Abstract
Ericson fluctuations in the differential cross sections were investigated for the compound reactions , , , , and . Level widths in the compound nuclei , , , and were extracted from the analysis of the differential cross sections by the Fourier method and a nonlinear fit to the distribution. The neutron spectra for each reaction were measured at least at three backward angles but the coherence width did not show a strong angular dependence. Nuclear level densities for the above nuclei were extracted by relating the average level spacing to the average level width using the fluctuation theory. Reasonable agreements were found with other level densities and level density compilations based in the Fermi gas formalism of Al-Quraishi and Huang for , , and but the comparison diverges for for which additional measurements are required in order to clarify the observed discrepancies. The level density parameters that best describe the data are and , , for , and , , for , and and , , for .
9 More- Received 4 March 2004
DOI:https://doi.org/10.1103/PhysRevC.70.024311
©2004 American Physical Society