Production of Hyperfragments from the Interactions of 800-MeV/cK−Mesons with Emulsion Nuclei
Abstract
A study has been made of the production of hyperfragments by the interactions of 800-MeV/c ${K}^{\ensuremath{-}}$ mesons in nuclear emulsion. The frequency of production, estimated to be 5.3\ifmmode\pm\else\textpm\fi{}0.3%, is about the same as for ${K}^{\ensuremath{-}}$ mesons at rest. The hyperfragments are emitted predominantly in the forward direction and the ratio of nonmesonic to mesonic decays has been found to be 11.5\ifmmode\pm\else\textpm\fi{}0.6, much greater than for ${K}^{\ensuremath{-}}$ mesons at rest. The proportion of hyperfragments of short range (range in emulsion 5 \ensuremath{\mu}) is also much greater. These and other observations indicate that the hyperfragments are heavier than those produced by ${K}^{\ensuremath{-}}$ mesons at rest. In at least 65\ifmmode\pm\else\textpm\fi{}4% of cases they come from heavy emulsion nuclei, in contrast to the situation for $K$ mesons at rest where most hyperfragments appear to originate in light emulsion nuclei. A model is proposed which can account for many of the features of the hyperfragment production process.
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