Summary
Details are given of six hyperon events observed in photographic emulsions. Two of these decay at rest into protons and giveQ-values of 115.8±1.0 MeV and 113.5±1.7 MeV for the assumed decay scheme: Y+ → p+π0+Q. Three others decay in flight; two giveQ-values 115±7 MeV and 103±10.5 MeV for the decay mode: Y± → n+π±+Q; the third is in agreement with the cascade type of decay: Y− → A0+π−+Q and has aQ=59±11 MeV. The sixth event has been interpreted as the interaction at rest of a negative hyperon; from the parent star of this hyperon there also emerges a K-meson.
Riassunto
Si descrivono in dettaglio sei iperoni osservati in emulsioni fotografiche. Due di di essi decadono a riposo in protoni e danno perQ valori di 115,8 ± 1,0 MeV e 113,5±1,7 MeV per il presunto schema di decadimento Y+ → p+π0+Q. Tre altri decadono in volo: due danno perQ valori di 115±7 MeV e 103±10,5 MeV per lo schema di decadimento Y± → n+π±+Q: il terzo si accorda col tipo di decadimento in cascata: Y− → A0+π−+Q e ha unQ=59±11 MeV. Il sesto evento è stato interpretato come l’interazione a riposo di un iperone negativo; dalla stella da cui origina questo iperone emerge anche un mesone K.
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Friedlander, M.W., Keefe, D. & Menon, M.G.K. Hyperon events in photographic emulsions. Nuovo Cim 1, 482–491 (1955). https://doi.org/10.1007/BF02855177
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DOI: https://doi.org/10.1007/BF02855177