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Decaying topological defects, in particular cosmic strings, can produce asignificant flux of high energy neutrinos, photons and cosmic rays. Accordingto the prevailing understanding of cosmic string dynamics in an expandingUniverse, the network of long strings loses its energy first into string loops,which in turn give off most of their energy as gravitational radiation.However, it has been suggested by Vincent et al. (VHS) that particle emissionmay be the dominant energy loss channel for the long string network. In thiscase, the predicted flux of high energy particles would be much larger. Here wecalculate the predicted flux of high energy gamma rays, neutrinos and cosmicray antiprotons and protons as a function of the scale of symmetry breaking atwhich the strings are produced and as a function of the initial energy m_J ofthe particle jets which result from the string decay. Assuming the validity ofthe VHS scenario, we find that due to the interactions with the cosmicradiation backgrounds all fluxes but the neutrino flux are suppressed at thehighest energies. This indicates that the observed events above the GZK cutoffcan only be accounted for in this scenario if the primary particle is aneutrino and the scale of the symmetry breaking is somewhat less than the GUTscale. The domain of parameter space corresponding to GUT-scale symmetrybreaking is excluded also by the current observations below the GZK cutoff. Anew aspect of this work is the calculation of the spectrum of the tau neutrinosdirectly produced in the decay of the X-particles. This significantly increasesthe tau neutrino signal at high energies in all cosmic string scenarios.Comment: 21 pages, 9 figures. Rewritten and update

High energy neutrino, photon, and cosmic ray fluxes from VHS cosmic strings