Atkinson, M. C.Coloma, PilarMartinez-Soler, IvanRocco, NoemiShoemaker, Ian M.2022-05-022022-05-022022-04-28Journal of High Energy Physics. 2022 Apr 28;2022(4):174http://hdl.handle.net/10919/109779Abstract A variety of new physics scenarios allows for neutrinos to up-scatter into a heavy neutral lepton state. For a range of couplings and neutrino energies, the heavy neutrino may travel some distance before decaying to visible final states. When both the up-scattering and decay occur within the detector volume, these “double bang” events produce distinctive phenomenology with very low background. In this work, we first consider the current sensitivity at Super-Kamiokande via the atmospheric neutrino flux, and find current data may already provide new constraints. We then examine projected future sensitivity at DUNE and Hyper-Kamiokande, including both atmospheric and beam flux contributions to double-bang signals.application/pdfenCreative Commons Attribution 4.0 InternationalArticle - Refereed2022-05-01The Author(s)https://doi.org/10.1007/JHEP04(2022)174