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Double Charge Exchange of Pions on Helium-4


Ungar, Jeffrey Eugene (1983) Double Charge Exchange of Pions on Helium-4. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/QKDK-7G96.


The reaction 4He(π-π+) at an incident π- energy of 165 Mev has been measured at 0° in a search for bound states of the tetraneutron and resonant states in the continuum. No resonant structure was observed, and a cross section of 7 ± 15 nb/sr has been determined for bound tetraneutron production by this reaction. The measured cross section magnitudes are consistent with the related measurements of Falomkin et al and Stetz et al, but are larger than the results of Kaufman et al and the calculations of Gibbs et al by a factor of at least 100. The relevance of these results to identification of the pion double charge exchange reaction mechanism is discussed.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Applied Physics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • McKeown, Robert D.
Thesis Committee:
  • McKeown, Robert D. (chair)
  • Barnes, Charles A.
  • Corngold, Noel Robert
  • Johnson, William Lewis
  • Kavanagh, Ralph William
Defense Date:15 December 1982
Funding AgencyGrant Number
Gulf Oil CorporationUNSPECIFIED
Record Number:CaltechETD:etd-11032005-112918
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4389
Deposited By: Imported from ETD-db
Deposited On:03 Nov 2005
Last Modified:20 Dec 2019 19:32

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PDF (Ungar_je_1983.pdf) - Final Version
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