Aspen, April 19, 2007Tom Gaisser eV decade Breakout summary
Allard, Olinto, Parizot, astro-ph/ Alternatives for transition to E.G.
Aspen, April 19, 2007Tom Gaisser3 Model dependence of composition in galactic-extragalactic transition Allard, Olinto, Parizot, astro-ph/ proton model mixed model Model extragalactic component Subtract from observed to get galactic component
Aspen, April 19, 2007Tom Gaisser4 Berezhko & Völk arXiv: v1 [astro-ph] Model galactic component Subtract from observed to get extragalactic Transition predicted: to eV
Aspen, April 19, 2007Tom Gaisser5 Depth of Maximum Early transition favored –HiRes prototype + CASA/MIA –HiRes (E > ) G. Archbold, P. Sokolsky, et al., Proc. 28 th ICRC, Tsukuba, 2003 HiRes new composition result: transition occurs before ankle 0.3 EeV
Aspen, April 19, 2007Tom Gaisser6 Composition from density of muons ρ µ (600) vs. E 0 (Akeno, AGASA) From heavy toward protons Calculations by Bruce Dawson with MoccaSibyll
Aspen, April 19, 2007Tom Gaisser7 KASCADE-Grande : first analyses muon density investigations KASCADE-Grande preliminary T. Pierog (EPOS) MIA
Cross section summary M Block Note: old data are rescaled
Aspen, April 19, 2007Tom Gaisser9 Interaction models QGSjet01 SIBYLL QGSjet02 EPOS Ralph Engel
Aspen, April 19, 2007Tom Gaisser10
Hard 0 production of EPOS readily detectable in LHCf
More in EAS with EPOS Attribute to NN production in EPOS
Aspen, April 19, 2007Tom Gaisser13 Xmax more stable
Aspen, April 19, 2007Tom Gaisser14 Summary comments Two very different models of transition –10 17 to or to eV –Strong composition change signature –HiRes favors low-energy transition Model dependence a problem Good energy resolution important KASCADE-Grande, IceCube/IceTop, TALE, Amiga/HEAT at Auger