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Resonances of Supernova Neutrinos in Twisting Magnetic Fields.
Phys Rev Lett
March 2024
Instituto de Física Gleb Wataghin - UNICAMP, 13083-859, Campinas, São Paulo, Brazil.
We investigate the effect of resonant spin conversion of the neutrinos induced by the geometrical phase in a twisting magnetic field. We find that the geometrical phase originating from the rotation of the transverse magnetic field along the neutrino trajectory can trigger a resonant spin conversion of Dirac neutrinos inside the supernova, even if there were no such transitions in the fixed-direction field case. We have shown that, even though resonant spin conversion is too weak to affect solar neutrinos, it could have a remarkable consequence on supernova neutronization bursts where very intense magnetic fields are quite likely.
View Article and Find Full Text PDFTime- and Space-Varying Neutrino Mass Matrix from Soft Topological Defects.
Phys Rev Lett
March 2023
Physics Department, Arizona State University, Tempe, Arizona 85287, USA.
We study the formation and evolution of topological defects that arise in the postrecombination phase transition predicted by the gravitational neutrino mass model in Dvali and Funcke [Phys. Rev. D 93, 113002 (2016)PRVDAQ2470-001010.
View Article and Find Full Text PDFNew Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs.
Phys Rev Lett
July 2022
Tritium Laboratory Karlsruhe (TLK), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
We report on the direct search for cosmic relic neutrinos using data acquired during the first two science campaigns of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the end point at 18.57 keV.
View Article and Find Full Text PDFCandidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino.
Phys Rev Lett
June 2022
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 234 Herzl Street 76100 Rehovot, Israel.
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE candidate, coincident with another high-energy neutrino.
View Article and Find Full Text PDFNew Constraints on Tau-Coupled Heavy Neutral Leptons with Masses m_{N}=280-970 MeV.
Phys Rev Lett
September 2021
Fermi National Accelerator Lab, Batavia, Illinois 60510, USA.
A search for heavy neutral leptons has been performed with the ArgoNeuT detector exposed to the NuMI neutrino beam at Fermilab. We search for the decay signature N→νμ^{+}μ^{-}, considering decays occurring both inside ArgoNeuT and in the upstream cavern. In the data, corresponding to an exposure to 1.
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