Structure of 12Be: intruder d-wave strength at N=8
  The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the 0 hbar omega neutron p1/2-orbital and the 1 hbar omega, neutron d5/2 intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be. 
S. D. Pain (1), W. N. Catford (1 and 2), N. A. Orr (2), J. C.   Angelique (2), N. I. Ashwood (3), V. Bouchat (4), N. M. Clar...