Summary
A photon initiated high energy electron-photon cascade was investigated. The energy of the primary photon was determined from the longitudinal development and the lateral distribution of the cascade to be about 2·1012 eV. The energy spectrum of electron pairs generated on the first 1.5 cascade units was measured. The spectrum obtained does not deviate significantly from either the spectrum calculated by the Bethe-Heitler theory or from that calculated by Migdal extending the Landau-Pomerančuk-Ter-Mikaelyan theory.
Riassunto
È stata studiata una cascata di elettroni-fotoni ad alta energia iniziata da un fotone Si è determinata in circa 2·1012 eV l’energia del fotone primario in base allo sviluppo longitudinale ed alla distribuzione laterale della cascata. È stato misurato lo spettro di energia delle coppie di elettroni generate nelle prime 1.5 unità della cascata. Lo spettro ottenuto non differisce in maniera significativa sia dallo spettro calcolato con la teoria di Bethe-Heitler sia da quello calcolato con l’estensione di Migdal della teoria di Landau-Pomerančuk-Ter-Mikaelyan.
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References
The authors are indebted to Dr.Lanius for his kind lending them several plates from the Berlin part of the I-stack.
W. Heitler:The Quantum Theory of Radiation (Oxford, 1954).
A. B. Migdal:Phys. Rev.,103, 1811 (1956).
L. L. Landau andI. A. Pomerančuk:Dokl. Akad. Nauk SSSR,92, 535, 735 (1953).
M. L. Ter-Mikaelyan:Dokl. Akad. Nauk SSSR,94, 1033 (1954).
A. E. Čudakov:Izv. Akad. Nauk SSSR,19, 651 (1955).
D. H. Perkins:Phil. Mag.,46, 1146 (1955).
W. Wolter andM. Mięsowicz:Nuovo Cimento,4, 648 (1956).
K. Vlachovský:Czechosl. Journ. Phys. (in press).
K. Pinkau:Nuovo Cimento,3, 1283 (1956).
K. Pinkau:Phil. Mag.,2, 1389 (1957).
A. A. Varfolomeev andI. A. Svetlolobov: preprint (1959).
J. C. Butcher, B. A. Chartres andH. Messel:Nucl. Phys.,6, 241 (1958).
L. Jánossy andH. Messel:Proc. Phys. Soc., A63, 1110 (1950).
J. Nishimura andK. Kamata:Progr. Theor. Phys.,7, 185 (1952).
E. Lohrman:Nuovo Cimento,2, 1029 (1955).
J. Pernegr, V. Petržílka, J. Sedlák andJ. Vrána:Czechosl. Journ. Phys. (in press).
M. Mięsowicz, O. Stanisz andW. Wolter:Nuovo Cimento,5, 513 (1957).
J. Benisz, Z. Chylinski andW. Wolter:Nuovo Cimento,11, 525 (1959).
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Fenyves, E., Frenkel, A., Telbisz, F. et al. Investigation of a high energy electron-photon cascade in emulsion. Nuovo Cim 14, 1249–1253 (1959). https://doi.org/10.1007/BF02962348
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DOI: https://doi.org/10.1007/BF02962348