Energy spectrum of charged pions from K− captures in CF3Br

✍ Scribed by F. Abraham; M. Beniston; R. Levi Setti; C. Vossler; J. Lemonne; J. Sacton; F.O. Breivik; Å.J. Eide; A.G. Frodesen; O. Skjeggestad; B. Unneland

• Publisher: Elsevier Science
• Year: 1966
• Weight: 468 KB
• Volume: 81
• Category: Article
• ISSN: 0029-5582
• DOI: 10.1016/s0029-5582(66)80046-9

✦ Synopsis

From about 30 000 stopped K-mesons in the Ecole Polytechnique bubble chamber filled with CFsBr, a search has been made for long-range n-mesons due to the reaction K-+Br -* --* aBr+~z-, in an attempt to determine a lower limit of the A binding energy in aBr. No event compatible with this reaction has been found. Results from measurements of the total n~ and ~z + energy spectra have been used to investigate the production and trapping of A hyperons in K-captures on complex nuclei. From the frequency of A production associated with the emission of ~-mesons with kinetic energy > 110 MeV, the fraction of directly produced A +0.16 hyperons being trapped in the production nuclei was estimated as 0.29_o.0~. For A hyperons due to Z' conversion a lower limit for the same quantity is 0.28 ±0.05.