Reduced Widths of Individual Nuclear Energy Levels

Abstract

BS>The theoretical prediction of widths of nuclear energy levels is discussed. The expressions for widths derived from the shell model and the strong coupling version of the Bohr-Mottelson mode are presented. The observed level widths of nuclei of mass number <40 were compiled and theoretically discussed. Reduced width amplitudes in terms of expansion coefficients and interpretations of the expansion coefficients with the shell model and the rotational model are discussed. Experimental values of reduced widths of resonance levels in light nuclei for normal and nonnormal parity states are given. These widths of unbound levels were obtained by measuring excitation curves of resonance reactions. Widths for bound levels were obtained from measurements of yields in stripping reactions or, in the case of photon channels, from Coulomb excitation. (M.C.G.)