An investigation of the compound nuclei 7Li and 7Be

Citation

Spiger, Robert John (1967) An investigation of the compound nuclei 7Li and 7Be. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-10042002-143530

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The differential elastic scattering cross section has been measured for the scattermg of [3He] from [4He] and the scattering of [4He] from tritium. Incident particle energies of 5 to 18 MeV and 4 to 18 MeV, respectively, were used. Gas targets were used and solid state silicon detectors were employed to detect the scattered particles. Data were also obtained for the reactions [...], [...], [...] and [...]. Levels are seen at 4.65, 6.64, 7.47 and 9.7 MeV in [7Li] and at 4.57, 6.73, 7.21 and 9.3 MeV in [7Be]. A phase shift analysis suggests assignments of [...] and [...] for the two lower levels in [7Li], confirms the [...] assignment of the 7.47 level and suggests a [...] assignment for the new level at 9.7 MeV. Similarly in [7Be], the assignment of [...] and [...] for the lower two levels is reconfirmed and an assignment of [...] is suggested for the new level at 9.3 MeV. The reduced widths for [alpha] and nucleon emission were determined by fitting the phase shifts near each level with a single and/or double level formula from the R-matrix formalism of Lane and Thomas (1958). The results of the analysis are discussed and compared with predictions of some recent nuclear model calculations.

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