Summary
The Ecole Polytechnique one-meter heavy-liquid bubble chamber(1) was exposed at the CERN PS to 6.1, 11.6 and 18.1 GeV/c π− beams. Respectively 33 000, 10 000 and 29 000 pictures containing approximatively 4 pions per picture were taken. The liquid used was a mixture of 86% propane and 14% freon CF3Br by volume (68% propane and 32% freon by mass). The density of the liquid was 0.55, g/cm3, its radiation length 52 cm. From these pictures we have measured the absorption cross-section of negative pions in the heavy liquid and the cross-section for strange-particle production in the reactions: π−+(nucleon)→→(K+\(\bar K\)+nucleon)+nπ and π−+(nucleon)→(K+hyperon)+nπ.
Riassunto
Si è esposta la camera a bolle a liquido pesante da un metro dell’Ecole Polytechnique ai fasci di π− di 6.1, 11.6 e 18.1 GeV/c del PS del CERN. Si sono prese rispettivamente 33 000, 10 000 e 29 000 fotografie contenenti approssimativamente 4 pioni ciascuna. Il liquido usato era una miscela contenente 86% di propano e 14% di freon CF3Br in volume (68% di propano e 32% di freon in peso). La densità del liquido era 0.55 e la sua lunghezza di radiazione 52 cm. Da queste fotografie si è misurata la sezione d’urto per l’assorbimento dei pioni negativi nel liquido pesante e la sezione d’urto per la produzione di particelle strane nelle reazioni π−+nucleone→K+\(\bar K\)+nucleone+nπ e π−+nucleone→K+iperone+nπ.
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Scanning and measurements were made in collaboration with CERN, Milano, Padova and Torino groups.
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Lloret, A., Bezaguet, A., Bloch, M. et al. Pion-nucleon cross-section for absorption and strange particle production at 6.1, 11.6 and 18.1 GeV/c. Nuovo Cim 31, 541–549 (1964). https://doi.org/10.1007/BF02733755
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DOI: https://doi.org/10.1007/BF02733755