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Il Nuovo Cimento (1955-1965)

, Volume 5, Issue 5, pp 1074–1082 | Cite as

Multiple meson production in the cosmic radiation

  • E. Lohrmann
Article

Summary

6 jets were selected from about 250 found in cosmic ray plates with the aim to get events representing nucleon-nucleon collisions as closely as possible. Scattering measurements on the shower particles showed that the mean total energy of the mesons in the center of mass system was 0.35 GeV for about 100 GeV primary energy and 0.4 to 1 GeV for primary energies of 1 000 GeV and more. A large fraction of the particles has small energies in the c.m.-system, thus favouring the Heisenberg theory of multiple meson production. No relation between the anisotropy of the angular distribution in the c.m.-system and the inelasticity was found. The inelasticity seems to vary within wide limits. An analysis of the angular distribution of 6 further jets presumably produced by mesons was carried out. The mean energy of these jets was 200 GeV. The angular distribution in the c.m.-system is isotropic within the limits of error.

Riassunto

Tra circa 250 jets trovati in lastre nucleari ne furono scelti 6 nell’intento di trovare degli eventi rappresentanti con la massima possibile fedeltà collisioni nucleone-nucleone. Misure di scattering effettuate sulle particelle degli sciami dimostrarono che l’energia media totale dei mesoni nel sistema del centro di massa era di 0.35 GeV per circa 100 GeV di energia primaria e da 0.4 a 1 GeV per energie primarie di 1 000 GeV ed oltre. Una gran parte delle particelle ha debole energia nel sistema del centro di massa, appoggiando pertanto la teoria di Heisenberg della produzione multipla dei mesoni. Non si è trovata alcuna relazione fra l’anisotropia della distribuzione angolare nel sistema del centro di massa e l’anelasticità. L’anelasticità sembra variare entro vasti limiti. Abbiamo eseguito un’analisi della distribuzione angolare di 6 ulteriori jets presumibilmente prodotti da mesoni. L’energia media di questi jets risultò di 200 GeV. La distribuzione angolare è isotropica entro i limiti di errore.

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Copyright information

© Società Italiana di Fisica 1957

Authors and Affiliations

  • E. Lohrmann
    • 1
    • 2
  1. 1.Hochspannungslaboratorium HechingenGermany
  2. 2.Physikalisches Institut der UniversitätBern

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