Possibilities of proton capture spectroscopy in the fp shell

Abstract Thin-target yield curves have been measured for the 55 Mn(p, γ) 56 Fe and 55 Mn(p,n) 55 Fe reactions in the E p = 1420−1470 keV region. The three resonances at E p = 1441, 1446 and 1455 keV which show strong γ-ray ground-state transitions are interpreted as the fragmented analogue of the 56 Mn J π = 1 + second excited state. With Ge detectors at θ = 90° and 55° (with Compton suppression in the latter case) γ-ray spectra with good statistics have been measured at these resonances and at E p = 1435, 1452 and 1460 keV, which yield resonance branchings, branchings of 42 bound states (of which several were previously unobserved), accurate excitation energies ( ΔE x = 0.03−0.5 keV) of 51 bound states, J π restrictions for many levels, and the DSA lifetimes τ m = 14 ± 3 and 9 ± 4 fs for the strongly excited levels at E x = 4867 and 5023 keV, which can be regarded as fragments of the antianalogue configuration. The 55 Mn(p,γ) 56 Fe reaction energy has been measured as Q = 10183.84 ± 0.17 keV.