Level Structure and Spin Assignments in ⁷⁰Ga

Currently, little is known about high-spin states in odd-odd ⁷⁰Ga. However, a 9⁺ state was identified at 2887 keV, which could be the start of a high-spin rotational band based on a proton and neutron occupation of the g_9/2 orbital. The goal of this work was to search for evidence of this structure. The ⁷⁰Ga nuclei were produced following the ⁶²Ni(¹⁴C, αpn) reaction at 50 MeV performed at Florida State University. The γ decays were detected in coincidence with a Compton-suppressed Ge array consisting of three Clover detectors and seven single-crystal detectors. Spins were assigned from measured directional correlation of oriented nuclei (DCO) ratios and their comparison with theoretical values. A new high-spin band based on the 9⁺ state was observed and appears to show rotational character. The behavior of the moment-of-inertia of this band is similar to that of other odd-odd nuclei in this mass region, but the signature-splitting pattern indicates an irregular phase reversal at high spin.