Hello everyone, I am studying for an upcoming exam and have become somewhat confused as to exactly what geometric and material buckling represent. Are they representative of the shape of the neutron flux distribution in the reactor? Are these quantities related to the structural deformation of the fuel due to temperature gradients? As far as I have been able to determine, these quantities are useful to determine conditions for criticallity, but I would still like to understand them better, and all the copies of Stacey are checked out of the library! Any insights or explanations would be appreciated.