Experimental study of the 66Ni(d, p)67Ni one-neutron transfer reaction

Phys. Rev. C

91
054321
(2015)
J. Diriken, N. Patronis, A. 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. Gernhäuser, H. Hess, M. Huyse, J. Jolie, Th. Kröll, R. Krücken, R. Lutter, B. A. Marsh, T. Mertzimekis, D. Mücher, R. Orlandi, A. Pakou, R. Raabe, G. Randisi, P. Reiter, T. Roger, M. Seidlitz, M. Seliverstov, C. Sotty, H. Tornqvist, J. Van De Walle, P. Van Duppen, D. Voulot, N. Warr, F. Wenander and K. Wimmer

The quasi-SU(3) sequence of the positive parity 𝜈⁢𝑔9/2,𝑑5/2,𝑠1/2 orbitals above the 𝑁=40 shell gap are assumed to induce strong quadrupole collectivity in the neutron-rich Fe (𝑍=26) and Cr (𝑍=24) isotopes below the nickel region. In this paper the position and strength of these single-particle orbitals are characterized in the neighborhood of  
68
 Ni 
  (𝑍=28, 𝑁=40) through the  
66
 Ni 
 ⁢(𝑑,𝑝)⁢ 
67
 Ni 
  one-neutron transfer reaction at 2.95 MeV/nucleon in inverse kinematics, performed at the REX-ISOLDE facility in CERN. A combination of the Miniball 𝛾-array and T-REX particle-detection setup was used and a delayed coincidence technique was employed to investigate the 13.3-𝜇⁢s isomer at 1007 keV in  
67
 Ni 
 . Excited states up to an excitation energy of 5.8 MeV have been populated. Feeding of the 𝜈⁢𝑔9/2 (1007 keV) and 𝜈⁢𝑑5/2 (2207 keV and 3277 keV) positive-parity neutron states and negative parity (𝜈⁢𝑝⁢𝑓) states have been observed at low excitation energy. The extracted relative spectroscopic factors, based on a distorted-wave Born approximation analysis, show that the 𝜈⁢𝑑5/2 single-particle strength is mostly split over these two excited states. The results are also compared to the distribution of the proton single-particle strength in the  
90
 Zr 
  region (𝑍=40,𝑁=50).

DOI
10.1103/PhysRevC.91.054321
Published on
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