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Experimental results on the proton-nucleus collisions at 27 GeV in emulsion

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Il Nuovo Cimento (1955-1965)

Summary

We are examining the caracteristics of 3 226 stars produced by collisions of 27 GeV protons against emulsions nuclei. We obtain the mean multiplicities ns = 6.6 + 0.1,n h= 7.2±0.2. The mean energy of the secondary shower particles is 2.3 ±0.2 GeV. The energy transfer to the secondary mesons in the l.s. isK ∼ 0.6. From the study of the angular distribution we obtain the mean number of collisions inside the nucleus to be 1.1 and 27 for light anf heavy nuclei respectively. The mean free path for absorption is λ =38.0±1.0 which according to an optical model corresponds to a. nuclear mean free path λn = (4.3±0.3) fermi.

Riassunto

Abbiamo esaminato le caratteristiche di 3226 stelle prodotte da protoni di 27 GeV contro nuclei delle emulsioni. Per le molteplicità medie si è ottenuto ns = 6.6±0.1;n h= 7.2±0.2. L’energia media dei secondari è stata valutata con un metodo indiretto ed è risultata di 2.3±0.2 GeV. La frazione di energia trasferita ai mesoni secondari nel s.l. ć K∼ 0.6. Dallo studio della distribuzione angolare abbiamo ricavato che il numero medio di collisioni all’interno del nucleo è di 1.1 e 2.7 rispettivamente per i nuclei leggeri e pesanti. 1l cammino libero medio di assorbimento è λ=38.0±1.0 da cui con un modello ottico, si ottiene un λn in materia nucleare uguale a 4.3±0.3 fermi.

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Authors and Affiliations

  1. Istituto di Fisicadrll’ Universià, Roma

    A. Barbaro-Galtieki, A. Manfredini & B. Quassiati

  2. Sezione di Roma, Islituto nazionali’ di Fisica-Nucleare, Roma

    A. Barbaro-Galtieki, A. Manfredini & B. Quassiati

  3. Istituto di Fisica dell Università, Parma

    C. Castagnoli, A. Gainotti & I. Ortalli

  4. Istituto di Fisica, Università di Torino, Torino

    C. Castagnoli

Authors
  1. A. Barbaro-Galtieki
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  2. A. Manfredini
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  3. B. Quassiati
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  4. C. Castagnoli
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  5. A. Gainotti
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  6. I. Ortalli
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On leave from Istituto di Fisica, Università di Torino.

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Barbaro-Galtieki, A., Manfredini, A., Quassiati, B. et al. Experimental results on the proton-nucleus collisions at 27 GeV in emulsion. Nuovo Cim 21, 469–483 (1961). https://doi.org/10.1007/BF02771800

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