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Hello, say I have a lattice as in

Q = RootSystem('E8').weight_lattice()

with it's canonical bilinear form. How do I find the vectors $v$ such that $(v,v)=n$ for a positive integer $n$?

Hello, say I have a lattice as in

Q = RootSystem('E8').weight_lattice()

with it's canonical bilinear form. How do I find the vectors $v$ such that $(v,v)=n$ for a positive integer $n$?$n$?

Edit: it would be even better if there's a way to get the points inside a cone, say the principal chamber in the above example.