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Chemische Zusammensetzung der kosmischen Strahlung niederenergetischer Teilchen vonZ=12 bisZ=28, gemessen in Plastikdetektoren

Measurement of the chemical composition of low energy cosmic ray particles of charges fromZ=12 up toZ=28 using plastic detectors

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Zeitschrift für Physik A Hadrons and nuclei

Abstract

Results of a balloon flight experiment flown from Fort Churchill, Canada, at 1.8 g/cm2 for about 10 hours in 1968 are presented. The study was made using Lexan polycarbonate plastic sheets as a particle detector. The analysis of the flux and the charge composition is based on the measurement of 313 stopping particles from Mg to Ni with energies between 150 and 400 MeV/Nucl. The identification of the tracks of the particles is achieved using the restricted energy loss criterion. The flux is corrected for scanning and detector efficiency corresponding to their charge. We are able to measure the charge of a particle with an accuracy of ±0.3 charge units in the region of the iron peak. This accuracy depends on the detailed study of the cone length versus residual range. The evenZ to oddZ ratio for chargesZ≧20 is 3. We have measured the ratios of Mn/Fe=0.34, Cr/Fe=0.42 and Ca+Sc+Ti/Fe=1.05. From these measured charge ratios a thickness of (3±1) g/cm2 interstellar matter can be deduced.

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Authors and Affiliations

  1. Institut für Reine und Angewandte Kernphysik Kiel, Deutschland

    K. -P. Bartholomä, W. Enge & K. Fukui

  2. Beurlaubt vom Air Force Cambridge Research Laboratory, Bedford, Mass., USA

    K. Fukui

Authors
  1. K. -P. Bartholomä
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  2. W. Enge
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  3. K. Fukui
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Additional information

Vorgetragen auf der Frühjahrstagung der Deutschen Physikalischen Gesellschaft in Bonn im März 1972.

Unser Dank gilt Herrn Prof. Dr. E. Bagge für seine Förderung und die Möglichkeit zur Durchführung dieser Arbeit im Institut für Reine und Angewandte Kernphysik in Kiel. Dem Air Force Cambridge Research Laboratory, Bedford, Mass., USA, danken wir für die Durchführung des Ballonstarts. Für die Bestrahlungen am Schwerionenbeschleuniger HILAC in New Haven, USA, sei der dortigen Arbeitsgruppe gedankt. Für zahlreiche Diskussionen danken wir Herrn Dr. R. Beaujean, insbesondere für seinen Beitrag bei der Entwicklung des Programms zur Berechnung derL—R-Diagramme. Der Deutschen Forschungsgemeinschaft danken wir für die finanzielle Unterstützung dieses Forschungsvorhabens.

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Bartholomä, K.P., Enge, W. & Fukui, K. Chemische Zusammensetzung der kosmischen Strahlung niederenergetischer Teilchen vonZ=12 bisZ=28, gemessen in Plastikdetektoren. Z. Physik 259, 75–91 (1973). https://doi.org/10.1007/BF01394482

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