1. D. Seckel, Univ. of Delaware

2. Topics GZK neutrinos and UHECR spectrum (with TS)
Model degeneracy of UHECR
Simple scaling GZK-n calculations
Thoughts on HE interactions (Many)
Old Picture
New considerations (Scales, LPM, dE/dX)
Scaling dE/dX
Photonuclear
Pair Production
LPM issues
Line radiation
e,m,t at PeV, EeV, ZeV

3. Degeneracy of UHECR models
Flat spectrum, evolution, galactic contribution
Steep spectrum, no evolution, no galaxy

4. Simple scaling of GZK Spectrum: (Ep)-(1+g) Evolution (1+z)m
Matter dominated cosmology (1+z)-5/2
Spacing Dz = 0.5

5. Neutrinos break degeneracy
a) Flat spectrum, evolution, galactic contribution
b) Steep spectrum, no evolution, no galaxy
c) Cutoffs, Lambda…

6. Radio Event Topology: Old Picture I
5% in 3 km salt

7. Radio Event Topology: Old Picture II

8. New Considerations (dE/dX)

9. Scaling of dE/dX

10. Photonuclear review I Comments From DRSS 10-6 = 3km salt s?
y-distribution important

11. Photonuclear review II
b ~ L/(L+mlep)
<y> ~ L/(L+mlep)
Growth with g due to growth in photon cross-section (QCD) with E

12. Pair Production From LKV b ~ 1/mlep <y> ~ me/mlep ?
Quasi-continuous

13. Is reduction in seN-eNg sgN-Nee the whole story ? sgN (see S. Klein)
LPM issues
Is reduction in seN-eNg sgN-Nee the whole story ?
sgN (see S. Klein)
Convert energy to hadronic shower
seN-eNX ,(1019 eV?), seN-eNee (1020 eV (lpm?))

14. Line radiation (just like SLAC salt stack !?)
Showers vs radiation from a moving “charge”
Coherence region along track
Lumpy? L d

15. Expectations ne nm nt