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An Investigation of the Compound Nuclei ⁷Li and ⁷Be


Spiger, Robert John (1967) An Investigation of the Compound Nuclei ⁷Li and ⁷Be. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/75XC-EF29.


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 4He3He,p)6Li, 4He3He,p1)6Li*, 3H(α,n)6Li and 3H(α,n1)6Li*. 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 7-/2 and 5-/2 for the two lower levels in 7Li, confirms the 5-/2 assignment of the 7.47 level and suggests a 7-/2 assignment for the new level at 9.7 MeV. Similarly in 7Be, the assignment of 7-/2 and 5-/2 for the lower two levels is reconfirmed and an assignment of 7-/2 is suggested for the new level at 9.3 MeV. The reduced widths for α 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.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Tombrello, Thomas A.
Thesis Committee:
  • Unknown, Unknown
Defense Date:27 October 1966
Record Number:CaltechETD:etd-10042002-143530
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3898
Deposited By: Imported from ETD-db
Deposited On:07 Oct 2002
Last Modified:20 Mar 2024 21:02

Thesis Files

PDF (Spiger_RJ_1967.pdf) - Final Version
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