. of California, Berkeley, CA (United States). Physics Department; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); The University of Tokyo, Kashiwa (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study
  8. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  9. Univ. of Tennessee, Knoxville, TN (United States); National Research Nuclear University, Moscow (Russia); The University of Tokyo, Kashiwa (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study
  10. Triangle Universities Nuclear Laboratory, Durham, NC (United States); Duke Univ., Durham, NC (United States); North Carolina Central University, Durham, NC (United States); Univ. of North Carolina, Chapel Hill, NC (United States). Physics Dept.
  11. Triangle Universities Nuclear Laboratory, Durham, NC (United States); Duke Univ., Durham, NC (United States); North Carolina Central University, Durham, NC (United States); Univ. of North Carolina, Chapel Hill, NC (United States). Physics Dept.; Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study
  12. Univ. of Washington, Seattle, WA (United States). Center for Experimental Nuclear Physics and Astrophysics; Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study
  13. Nikhef and the University of Amsterdam, Science Park, Amsterdam (The Netherlands); Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
Journal Volume: 946; Journal Issue: C; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Double-beta decay; 136Xe; Excited state
OSTI Identifier:
1379070
Alternate Identifier(s):
OSTI ID: 1359697