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Multiple meson production and angular distribution of shower particles produced in cosmic ray « Jets »

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Il Nuovo Cimento (1955-1965)

Summary

In nuclear emulsions exposed to the cosmic radiation, showers have been studied (*) which are produced by singly charged or neutral particles, mainly perhaps nucleons (i.e. « Jets » or mesonic showers; their total, number being 22.) The analysis has been restricted to events whose primary energies are greater than 20 GeV, and the number of visible shower particles of which are equal to or greater than 8. An upper limit ofN h=3 for the « heavy » and « grey » prongs has been chosen for each event. (The total number of charged shower particles is 255 and of « grey » or « heavy » prongs is 28.) Such selected showers are interpreted in terms of multiple meson production, and the shower particles are supposed to be mainly mesons produced at one single nucleon-nucleon collision. Within the spread of primary energies observed (20 ÷ 500 GeV) the angular distribution of shower particles shows a significant deviation from isotropic emission in the centre of mass system of the two colliding nucleons.

Riassunto

Nelle emulsioni nucleari esposte ai raggi cosmici, sono stati studiati dei getti i quali sono generati da una singola carica o da particelle neutre, probabilmente nucleoni (cioè « jets » o getti mesonici; il loro totale essendo 22). L’analisi è stata limitata agli eventi con energie primarie superiori a 20 GeV e numero di particelle visibile eguale o maggiore di 8. Per ogni evento è stato scelto un massimo limite diN h=3 per le tracce « nere » e « grige ». (Il numero totale di particelle cariche dei getti è 255 e delle tracce « grige » o « nere » è 28.) Gli stessi getti scelti sono interpretati come produzione multipla di mesoni, e si suppone che le particelle dei getti, siano probabilmente mesoni prodotti da una sola collisione nucleone-nucleone. Nello spazio della energia primaria osservata (20 ÷ 500 GeV) la distribuzione angolare delle particelle dei getti mostra una deviazione significante dalla emissione isotropa nel baricentro dei due nucleoni urtanti.

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Authors and Affiliations

  1. Max-Planck-Institut für Physik, Göttingen

    L. v. Lindern

  2. Istituto di Fisica dell’Università, Padova

    L. v. Lindern

  3. Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Italy

    L. v. Lindern

Authors
  1. L. v. Lindern
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The data reported in this work are based on a summary of explorations made at Göttingen (Max-Planck-Institut für Physik) and Padua (Istituto di Fisica). I am very much indebted to Dr.G. Salandin who kindly made available his measurements.

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Lindern, L.v. Multiple meson production and angular distribution of shower particles produced in cosmic ray « Jets ». Nuovo Cim 5, 491–501 (1957). https://doi.org/10.1007/BF02855255

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