Properties of some bound states of the 56Fe nucleus excited by the 55Mn(p,γ)56Fe reaction

Radiative decay of 21 resonances in the Mn-55(p,gamma)Fe-56 reaction was studied in the proton beam energy region E-p = (1.3-1.8) MeV. Properties of bound states in the final Fe-56 nucleus have been deduced from accurately measured very complex gamma-ray spectra. About 150 levels have been firmly established for excitation energy up to approximate to 8 MeV and 93 of them have been observed for the first time or their established energy is substantially more accurate than in former publications or some other information is new. For each of the 57 levels, there has been established its decay and firmly observed at least one decay branch. Spin and parity have been newly determined or appreciated for 35 levels and for 35 levels the mean lifetime has been newly established by the DSAM method. Crude comparison of the observed level density with the statistical Fermi model prediction has been also performed.