Abstract
The novel method of γ-ray induced Doppler broadening (GRID) after thermal neutron capture has been applied to measure the mean lives of the 1627, 1725 and 3428 keV states in 57Fe excited in the reaction 56Fe(n, γ). The lifetimes of these three and many other states in 57Fe have been determined using the 56Fe(d, p) reaction. From a comparison of the lifetime values obtained in both reactions the stopping power of slow 57Fe atoms ( E < 500 eV) recoiling in the Fe target has been checked. Furthermore, many new transitions have been assigned to 57Fe in the 56(d, p) reaction. Energies, mean lives and transition strengths in 57Fe have been compared with predictions of shell model calculations, involving 3p2h and 4p3h configurations.
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