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Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements.

Publication ,  Journal Article
Gando, A; Gando, Y; Hachiya, T; Ha Minh, M; Hayashida, S; Honda, Y; Hosokawa, K; Ikeda, H; Inoue, K; Ishidoshiro, K; Kamei, Y; Kamizawa, K ...
Published in: Physical review letters
May 2019

We present a precision analysis of the ^{136}Xe two-neutrino ββ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino ββ rate allows us to measure the ratio of the leading and subleading 2νββ nuclear matrix elements (NMEs), ξ_{31}^{2ν}=-0.26_{-0.25}^{+0.31}. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the ξ_{31}^{2ν} range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ξ_{31}^{2ν} values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Because these aspects are also at play in neutrinoless ββ decay, ξ_{31}^{2ν} provides new insights toward reliable neutrinoless ββ NMEs.

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Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

May 2019

Volume

122

Issue

19

Start / End Page

192501

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

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Gando, A., Gando, Y., Hachiya, T., Ha Minh, M., Hayashida, S., Honda, Y., … KamLAND-Zen Collaboration, . (2019). Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements. Physical Review Letters, 122(19), 192501. https://doi.org/10.1103/physrevlett.122.192501
Gando, A., Y. Gando, T. Hachiya, M. Ha Minh, S. Hayashida, Y. Honda, K. Hosokawa, et al. “Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements.Physical Review Letters 122, no. 19 (May 2019): 192501. https://doi.org/10.1103/physrevlett.122.192501.
Gando A, Gando Y, Hachiya T, Ha Minh M, Hayashida S, Honda Y, et al. Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements. Physical review letters. 2019 May;122(19):192501.
Gando, A., et al. “Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements.Physical Review Letters, vol. 122, no. 19, May 2019, p. 192501. Epmc, doi:10.1103/physrevlett.122.192501.
Gando A, Gando Y, Hachiya T, Ha Minh M, Hayashida S, Honda Y, Hosokawa K, Ikeda H, Inoue K, Ishidoshiro K, Kamei Y, Kamizawa K, Kinoshita T, Koga M, Matsuda S, Mitsui T, Nakamura K, Ono A, Ota N, Otsuka S, Ozaki H, Shibukawa Y, Shimizu I, Shirahata Y, Shirai J, Sato T, Soma K, Suzuki A, Takeuchi A, Tamae K, Ueshima K, Watanabe H, Chernyak D, Kozlov A, Obara S, Yoshida S, Takemoto Y, Umehara S, Fushimi K, Hirata S, Berger BE, Fujikawa BK, Learned JG, Maricic J, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, O’Donnell T, Detwiler JA, Enomoto S, Decowski MP, Menéndez J, Dvornický R, Šimkovic F, KamLAND-Zen Collaboration. Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements. Physical review letters. 2019 May;122(19):192501.

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

May 2019

Volume

122

Issue

19

Start / End Page

192501

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences