Reactor On-Off Antineutrino Measurement with KamLAND

By The KamLAND Collaboration. 2013

304 citations recorded by the source corpus.

The recent long-term shutdown of Japanese nuclear reactors has resulted in a significantly reduced reactor ν¯e flux at KamLAND. This running condition provides a unique opportunity to confirm and constrain backgrounds for the reactor ν¯e oscillation analysis. The data set also has improved sensitivity for other ν¯e signals, in particular ν¯e’s produced in β-decays from U238 and Th232 within the Earth’s interior, whose energy spectrum overlaps with that of reactor ν¯e’s. Including constraints on θ13 from accelerator and short-baseline reactor neutrino experiments, a combined three-flavor analysis of solar and KamLAND data gives fit values for the oscillation parameters of tan2θ12=0.436+0.029−0.025, Δm221=7.53+0.18−0.18×10−5 eV2, and sin2θ13=0.023+0.002−0.002. Assuming a chondritic Th/U mass ratio, we obtain 116+28−27 ν¯e events from U238 and Th232, corresponding to a geo ν¯e flux of 3.4+0.8−0.8×106 cm−2 s−1 at the KamLAND location. We evaluate various bulk silicate Earth composition models using the observed geo ν¯e rate.

Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f43df55281e68ec9c4dbafd30c7967daf81e32f9

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Citations in the corpus

2020 global reassessment of the neutrino oscillation picture (2020, methodology): “[45] KamLAND Collaboration, A.”
Global analysis of three-flavour neutrino oscillations: synergies and tensions in the determination of θ23, δCP, and the mass ordering (2018, background): “Reactor experiments • KamLAND separate DS1, DS2, DS3 spectra [69] with Daya Bay reactor ν fluxes [25], 69 data points.”
The fate of hints: updated global analysis of three-flavor neutrino oscillations (2020, background): “• KamLAND separate DS1, DS2, DS3 spectra [51] with Daya-Bay reactor ν fluxes [52], 69 data points.”
Neutrino masses and mixings: Status of known and unknown 3ν parameters (2016, methodology): “We remark that the latest published KL data [21] are divided into three subsets, with correlated systematics that are difficult to implement outside the Collaboration.”
JUNO physics and detector (2021, background): “Only two experiments have measured geoneutrinos so far: KamLAND [105, 106, 107, 108, 109] and Borexino [110, 111, 112, 113].”
Flavor structures of charged fermions and massive neutrinos (2019, unknown): “[415, 416].”
Theia: an advanced optical neutrino detector (2019, background): “Ongoing observations at underground sites in Japan [101] and Italy [102] record the energies, but not the directions, of geo-neutrinos from uranium and”