Abstract
Intruder configurations in the ground state of 30Ne were studied using the one neutron knockout reaction 12C(30Ne,29Ne + γ)X at 228 MeV/nucleon at the Radioactive Isotope Beam Factory. Individual parallel momentum distributions and partial cross sections were measured by tagging γ rays. A significant population of the p-wave intruder state in 29Ne is observed, providing further experimental evidence for the vanishing of the N = 20 shell closure.