Abstract
An investigation of the gamma decay of the g9/2 and d5/2 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 Ep=3694-3855 keV reveal resonances at the energies Ep=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 Ex=2455 keV, Jpi =9/2+ parent state in 57Fe. The Ep=3774 and 3793 keV resonances are identified as the fragmented analogue resonances of the Ex=2506 keV, Jpi =5/2+ parent state in 57Fe. The Ex=2611 and 4586 keV states in 57Co are uniquely determined as 7/2- and 9/2+ respectively.
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