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Title: Precision measurement of the $$^{136}$$Xe two-neutrino $ββ$ spectrum in KamLAND-Zen and its impact on the quenching of nuclear matrix elements

Abstract

In this paper, we present a precision measurement of the $$^{136}$$Xe two-neutrino $$\beta\beta$$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino $$\beta\beta$$ rate allows us to measure the ratio of the leading and subleading $$2\nu\beta\beta$$ nuclear matrix elements (NMEs), $$\xi^{2\nu}_{31} = -0.26^{+0.31}_{-0.25}$$. 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 $$\xi^{2\nu}_{31}$$ range allowed by the QRPA is excluded by the present measurement at the 90%25 C.L. Our analysis reveals that predicted $$\xi^{2\nu}_{31}$$ values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Since these aspects are also at play in neutrinoless $$\beta\beta$$ decay, $$\xi^{2\nu}_{31}$$ provides new insights towards reliable neutrinoless $$\beta\beta$$ NMEs.

Authors:
 [1]
  1. Tohoku Univ., Sendai (Japan). et al.
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
KamLAND-Zen Collaboration
OSTI Identifier:
1512334
Alternate Identifier(s):
OSTI ID: 1506403
Grant/Contract Number:  
AC02-05CH11231; FG02-00ER41132
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 19; Other Information: https://journals.aps.org/prl/accepted/4b07aY3bN391686ba3e4671283538d15327411c8c; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Gando, A. Precision measurement of the $^{136}$Xe two-neutrino $ββ$ spectrum in KamLAND-Zen and its impact on the quenching of nuclear matrix elements. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.192501.
Gando, A. Precision measurement of the $^{136}$Xe two-neutrino $ββ$ spectrum in KamLAND-Zen and its impact on the quenching of nuclear matrix elements. United States. doi:10.1103/PhysRevLett.122.192501.
Gando, A. Mon . "Precision measurement of the $^{136}$Xe two-neutrino $ββ$ spectrum in KamLAND-Zen and its impact on the quenching of nuclear matrix elements". United States. doi:10.1103/PhysRevLett.122.192501.
@article{osti_1512334,
title = {Precision measurement of the $^{136}$Xe two-neutrino $ββ$ spectrum in KamLAND-Zen and its impact on the quenching of nuclear matrix elements},
author = {Gando, A.},
abstractNote = {In this paper, we present a precision measurement of the $^{136}$Xe two-neutrino $\beta\beta$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino $\beta\beta$ rate allows us to measure the ratio of the leading and subleading $2\nu\beta\beta$ nuclear matrix elements (NMEs), $\xi^{2\nu}_{31} = -0.26^{+0.31}_{-0.25}$. 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 $\xi^{2\nu}_{31}$ range allowed by the QRPA is excluded by the present measurement at the 90%25 C.L. Our analysis reveals that predicted $\xi^{2\nu}_{31}$ values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Since these aspects are also at play in neutrinoless $\beta\beta$ decay, $\xi^{2\nu}_{31}$ provides new insights towards reliable neutrinoless $\beta\beta$ NMEs.},
doi = {10.1103/PhysRevLett.122.192501},
journal = {Physical Review Letters},
number = 19,
volume = 122,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevLett.122.192501

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