Study of the deformation-driving d orbital in Ni using one-neutron transfer reactions

Diriken, J.*; Patronis, N.*; Andreyev, A. N.*; Antalic, S.*; Bildstein, V.*; Blazhev, A.*; Darby, I. G.*; De Witte, H.*; Eberth, J.*; Elseviers, J.*; Fedosseev, V. N.*; Flavigny, F.*; Fransen, Ch.*; Georgiev, G.*; Gernhuser, R.*; Hess, H.*; Huyse, M.*; Jolie, J.*; Krll, Th.*; Krcken, R.*; Lutter, R.*; Marsh, B. A.*; Mertzimekis, T.*; Mcher, D.*; Nowacki, F.*; Orlandi, R.  ; Pakou, A.*; Raabe, R.*; Randisi, G.*; Reiter, P.*; Roger, T.*; Seidlitz, M.*; Seliverstov, M.*; Sieja, K.*; Sotty, C.*; Tornqvist, H.*; Van De Walle, J.*; Van Duppen, P.*; Voulot, D.*; Warr, N.*; Wenander, F.*; Wimmer, K.*

The neutron orbits , d and s are assumed to be responsible for the swift onset of collectivity observed in the region below Ni. In order to gather information on the single-particle energies and spectroscopic factors of these orbitals, single-particle states in the nucleus Ni were populated using the reaction Ni(d,p), in inverse kinematics, at REX-ISOLDE, CERN. The new isotope was studied using combined particle- spectroscopy. Comparison with DWBA calculations, permitted the identification of positive parity states with a substantial amount of d (1007 keV) and d (2207 and 3277 keV) single-particle strength. Comparisons with extended Shell-Model calculations was also performed to confirm the single-particle nature of these states, and to deduce general properties around Ni.