Lichtausbeute von α-Teilchen in kristallinem und dampfförmigem Anthrazen |
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Authors: | Helmut Strothmann |
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Institution: | 1. II. Physikalisches Institut der Universit?t G?ttingen, Deutschland
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Abstract: | The light output,S v by α-particles stopped in anthracene vapour has been measured as a function of vapour pressure (10–700 mm Hg) and temperature (250°C–385°C). The comparison of the results for an idealised vapour neglecting collisions with the light output,S c, from anthracene crystals by α-particles impinging parallel to thec′-axis yields the unexpected results: Sv(8.78 MeV)/Sc(8.78 MeV)=0.46±0.05 andS v(6.05 MeV)/S c(6.05 MeV)=0.57±0.08. A simple model assuming quenching by collisions of the vapour molecules could explain the observed dependence of the light output on the vapour pressure at fixed temperature. The path lengthsR v of α-particles in anthracene vapour were determined to be Rv(8.78 MeV)=(9.0±0.6) mg/cm2,R v(6.05 MeV)=(4.9±0.6) mg/cm2 and the ratio of the light output by the two different α-energiesS v(8.78 MeV)/S v(6.05 MeV)=1.42±0.2. |
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