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We consider the prospects for future ultrahigh energy cosmic ray and neutrinoobservations to constrain the evolution of sources producing a proton fluxabove 10 EeV (1 EeV = 10^18 eV). We find that strong constraints on the sourceevolution can be obtained by combining measurements of the cosmic ray protonfraction above 30 EeV with measurement of the neutrino flux at 1 EeV, ifneutrinos are predominantly of cosmogenic origin. In the case that interactionsin the source environment produce a significant astrophysical neutrino flux,constraints on the source evolution may require measurement of the observedproton fraction, as well as, the neutrino flux at multiple energies, such as 1EeV and 10 EeV. Finally, we show that fits to current UHECR data favor modelswhich result in a >30 EeV proton fraction and 1 EeV neutrino flux that couldrealistically be discovered by the next generation of experiments.

Prospects for joint cosmic ray and neutrino constraints on the evolution of trans-GZK proton sources