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Study of the deformation-driving νd5/2νd5/2 orbital in 6728Ni39 using one-neutron transfer reactions

Abstract : The νg9/2,d5/2,s1/2νg9/2,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)(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 νg9/2νg9/2 (1007 keV) and νd5/2νd5/2 (2207 keV and 3277 keV) single-particle strengths up to an excitation energy of 5.8 MeV. 50% of the νd5/2νd5/2 single-particle strength relative to the νg9/2νg9/2-orbital is concentrated in and shared between the first two observed 5/2+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 g9/2g9/2 state, but differences are observed for the d5/2d5/2 single-particle strength.
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http://hal.in2p3.fr/in2p3-01066978
Contributor : Emilie Bonnardel <>
Submitted on : Monday, September 22, 2014 - 5:03:48 PM
Last modification on : Monday, November 16, 2020 - 12:54:04 PM

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J. Diriken, N. Patronis, A.N. Andreyev, S. Antalic, V. Bildstein, et al.. Study of the deformation-driving νd5/2νd5/2 orbital in 6728Ni39 using one-neutron transfer reactions. Physics Letters B, Elsevier, 2014, 736, pp.533-538. ⟨10.1016/j.physletb.2014.08.004⟩. ⟨in2p3-01066978⟩

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