In-beam spectroscopic technique using the fusion evaporation reaction ${}^{52}\mathrm{Cr}({}^{18}\mathrm{O},1p3n)$, at a beam energy of 72.5 MeV, was employed to explore the structural phenomena in ${}^{66}\mathrm{Ga}$, mainly at intermediate and high spins. The experimental setup involved an array of 14 Compton suppressed Ge clover detectors, placed around the target position to detect emitted $\gamma$ rays from excited states. A new level scheme has been proposed, which is enriched with more than 20 new transitions and is extended up to an excitation energy $\approx 12$ MeV. A few observed intermediate spin states of ${}^{66}\mathrm{Ga}$ are discussed in the framework of coupling of single-particle configurations with the vibrational core of ${}^{64}\mathrm{Zn}$. Shell model calculations have also been performed with two different interactions, viz., jj44bpn and jun45pn, for the interpretation of the observed level structure in ${}^{66}\mathrm{Ga}$.

• Received 23 November 2019
• Revised 5 July 2020
• Accepted 29 July 2020

DOI:https://doi.org/10.1103/PhysRevC.102.024328