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The momentum distribution of $^{11}$Be fragments produced by the breakup of$^{12}$Be interacting with a proton target at 700.5 MeV/$u$ energy has beenmeasured at GSI Darmstadt. To obtain the structure information on the anomalyof the $N=8$ neutron shell, the momentum distribution of $^{11}$Be fragmentsfrom the one-neutron knockout $^{12}$Be(p,pn) reaction, measured in inversekinematics, has been analysed in the distorted wave impulse approximation(DWIA) based on a quasi-free scattering scenario. The DWIA analysis shows asurprisingly strong contribution of the neutron $0d_{5/2}$ orbital in $^{12}$Beto the transverse momentum distribution of the $^{11}$Be fragments. Thesingle-neutron $0d_{5/2}$ spectroscopic factor deduced from the presentknock-out data is 1.39(10), which is significantly larger than that deducedrecently from data of $^{12}$Be breakup on a carbon target. This resultprovides a strong experimental evidence for the dominance of the neutron$\nu(0d_{5/2})^2$ configuration in the ground state of $^{12}$Be.

physics letters b

The dominance of the $\nu(0d_{5/2})^2$ configuration in the $N=8$ shell  in $^{12}$Be from the breakup reaction on a proton target at intermediate  energy