Summary
A calibrated curve is presented expressing grain density as a function ofpβc for π- and μ-mesons, and is found to be in good agreement with the Bethe-Bloch formula for « restricted ionization loss ». The 2-body decays of K-particles were used as monocromatic sources of π- and μ-mesons. Blob-density measurements were reduced to grain-density by means of the O’Ceallaigh theory. A « least squares fit » of the experimental points to the Bethe-Bloch formula, together with the experimental « plateau » point, yielded for the mean ionization potential in AgBr the value (530 ± 100) eV, and for the maximum energy transfer the value (2.9 ± 0.5) · 104 eV.
Riassunto
Si presenta una curva calibrata rappresentante la densità granulare in funzione dipβc per mesoni π e μ e la si trova in buon accordo con la formula di Bethe-Bloch per la « perdita di ionizzazione ristretta ». Come sorgenti monocromatiche dei mesoni π e μ si sono usati i decadimenti in 2 corpi di particelle K. Le misure di densità di blobs si sono ridotte a densità granulare per mezzo della teoria di O’Ceallaigh. Un adattamento dei punti sperimentali alla formula di Bethe-Bloch col calcolo dei minimi quadrati assieme al plateau sperimentale ha dato per il potenziale di ionizzazione medio in AgBr il valore (530 ± 100) eV e per il massimo trasferimento d’energia il valore (2.9 ± 0.5) · 104 eV.
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Alexander, G., Johnston, R.H.W. On the relation between Blob-density and velocity of a singly charged particle in G-5 emulsion. Nuovo Cim 5, 363–379 (1957). https://doi.org/10.1007/BF02855246
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DOI: https://doi.org/10.1007/BF02855246