Graduate Why Can't We Detect Cosmic Rays Beyond the GZK Limit?

[Zuzana]

Hello,
I would like to ask, why there cannot be detected cosmic rays with energies higher than ~ 10^20 eV, i.e. beyond the GZK limit?

Thanks a lot in advance for the answer.

 

[Vanadium 50]

What have you found out? For example, did you look on Wikipedia? What was hard to understand?

 

[Zuzana]

I do not understand why proton with energy > 50 EeV cannot interact with CMB, because there is a cosmic ray paradox and one of possible explanations is that neutrino and antineutrino interacts and create hadrons with extreme energies, is there for these extreme-energy CRs interaction with CMB or not?

 

[Vanadium 50]

That may be the longest sentence I have read in a while. I have a hard time parsing it, but you seem to have the sign of the limit backwards. High energy particles do interact with the CMB.