Since neutrons don't have an electric charge, they are hard to deflect. Neutrons are really only deflected by head on collisions with an atomic nucleus whereas

Since neutrons don't have an electric charge, they are hard to deflect. Neutrons are really only deflected by head on collisions with an atomic nucleus whereas charged particles are deflected by a near miss due to the electromagnetic force. Shielding from neutron radiation usually involves thick and heavy layers of lead.