An analysis of cross section fluctuations in the reaction 55Mn(p,p)55Mn

The fluctuations in the cross sections of the reactions 55mn(p,p) and 55Mn(p,p') were studied for protons with bombarding energies from 4.240 MeV to 6.070 MeV. The cross sections of proton groups leading to the ground and also to the sixth excited states of 55Mn were analyzed on the basis of various correlation functions of the statistical theory and compared with statistical model predictions. Contributions of the direct reaction were estimated from the variance on the fluctuating cross sections, and from an analysis of energy-averaged angular distributions by means of the Hauser-Feshbach estimates. The sixth excited state at 2.199 MeV was assigned to 5/2- or 7/2- as the most probable spin-parity. (auth.)