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Search for a Sub-eV Sterile Neutrino Using Daya Bay's Full Dataset.
Phys Rev Lett
August 2024
Institute of High Energy Physics, Beijing.
This Letter presents results of a search for the mixing of a sub-eV sterile neutrino with three active neutrinos based on the full data sample of the Daya Bay Reactor Neutrino Experiment, collected during 3158 days of detector operation, which contains 5.55×10^{6} reactor ν[over ¯]_{e} candidates identified as inverse beta-decay interactions followed by neutron capture on gadolinium. The analysis benefits from a doubling of the statistics of our previous result and from improvements of several important systematic uncertainties.
View Article and Find Full Text PDFSearching for Two-Neutrino and Neutrinoless Double Beta Decay of ^{134}Xe with the PandaX-4T Experiment.
Phys Rev Lett
April 2024
School of Physics and Astronomy, Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
^{134}Xe is a candidate isotope for neutrinoless double beta decay (0νββ) search. In addition, the two-neutrino case (2νββ) allowed by the standard model of particle physics has not yet been observed. With the 656-kg natural xenon in the fiducial volume of the PandaX-4T detector, which contains 10.
View Article and Find Full Text PDFA series of high-sensitivity radon detection systems and their applications in nitrogen as well as the boil-off liquid nitrogen measurement.
Appl Radiat Isot
April 2024
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, 100871, China.
In modern rare-event search experiments such as neutrino experiments and dark matter search experiments, radon is one of the most important radiation backgrounds since it can emanate from nearly all the materials containing radium and migrate freely in the experiment system. To support the China Dark Matter Experiment (CDEX) at China Jinping Underground Laboratory (CJPL), a series of high-sensitivity radon detection systems with different electrostatic collection chambers were designed, and radon in nitrogen as well as boil-off liquid nitrogen was measured after accurate calibration and enrichment. Results showed that the calibration factors were 2.
View Article and Find Full Text PDFAn improved limit on the neutrinoless double-electron capture of Ar with GERDA.
Eur Phys J C Part Fields
January 2024
Article Synopsis
- The GERDA experiment used high-purity germanium detectors in a liquid argon cryostat to search for neutrinoless double-electron capture (0ECEC) involving argon, which could indicate new physics like lepton number violation.
- Over 4.34 years of data, including 3.08 years from Gerda Phase II, no signals were detected for this process.
- A 90% confidence level lower limit on the half-life of 0ECEC was established, meaning the process, if it exists, takes longer than the time frame of the experiment.
We report on a search for a heavy Majorana neutrino in the decays τ^{-}→π^{-}ν_{h}, ν_{h}→π^{±}ℓ^{∓}, ℓ=e, μ. The results are obtained using the full data sample of 988 fb^{-1} collected with the Belle detector at the KEKB asymmetric energy e^{+}e^{-} collider, which contains 912×10^{6} ττ pairs. We observe no significant signal and set 95% CL upper limits on the couplings of the heavy right-handed neutrinos to the conventional standard model left-handed neutrinos in the mass range 0.
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