Low spin structure of the N=Z odd-odd nucleus ₂₇⁵⁴Co₂₇

Low spin states in the odd-odd nucleus ⁵⁴Co were investigated with the ⁵⁴Fe(p,nγ)⁵⁴Co fusion evaporation reaction at the FN-TANDEM accelerator in Cologne. γγ-coincidences, γγ-angular correlations, and Compton asymmetries were measured. 28 low spin states were observed. 19 for the first time, eight new spin assignments and six new parity assignments were made, and seven γ-branching ratios were measured for the first time. M1 and E2 transition strengths between low-lying states in ⁵⁴Co were calculated in the shell-model framework. The experimental branching ratios and multipole mixing ratios indicate the existence of very strong isovector M1 transitions.