학술논문
Study of the deformation-driving νd5/2 orbital in 6728Ni39 using one-neutron transfer reactions
Document Type
article
Author
J. Diriken; N. Patronis; A.N. Andreyev; S. Antalic; V. Bildstein; A. Blazhev; I.G. Darby; H. De Witte; J. Eberth; J. Elseviers; V.N. Fedosseev; F. Flavigny; Ch. Fransen; G. Georgiev; R. Gernhauser; H. Hess; M. Huyse; J. Jolie; Th. Kröll; R. Krücken; R. Lutter; B.A. Marsh; T. Mertzimekis; D. Muecher; F. Nowacki; R. Orlandi; A. Pakou; R. Raabe; G. Randisi; P. Reiter; T. Roger; M. Seidlitz; M. Seliverstov; K. Sieja; C. Sotty; H. Tornqvist; J. Van De Walle; P. Van Duppen; D. Voulot; N. Warr; F. Wenander; K. Wimmer
Source
Physics Letters B, Vol 736, Iss C, Pp 533-538 (2014)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
The νg9/2,d5/2,s1/2 orbitals are assumed to be responsible for the swift onset of collectivity observed in the region below 68Ni. Especially the single-particle energies and strengths of these orbitals are of importance. We studied such properties in the nearby 67Ni 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 γ-detection array and a newly-developed delayed-correlation technique as to investigate μs-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 νg9/2 (1007 keV) and νd5/2 (2207 keV and 3277 keV) single-particle strengths up to an excitation energy of 5.8 MeV. 50% of the νd5/2 single-particle strength relative to the νg9/2-orbital is concentrated in and shared between the first two observed 5/2+ levels. A comparison with extended Shell Model calculations and equivalent (3He, d) studies in the region around 9040Zr50 highlights similarities for the strength of the negative-parity pf and positive-parity g9/2 state, but differences are observed for the d5/2 single-particle strength.