Résumé du preprint Irfu-15-72

Evolution of single-particle strength in neutron-rich 71Cu
P. Morfouace, S. Franchoo , K. Sieja , I. Matea , L. Nalpas, M. Niikura, A. Sanchez-Benitez, I. Stefan, M. Assié, F. Azaiez, D. Beaumel, S. Boissinot, C. Borcea, R. Borcea, G. Burgunder, L. Caceres, N. De Séréville, Z. Dombradi, J. Elseviers, B. Fernandez-Dominguez, A. Gillibert, S. Giron, S. Grévy, F. Hammache, O. Kamalou, V. Lapoux, L. Lefebvre, A. Lepailleur, C. Louchart, G. Marquinez-Duran, I. Martel-Bravo, A. Matta, D. Mengoni, D. Napoli, F. Recchia, J-A. Scarpaci, D. Sohler, O. Sorlin, M. Stanoiu, C. Stodel, J-C. Thomas and Z. Vajta
The strength functions of the $pi$f5/2,$pi$p3/2 and $pi$f7/2 orbitals in neutron-rich 71Cu were obtained in a 72Zn(d,3He)71Cu proton pickup reaction in inverse kinematics using a radioactive beam of 72Zn 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 with the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the $pi$f5/2 orbital and contrary to earlier interpretation, the $pi$f7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N = 40.