The low excitation spectroscopy of 56, 57, 58Fe

Abstract

The lifetimes of 21 states in 58Fe up to an excitation energy of 4213 keV have been determined by means of the Doppler-shift attenuation method using the 55Mn(α, pγ) reaction. These results complement other experimental data in an analysis of the structures of the 56 57 58Fe nuclides. A shell-model study has also been carried out in which the protons are constrained to the f 7 2 shell while valence neutrons are restricted to the f 5 2-p 3 2-p 1 2 subgroup. Good agreement with most low excitation data is found, as well as with the triaxial rotor models for these nuclides. © 1978.