Analysis of the Intermediate Structure Observed in the Neutron Cross Section ofF19

Abstract
In measurements of the angular distribution and polarization of neutrons scattered from F19 at neutron energies between 0.2 and 2.2 MeV, resonances are observed to have widths that are larger than the widths usually associated with states of the compound nucleus but are considerably smaller than the widths of single-particle resonances. A phase-shift analysis of these data is shown to be consistent with the interpretation of this intermediate structure in terms of doorway states.