Abstract
An extended array of emulsion and lead plates has been exposed at Zugspitze for 6 months. The results of the measurements carried out on individual high energy cascades, and families of cascades allow the following conclusions to be drawn:
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a)
The vertical intensity of electrons andγ-quanta with energy > 1000 GeV on Zugspitze (2900 m) is 4.5/8.8 × 10−10 cm−2sec−1ster−1.
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b)
The energy spectrum of these particles has the shape of a power law with exponent — 1.85.
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c)
The production spectrum of secondary particles in individual interactions is derived, and it steepens with increasing primary energy. Using other evidence one may then conclude that this is due to an increase of multiplicity with primary energy.
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The authors are greatly indebted to Miss E.Meyer and Miss A.Oldenburg for their efforts in finding and following many cascades. They would like to thank the emulsion group of DESY, Hamburg, for the development of the plates. They are grateful to the German Post Office and to Dr. B.Meyer for the permission to use the Zugspitz-Laboratory for the exposure. Dr. H.Röhrs and Dr. W.Enge kindly helped in assembling and dismantling the stack. The latter also helped in the construction of the densitometer.
The authors are grateful to Prof. E.Bagge for the facility of his laboratory and to the Forschungsgemeinschaft for financial support of this program. The numerical integrations were carried out using the IBM 7090 computer at Louisiana State University, for which the program was kindly prepared by K. V.Thomson.
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Heidbreder, E., Pinkau, K. Production spectrum of gamma rays in high energy interactions and high energy gamma ray intensity at 2900 m. Z. Physik 211, 51–67 (1968). https://doi.org/10.1007/BF01421339
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DOI: https://doi.org/10.1007/BF01421339