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Magnetic Analysis of Reactions Leading to Excited States in Li⁶ and B¹¹


Groce, David Eiben (1963) Magnetic Analysis of Reactions Leading to Excited States in Li⁶ and B¹¹. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/47VK-VR77.


A double-focusing magnetic spectrometer of 24-inch radius has been installed at the California Institute of Technology for use with the ONR Tandem Van de Graaff accelerator. The design, alignment, and testing of this instrument is described, and the performance is compared with the theoretical design predictions. A Be^9 (p,α)Li^(6*) reaction was investigated with this spectrometer. Excited states in Li^6 were seen at 2.19-, 3.57-, 4.50-, and 5.36-Me V, confirming previous work. Intense alpha particle background from the breakup of Li^(6*) Be^8, and Be^(9*) limit the information that can be obtained from the alpha particle spectrum. The Be^9(He^3 ,p)B^(11*) and B^(10) (d,p)B^(11*) reactions were used to investigate the excited states in B^(11). All known states between 8.9- and 15. 0-Me V excitation were observed except for states at 11.0- and 14.0-MeV excitation. In addition, two new states were found at 11.27- and 12.57-MeV excitation. It is believed that the 11.27-MeV state has isotopic spin T = 1/2 and that the 12.57-MeV state has isotopic spin T = 3/2.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Electrical Engineering) ; 24-inch Magnetic Spectrometer, Tandem Van de Graaff Accelerator
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Electrical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Whaling, Ward
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1963
Non-Caltech Author Email:groce (AT)
Record Number:CaltechTHESIS:03022012-092419097
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6843
Deposited On:02 Mar 2012 17:54
Last Modified:08 Jan 2024 19:39

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