Single-particle strength in neutron-rich ⁷¹Cu from the (d,³He) proton pick-up reaction

We have measured the ⁷²Zn(d,³He)⁷¹Cu proton pick-up reaction in inverse kinematics at 38 MeV/u. A dedicated set-up was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing ³He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions in the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the πf_5/2 orbital, the πf_7/2 singleparticle strength is not appreciably affected by the addition of neutrons beyond N = 40