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Il Nuovo Cimento (1943-1954)

, Volume 3, Issue 1, pp 342–348 | Cite as

Sui secondari del mesone generati per urto

  • V. Tongiorgi
Article

Riassunto

Si descrivono esperienze sui secondari del mesone generati per urto in materiali diversi, dalle quali si deduce che in ogni materiale si genera una diversa distribuzione angolare dei secondari nello spazio a causa, essenzialmente, della diffusione che le particelle vi subiscono. Si traggono indicazioni circa i valori degli spessori entro cui la radiazione molle si mette in equilibrio con la dura che la genera e circa i rapporti delle frequenze relative dei secondari sotto i diversi materiali.

Summary

By means of a disposition of counters in coincidence the A. has studied the secondaries of meson produced by shock on Pb, Fe, Al. With the variation of the mean divergency angle between mesons and registered secondaries, the curves representing the secondaries frequencies as functions of the thickness of materials in which they are generated present different shape: for mean angles of 25°, the corresponding frequencies under Pb, Fe, Al are in the ratio of 1∶1,5∶1,7; for greater angles (60°) the law of dependence from material reverses itself: that is, under Al greater frequencies are generated than under Pb. Also the positions of the saturation knees are dependent on the geometry of the recording system; one may however foresee that the balance between primaries and secondaries may be reached within thicknesses equal to about a few radiation lengths (8–10 g/cm2 Pb ∼30 g/cm2 Fe, 50 g/cm2 Al). The results are expounded referring to the effects of diffusion and the results of other Authors on the same subject are discussed.

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References

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Copyright information

© Società Italiana di Fisica 1946

Authors and Affiliations

  • V. Tongiorgi
    • 1
  1. 1.Istituto di Fisica dell’Università di MilanoMilanoItalia

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