High-resolution measurements of analogue states in 57Co

Using a proton beam with an overall resolution of 300–400 eV (FWHM) spins, parities and partial widths were determined for all resonances observed (99 s-wave, 42 p-wave, 106 d-wave and one g-wave resonances). Differential cross sections for proton elastic scattering from ⁵⁶Fe were measured at proton energies between 3.1 and 4.2 MeV. Spectroscopic factors and Coulomb displacement energies were extracted for the fragmented analogue resonances which correspond to the $\text{5}\text{2}{}^{\mathrm{+}}\text{(2.506}\text{MeV}\text{)}$, $\text{3}\text{2}{}^{\mathrm{+}}\text{(2.565}\text{MeV}\text{)}$ and $\text{1}\text{2}{}^{\mathrm{?}}\text{(2.687}\text{MeV}\text{)}$ states in ⁵⁷Fe. A value of the s-wave proton strength function was deduced.