A Study of the Compound Nucleus ⁷Be

Citation

Harrison, William Douglas (1966) A Study of the Compound Nucleus ⁷Be. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/KVHX-KV55. https://resolver.caltech.edu/CaltechETD:etd-09172002-144235

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Measurements were made of the differential cross section for the [...](2.184 MeV) and [...](3.562 MeV) reactions, of both the differential and the total cross section for the [...](3.562 MeV) reaction, and of the total cross section for the [....] reaction. The ranges of incident particle laboratory energies were from 2.4 to 12.0 MeV, 3.6 to 9.4 MeV, 4.3 to 9.4 MeV, and 13.8 to 18.4 MeV respectively. Other measurements were made to determine the consistent relative normalization of these data and the data obtained by other investigators on [Beryllium-7]-forming reactions, and to determine the correct overall absolute normalization. The [...] data indicate the existence of a broad state at about 10-MeV excitation energy in [Beryllium-7] and the possible existence of extremely broad structure at roughly 13 MeV, but do not support the existence of a proposed state at 14.6 MeV. The [...] data indicate that the broad state is located at about 10.0 MeV and has a width of about 1.8 MeV. This is consistent with the [...] and [...] data. These data exhibit an interference-like feature, which has been associated with the existence of another [Beryllium-7] state located at about 11.0 MeV and with a total width of about 0.4 MeV. On the basis of an analysis with complex eigenvalue resonance theory the assignments [...] for both the 10.0- and the 11.0-MeV states have been made, and the existence of an extremely broad [...] state at roughly 10 MeV or higher has been suggested. The isotopic spin assignments [T=1/2] for the 10.0-MeV 2 state and [T=3/2] for the 11.0-MeV state have been made. Possible values for some of the partial widths, the results of other experiments, and the evidence relating to the usefulness of different versions of complex eigenvalue theory are discussed.

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