The gamma decay of g_9/2 and d_5/2 analogue resonances in ⁵⁷Co

An investigation of the gamma decay of the g_9/2 and d _5/2 analogue states in ⁵⁷Co has been performed using the ⁵⁶Fe(p,p' gamma ) and the ⁵⁶Fe(p, gamma )⁵⁷Co reactions. Excitation functions in the energy range E_p=3694-3855 keV reveal resonances at the energies E_p=3720, 3727, 3774 and 3793 keV. For the first two resonances their decay scheme along with angular distributions indicate that they are fragmented analogues of the E_x=2455 keV, J^pi=⁹/₂⁺ parent state in ⁵⁷Fe. The E_p=3774 and 3793 keV resonances are identified as the fragmented analogue resonances of the E_x=2506 keV, J ^pi=⁵/₂⁺ parent state in ⁵⁷Fe. The E_x=2611 and 4586 keV states in ⁵⁷Co are uniquely determined as ⁷/₂^- and ⁹/₂⁺ respectively.