55Co Level Properties

Abstract

The decay of low-lying levels in 55Co has been studied by means of the 54Fe(d,nγ)55Co reaction. Neutron energies were determined by time-of-flight techniques using a pulsed incident beam and a large liquid scintillator. Gamma rays in coincidence with neutrons were detected by a Ge(Li) spectrometer. Three levels at 4 720.8 ± 0.6 4 747.1 ± 0.6 and 5 172.4 ± 0.6 keV were strongly populated. The 4 721 and 5 172 keV levels have earlier been identified as the isobaric analogues of the 55Fe ground state and first excited state. On the basis of a comparison of the present results with previous particletransfer reaction studies it is suggested that the ground state analogue is split into the 4 721 and 4 747 keV levels. A study of excitation functions of 54Fe(d,n) transitions at incident deuteron energies between 5.0 and 6.0 MeV shows that the spectroscopic strengths obtained from (d,n) experiments in this mass region at these energies depend strongly on the incident energy.