d/u Extraction from F 2 n /F 2 p No 'free' neutron target (life time ~ 12 minutes) -- deuteron (or 3 He) used as 'effective' neutron target However, deuteron is a nucleus, F2d ≠ F2p + F2n Nuclear effects (nuclear binding, Fermi motion, shadowing) obscure neutron structure information -- 'nuclear EMC effect'
{}