Neutron spectroscopy. Progress report, July 1, 1975--September 30, 1976

Abstract

During 1975 -76 several experiments were performed at ORELA. The single fragment kinetic energy measurements on 235 U were continued and a run on 229 Th was added. Coincident double energy measurements were started both on 235 U and 229 Th. Mass and total kinetic energy distributions have been calculated. The data which have been analyzed,up to date show similar, but more complex effects than reported earlier. Cross Sections of 229 Th have been determined and many new levels discovered. A new computer program has been written to analyze the saturated resonances in capture cross section measurements. Calculations on the bias introduced in fission cross section measurements using, ionization chambers have been concluded. The calculational program started last year with the objective of determining the contribution of neutron scattering by the iron pole pieces of the Nevis synchrocyclotron to the observed backgrounds has been continued. "This report was prepared as an account of Government^sponsored work. Neither the United States, nor the Energy Research and Development Administration, nor any person acting on behalf of the Administration:A. Makes any warranty or representation, expressed or implied, with respect to the accuracy, completeness., or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of, any information, apparatus, method, or process disclosed in this report.As used in the above, 'person acting on behalf of the Administration' includes any employee or contractor of the Administration, or employee of such contractor, to the extent that such employee or contractor of the Administration, or employee of such contractor prepares, disseminates, or provides access toV and information pursuant to his employment or contract with the Administration, or his employment with such contractor."