Study of the deformation-driving nu d(5/2) orbital in Ni-67(28)39 using one-neutron transfer reactions

Publication Type
Journal Article
Year of Publication
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, C.
Georgiev, G.
Gernhauser, R.
Hess, H.
Huyse, M.
Krucken, R.
Lutter, R.
Marshi, B. A.
Mertzimekisl, T.
Muecher, 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.
de Walle, J. V.
Van Duppen, P.
Voulot, D.
Warr, N.
Wenander, F.
Wimmer, K.
Name of Publication
Physics Letters B
Date Published
Short Title
Study of the deformation-driving nu d(5/2) orbital in Ni-67(28)39 using one-neutron transfer reactions
Accession Number
ISBN Number

The nu g(9/2), d(5/2), s(1/2) orbitals are assumed to be responsible for the swift onset of collectivity observed in the region below Ni-68. Especially the single-particle energies and strengths of these orbitals are of importance. We studied such properties in the nearby Ni-67 nucleus, by performing a (d, p)-experiment in inverse kinematics employing a post-accelerated radioactive ion beam (RIB) at the REX-ISOLDE facility. The experiment was performed at an energy of 2.95 MeV/u using a combination of the T-REX particle detectors, the Miniball gamma-detection array and a newly-developed delayed-correlation technique as to investigate mu s-isomers. Angular distributions of the ground state and multiple excited states in 67Ni were obtained and compared with DWBA cross-section calculations, leading to the identification of positive-parity states with substantial nu g(9/2) (1007keV) and nu d(5/2) (2207 keV and 3277 keV) single-particle strengths up to an excitation energy of 5.8 MeV. 50% of the nu d(5/2) single-particle strength relative to the nu g(9/2)-orbital is concentrated in and shared between the first two observed 5/2(+) levels. A comparison with extended Shell Model calculations and equivalent (He-3, d) studies in the region around Zr-90(40)50 highlights similarities for the strength of the negative-parity pf and positive-parity g(9/2) state, but differences are observed for the d(5/2) single-particle strength. (C) 2014 The Authors. Published by Elsevier B.V.