Correspondence Between<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Transfer and Two-Proton and Two-Neutron Transfer Reactions to the Nickel Isotopes

Abstract

The ($^{6}\mathrm{Li}, d$) reaction has been measured at 34-MeV incident energy from targets of $^{54}\mathrm{Fe}$, $^{56}\mathrm{Fe}$, and $^{58}\mathrm{Fe}$ using a $Q3D$ spectrograph. A close correspondence is found between the ($^{6}\mathrm{Li}, d$) spectra and previous ($t, p$) and ($^{3}\mathrm{He}, n$) results for the same final nuclei. The ${0}^{+}$ proton-pairing vibration states in $^{58}\mathrm{Ni}$ and $^{60}\mathrm{Ni}$ are strongly excited, and the pairing vibration is identified for the first time at 3.519 MeV in $^{62}\mathrm{Ni}$ based on ($^{6}\mathrm{Li}, d$). The remainder of the levels in $^{60}\mathrm{Ni}$ and $^{62}\mathrm{Ni}$ follow closely the ($t, p$) patterns of excitation.