How can you physically hide the server from neutrons flying in from space, which are a common cause of spontaneous RAM errors?

Question

Physics

The question is not about ECC, but about how to physically hide the server from neutrons and other elementary particles that can cause spontaneous errors in RAM.

Answer 1

depends on energy
from the most energetic you can’t hide the earth through and through, they’ll sew through what your protection is for them,
and so a few meters of polyethylene or water
or corny dig deeper

Answer 2

Just like hiding a nuclear reactor on neutrons. It's absolutely the same.
Water, concrete, lead, and graphite rods.
PS Don't forget the tinfoil hat!