I. A Λᵒ-Fragment Decay in a Cloud Chamber. II. Example of the Associated Production of a Ξ⁻ and Two θᵒ Particles. III. A Study of Multiple V-Events

Citation

Sorrels, John David (1956) I. A Λᵒ-Fragment Decay in a Cloud Chamber. II. Example of the Associated Production of a Ξ⁻ and Two θᵒ Particles. III. A Study of Multiple V-Events. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/72KQ-XZ56. https://resolver.caltech.edu/CaltechETD:etd-06292004-152135

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. A cloud chamber photograph of the decay in flight of a heavy nuclear fragment is described. The event is most reasonably interpreted as the decay of a [lambda] particle bound to a He3 nucleus, and is similar to examples previously observed in nuclear emulsions. Under this interpretation, the lifetime of the excited fragment in this single example is [...] sec and the binding energy of the [lambda] to He3 is probably less than 2 Mev. In another cloud chamber event, a negative cascade particle and two neutral heavy mesons appear to be produced in a single nuclear interaction above a cloud chamber. It is suggested that this event may be an example of the associated production of [...] particle with two [...] particles according to the scheme of Gell-Mann. All of the 48-inch magnet cloud chamber events where two or more V-particles appear to come from a single origin and decay in a single chamber are described. These V-events are analyzed for origin coplanarity and associated production. In the case of [...] production, a search for angular relationships between decay planes and the plane containing the lines of flight of the two [...] detects no strong correlations. Origin coplanarity tests do not indicate three body decay except in two cases of anomalous [...]. The data is consistent with the assumption of associated production of [...]. The role of the anomalous [...] in multiple production events is discussed.

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