Results from KamLAND-Zen

Asakura, K.; Gando, A.; Gando, Y.; Hachiya, T.; Hayashida, S.; Ikeda, H.; Inoue, K.; Ishidoshiro, K.; Ishikawa, T.; Ishio, S.; Koga, M.; Matsuda, R.; Matsuda, S.; Mitsui, T.; Motoki, D.; Nakamura, K.; Obara, S.; Oki, Y.; Otani, M.; Oura, T.; Shimizu, I.; Shirahata, Y.; Shirai, J.; Suzuki, A.; Tachibana, H.; Tamae, K.; Ueshima, K.; Watanabe, H.; Xu, B. D.; Yamauchi, Y.; Yoshida, H.; Kozlov, A.; Takemoto, Y.; Yoshido, S.; Fushimi, K.; Banks, T. I.; Freedman, S. J.; Fujikawa, B. K.; O'Donnell, T.; Winslow, L. A.; Berger, B. E.; Efremenko, Y.; Karwowski, H. J.; Markoff, D. M.; Tornow, W.; Detwiler, J. A.; Enomoto, S.; Decowski, M. P.

doi:10.1063/1.4915593

Title: Results from KamLAND-Zen

Journal Article · Wed Jul 15 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4915593· OSTI ID:1213578

Asakura, K. ^[1]; Gando, A. ^[1]; Gando, Y. ^[1]; Hachiya, T. ^[1]; Hayashida, S. ^[1]; Ikeda, H. ^[1]; Inoue, K. ^[2]; Ishidoshiro, K. ^[1]; Ishikawa, T. ^[1]; Ishio, S. ^[1]; Koga, M. ^[2]; Matsuda, R. ^[1]; Matsuda, S. ^[1]; Mitsui, T. ^[1]; Motoki, D. ^[1]; Nakamura, K. ^[2]; Obara, S. ^[1]; Oki, Y. ^[1]; Otani, M. ^[3]; Oura, T. ^[1] more »

Tohoku Univ., Miyagi (Japan)
Tohoku Univ., Miyagi (Japan); Univ. of Tokyo, Kashiwa (Japan)
Tohoku Univ., Miyagi (Japan); High Energy Accelerator Research Organization, Ibaraki (Japan)
Tohoku Univ., Miyagi (Japan); Osaka Univ., Oasaka (Japan)
Univ. of Tokyo, Kashiwa (Japan)
Osaka Univ., Osaka (Japan)
Univ. of Tokushima, Tokushima (Japan)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States);
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Tokyo, Kashiwa (Japan)
Univ. of California, Los Angeles, CA (United States)
Colorado State Univ., Fort Collins, CO (United States)
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Tokyo, Kashiwa (Japan)
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)
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)
Univ. of Washington, Seattle, WA (United States)
Univ. of Washington, Seattle, WA (United States); Univ. of Tokyo, Kashiwa (United States)

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 T^0ν_1/2 > 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1213578

Journal Information:: AIP Conference Proceedings, Vol. 1666; Conference: XXVI International Conference on Neutrino Physics and Astrophysics, Boston, MA (United States), 2–7 June 2014; ISSN 0094-243X

Publisher:: AIPCopyright Statement

Country of Publication:: United States

Language:: English

References (9)

Measurement of the double- $β$ decay half-life of $^{136}$ Xe with the KamLAND-Zen experiment Gando, A.; Gando, Y.; Hanakago, H. Physical Review C, Vol. 85, Issue 4 https://doi.org/10.1103/PhysRevC.85.045504	journal	April 2012
Limit on Neutrinoless $β β$ Decay of ${}^{136}{Xe}$ from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in ${}^{76}{Ge}$ Gando, A.; Gando, Y.; Hanakago, H. Physical Review Letters, Vol. 110, Issue 6 https://doi.org/10.1103/PhysRevLett.110.062502	journal	February 2013
Geant4—a simulation toolkit Agostinelli, S.; Allison, J.; Amako, K. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8	journal	July 2003
Geant4 developments and applications Allison, J.; Amako, K.; Apostolakis, J. IEEE Transactions on Nuclear Science, Vol. 53, Issue 1 https://doi.org/10.1109/TNS.2006.869826	journal	February 2006
Production of radioactive isotopes through cosmic muon spallation in KamLAND Abe, S.; Enomoto, S.; Furuno, K. Physical Review C, Vol. 81, Issue 2 https://doi.org/10.1103/PhysRevC.81.025807	journal	February 2010
Limits on Majoron-emitting double- $β$ decays of $^{136}$ Xe in the KamLAND-Zen experiment Gando, A.; Gando, Y.; Hanakago, H. Physical Review C, Vol. 86, Issue 2 https://doi.org/10.1103/PhysRevC.86.021601	journal	August 2012
Improved measurement of the $2 ν β β$ half-life of $^{136}$ Xe with the EXO-200 detector Albert, J. B.; Auger, M.; Auty, D. J. Physical Review C, Vol. 89, Issue 1 https://doi.org/10.1103/PhysRevC.89.015502	journal	January 2014
Nuclear matrix elements for neutrinoless double-beta decay and double-electron capture Faessler, Amand; Rodin, Vadim; Šimkovic, Fedor Journal of Physics G: Nuclear and Particle Physics, Vol. 39, Issue 12 https://doi.org/10.1088/0954-3899/39/12/124006	journal	November 2012
The Evidence for the Observation of 0νββ Decay: the Identification of 0νββ Events from the full Spectra Klapdor-Kleingrothaus, H. V.; Krivosheina, I. V. Modern Physics Letters A, Vol. 21, Issue 20 https://doi.org/10.1142/S0217732306020937	journal	June 2006

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