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- W147567488 abstract "We discuss the possible presence of Ultra Heavy (UH) (Z> 26) nuclei in the cosmic ray flux in the PeV-EeV region. Although there are no existing measurements of these nuclei in this energy region, there are suggestions that the UH nuclear flux could be 10−3 of the cosmic ray flux in this energy region. We discuss possible signatures of this flux in existing cosmic ray measurements, and describe future simulation work needed to translate these existing measurements into meaningful upper limits. Results from this simulation work will be presented at the Conference. 1. Science of UH nuclei in EHE cosmic ray region The canonical theoretical model of cosmic ray origin between 1 GeV and 1 PeV includes obtaining source material from supernova, acceleration of the material by multiple scattering in the shock wave generated by the expanding envelope of a supernova remnant (SNR) [3,5] and propagation through the interstellar medium to the observation point at Earth. This model naturally predicts a power law energy spectrum with the proper spectral index as well as the observed spectral cutoff above 100 TeV[11]. If the average propagation length continues to decrease above 100 TeV, the model predicts a heavy composition at the cutoff energy[12]. UH elements emerge from late stage evolution processes of stars, most notably through supernova r-process and s-process nucleosynthesis. Consequently, the relative fluxes of these nuclei are sensitive probes of elemental conditions during the supernova, and may well be affected by recently observed neutrino flavor oscillation. The presence of UH nuclei in the PeV-EeV cosmic ray flux therefore may provide strong evidence for GZK energy acceleration regions nearby UH nuclear sources such as supernova remnants.It should be noted that that TeV gamma ray observatories have yet to unambiguously observe TeV gamma rays in SNR due to pion production/decay from cosmic ray interactions with the ambient" @default.
- W147567488 created "2016-06-24" @default.
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- W147567488 date "2003-07-01" @default.
- W147567488 modified "2023-10-16" @default.
- W147567488 title "Characteristics of Ultra-Heavy Cosmic Ray Nuclei in the PeV-EeV Energy Region" @default.
- W147567488 hasPublicationYear "2003" @default.
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