| Institution: | (1) Department of Physics, Lund University, S-22100 Lund, Sweden;(2) School of Chemistry and Physics, Keele University, Keele, UK;(3) Physics Division, Argonne National Laboratory, 60439 Argonne, IL, USA;(4) Chemistry Department, Washington University, 63130 St. Louis, MO, USA;(5) Nuclear Science Division, Lawrence Berkeley National Laboratory, 94720 Berkeley, CA, USA |
| Abstract: | The doubly magic N = Z nucleus 56Ni has been investigated with two fusion-evaporation reactions; 40Ca(28Si, 3α)56Ni at a beam energy of 122MeV and 28Si(32S, 2p2n)56Ni at 130MeV. To detect γ-rays in coincidence with evaporated particles the Ge-detector array Gammasphere was used in conjunction
with the charged-particle detector system, Microball and a 1π neutron detector array. Results include a significantly extended
level scheme of 56Ni, which is compared to large-scale shell model calculations in the fp shell. The experimental and theoretical results agree to a large extent, with one notable exception; the theoretical model
fails to predict the proper sequence of the yrast and yrare 8+ states. |
