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Identifying the Milky Way's very high energy hadronic cosmic-ray accelerators-- the PeVatrons -- is a critical problem. While gamma-ray observations revealpromising candidate sources, neutrino detection is needed for certainty, andthis has not yet been successful. Why not? There are several possibilities, aswe delineated in a recent paper [T. Sudoh and J. F. Beacom, Phys. Rev. D 107,043002 (2023)]. Here we further explore the possibility that the challengesarise because PeVatrons have a large angular extent, either due to cosmic-raypropagation effects or due to clusters of sources. We show that while extendedneutrino sources could be missed in the commonly used muon-track channel, theycould be discovered in the all-flavor shower channel, which has a loweratmospheric-neutrino background flux per solid angle. Intrinsically, showersare quite directional and would appear so in water-based detectors like thefuture KM3NeT, even though they are presently badly smeared by light scatteringin ice-based detectors like IceCube. Our results motivate new shower-basedsearches as part of the comprehensive approach to identifying the Milky Way'shadronic PeVatrons.

Identifying Extended PeVatron Sources via Neutrino Shower Detection