Using the non-observation of ultrahigh-energy neutrinos at the Pierre Auger Observatory, the collaboration sets 90% confidence limits on the active-sterile transition magnetic moment for sterile neutrino masses between 1 and 100 TeV.
Testing hadronic and photo-hadronic interactions as responsible for UHECR and neutrino fluxes from Starburst Galaxies
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abstract
We test the hypothesis of starburst galaxies as sources of ultra-high energy cosmic rays and high-energy neutrinos. The computation of interactions of ultra-high energy cosmic rays in the starburst environment as well as in the propagation to the Earth is made using a modified version of the Monte Carlo code {\it SimProp}, where hadronic processes in the environment of sources are implemented for the first time. Taking into account a star-formation-rate distribution of sources, the fluxes of ultra-high energy cosmic rays and high-energy neutrinos are computed and compared with observations, and the explored parameter space for the source characteristics is discussed. We find that, depending on the density of the gas in the source environment, spallation reactions could exceed theoutcome in neutrinos from photo-hadronic interactions in the source environment and in the extra-galactic space.
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Search for active-sterile neutrino transitions using Pierre Auger Observatory data
Using the non-observation of ultrahigh-energy neutrinos at the Pierre Auger Observatory, the collaboration sets 90% confidence limits on the active-sterile transition magnetic moment for sterile neutrino masses between 1 and 100 TeV.