The single-particle structure of 57Ni and level structure of 56Ni were investigated with the \mbox{9Be (57Ni,56Ni+γ)X} reaction at 73 MeV/nucleon. An inclusive cross section of 41.4(12) mb was obtained for the reaction, compared to a theoretical prediction of 85.4 mb, hence only 48(2)% of the theoretical cross section is exhausted. This reduction in the observed spectroscopic strength is consistent with that found for lighter well-bound nuclei. One-neutron removal spectroscopic factors of 0.58(11) to the ground state and 3.7(2) to all excited states of 56Ni were deduced.
@article{arxiv.nucl-ex/0606030,
title = {One-neutron knockout from $^{57}$Ni},
author = {K. L. Yurkewicz and D. Bazin and B. A. Brown and J. Enders and A. Gade and T. Glasmacher and P. G. Hansen and V. Maddalena and A. Navin and B. M. Sherrill and J. A. Tostevin},
journal= {arXiv preprint arXiv:nucl-ex/0606030},
year = {2008}
}