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An Investigation of the Three-Body Reaction He³ (He³, 2p) He⁴


Bacher, Andrew Dow (1967) An Investigation of the Three-Body Reaction He³ (He³, 2p) He⁴. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/04XQ-B011.


Reactions produced by the He3 bombardment of the He3 have been investigated for bombarding energies from 1 to 20 MeV using a tandem Van de Graaff accelerator. Proton spectra from the three-body reaction He3(He3, 2p)He4 have been measured with a counter telescope at 13 angles for 9 bombarding energies between 3 and 18 MeV. The results are compared with a model for the reaction which includes a strong p-He4 final-state interaction. Alpha-particle spectra have been obtained at 12 and 18 MeV for forward angles with a magnetic spectrometer. These spectra indicate a strongly forward-peaked mechanism involving the 1S0 p-p interaction in addition to the p-He4 interaction. Measurements of p-He4 and p-p coincidence spectra at 10 MeV confirm these features of the reaction mechanism. Deuteron spectra from the reaction of He3(He3, d)pHe3 have been measured at 18 MeV. A triton spectrum from the reaction He3(He3, t)3p at 20 MeV and 40 is interpreted in terms of a sequential decay through an excited state of the alpha particle at 20.0 MeV. No effects are observed which would indicate an interaction in the residual (3p) system. Below 3 MeV the He3(He3, 2p)He4 reaction mechanism is observed to be changing and further measurements are suggested in view of the importance of this reaction in stellar interiors.

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):
  • Fowler, William A. (advisor)
  • Tombrello, Thomas A. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:2 December 1966
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Record Number:CaltechTHESIS:10262015-155317223
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9250
Deposited On:27 Oct 2015 23:00
Last Modified:11 Mar 2024 22:36

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