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Study of the p + ³H and n + ³He Final-State Interactions in the Reactions ⁷Li(p,α) and D(³He,p)


Lin, Wen Kuan (1969) Study of the p + ³H and n + ³He Final-State Interactions in the Reactions ⁷Li(p,α) and D(³He,p). Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/KPD0-CD06.


The ɑ-particle energy spectra from the bombardment of 7Li with 9.1-MeV protons have been obtained at 2.5° ≤ ϴɑ ≤ 120°. The high-energy ends of the spectra are interpreted as due to the 1S p + 3H final-state interaction through the first excited state of 4He at 20.06 MeV. The factored-wave-function method is used to deduce the resonance parameters of this state. Consistency in the use of this method is obtained by a PWBA calculation based on the triton-transfer mechanism to account for the forward-peaking in the angular distribution. Coincidence measurements between a-particles and the other charged particles give additional evidence for the 0+ assignment to the state, and indicate that the a + 3H and a + H final-state interactions are important as the 4He excitation energy gets higher. To reduce the effects of these final-state interactions, the reaction D(3He, p), at a 3He bombarding energy of 16.5 MeV, has been investigated. The protons emitted from the reaction have been measured at ϴp = 30° in coincidence with the other charged particles. Angular correlations have been obtained for 6.6 MeV ≤ Ep ≤ 8.6 MeV, and compared with a modified Born approximation calculation based on the stripping of 3He. The angle-energy correlation and the p - 3H to p - 3He branching ratio can be reproduced, if Meyerhof's p + 3H phase shifts and Bransden's n + 3He phase shifts are used to describe their respective interactions in the final states. In agreement with the reported 0- state at 21.2 MeV, the p-wave final-state interactions are found to be important in this energy range.

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):
  • Kavanagh, Ralph William (advisor)
  • Tombrello, Thomas A. (co-advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 May 1969
Funding AgencyGrant Number
Office of Naval ResearchUNSPECIFIED
Record Number:CaltechTHESIS:06082017-094850930
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10314
Deposited By: Benjamin Perez
Deposited On:23 Jun 2017 20:36
Last Modified:30 Jul 2021 23:25

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