Abstract
The (α, d) reaction has been investigated at bombarding energies around 55 MeV on 40,42,44,48Ca, 50,52,54Cr, 54,56,58Fe, 58,60,62,64Ni, 64,66Zn and 70,72Ge targets. The angular distributions of prominent transitions were analyzed with the distorted-wave Born approximation and shown to correspond to unnatural-parity stretched proton-neutron configurations. Strong transitions of ( g 9 2 ) 2 9 + and ( p 3 2 , g 9 2 ) 6− character were identified in most final nuclei. Additionally, dominant transitions with ( f 7 2 , g 9 2 ) 8− structure were observed for target nuclei with an open proton ( f 7 2 shell. These stretched high-spin states could be consistently described by an average normalization constant N = 225 ± 85 indicating their relatively pure two-nucleon structure. In the lower-mass Sc and Mn isotopes, configurations built on g 9 2 states are increasingly damped because of the strong fragmentation of the underlying single-particle strength.
Published Version
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