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Title: Results from KamLAND-Zen

KamLAND-Zen reports on a preliminary search for neutrinoless double-beta decay with 136Xe based on 114.8 live-days after the purification of the xenon loaded liquid scintillator. In this data, the problematic 110mAg background peak identified in previous searches is reduced by more than a factor of 10. By combining the KamLAND-Zen pre- and post-purification data, we obtain a preliminary lower limit on the 0νββ decay half-life of T1/2 > 2.6×1025 yr at 90% C.L. The search sensitivity will be enhanced with additional low background data after the purification. As a result, prospects for further improvements with future KamLAND-Zen upgrades are also presented.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] more »;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [4] ;  [5] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [8] ;  [11] ;  [12] ;  [13] ;  [14] ;  [14] ;  [15] ;  [16] ;  [17] ;  [17] « less
  1. Tohoku Univ., Miyagi (Japan)
  2. Tohoku Univ., Miyagi (Japan); Univ. of Tokyo, Kashiwa (Japan)
  3. Tohoku Univ., Miyagi (Japan); High Energy Accelerator Research Organization, Ibaraki (Japan)
  4. Tohoku Univ., Miyagi (Japan); Osaka Univ., Oasaka (Japan)
  5. Univ. of Tokyo, Kashiwa (Japan)
  6. Osaka Univ., Osaka (Japan)
  7. Univ. of Tokushima, Tokushima (Japan)
  8. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  9. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States);
  10. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Tokyo, Kashiwa (Japan)
  11. Univ. of California, Los Angeles, CA (United States)
  12. Colorado State Univ., Fort Collins, CO (United States)
  13. Univ. of Tennessee, Knoxville, TN (United States); Univ. of Tokyo, Kashiwa (Japan)
  14. Triangle Univ. Nuclear Lab., Durham, NC (United States); Duke Univ., Durham, NC (United States); North Carolina Central Univ., Durham, NC (United States); Univ. of North Carolina at Chapel Hill, Chapel Hill, NC (United States)
  15. Triangle Univ. Nuclear Lab., Durham, NC (United States); Duke Univ., Durham, NC (United States); North Carolina Central Univ., Durham, NC (United States); Univ. of North Carolina at Chapel Hill, Chapel Hill, NC (United States); Univ. of Tokyo, Kashiwa (Japan)
  16. Univ. of Washington, Seattle, WA (United States)
  17. Univ. of Washington, Seattle, WA (United States); Univ. of Tokyo, Kashiwa (United States)
Publication Date:
OSTI Identifier:
1213578
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1666; Conference: XXVI International Conference on Neutrino Physics and Astrophysics, Boston, MA (United States), 2–7 June 2014; Journal ID: ISSN 0094-243X
Publisher:
AIP
Research Org:
Lawrence Berkeley National Laboratory (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; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS double beta decay; majorana neutrino mass