One-neutron knockout from Ni57

Abstract

The single-particle structure of Ni57 and level structure of Ni56 were investigated with the Be9 (Ni57,Ni56+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 Ni56 were deduced. © 2006 The American Physical Society.