Abstract
The shape of scintillation pulses of anthracene crystals excited by 7.5 MeVα-particles and their dependence from temperature and particle impact direction have been investigated. With decreasing temperature the scintillation light is found to be emitted faster. The peak for particle impact directions parallel to the (a,b)-plane atT=20 °K proves to be mainly caused by the delayed component. It is further shown that this peak atT=50 °K reaches maximum height for integration times of about 365 ns, if compared with the minimum scintillation light yield at neighbouring angles. The peak can be explained, if the theoretical model ofKing andVoltz for the delayed component is expanded by taking into account an anisotropy of triplet-exciton diffusion.
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D7 (gekürzt).
Herrn Prof. Dr. A.Flammersfeld danke ich für die Anregung zu dieser Arbeit und für viele wertvolle Ratschläge im Laufe der Untersuchungen. Ferner bin ich Herrn Prof. Dr. R.Hilsch (I. Physikalisches Institut der Universität Göttingen) für den überlassenen flüssigen Stickstoff und Wasserstoff und Herrn Prof. Dr. G. v.Minnigerode für Rat in Fragen der Tieftemperaturtechnik zu großem Dank verpflichtet.
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Bönsch, G. Richtungs- und Temperaturabhängigkeit der Lichtimpulse von Anthrazenkristallen bei Anregung mit α-Teilchen. Z. Physik 212, 497–510 (1968). https://doi.org/10.1007/BF01460352
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DOI: https://doi.org/10.1007/BF01460352