Superconductivity in Pb-PbTe thin film structures

The critical temperatures of thin superconducting films of Pb in intimate contact with PbTe have been measured resistively. The films were formed by sequential deposition and by co-evaporation of Pb and PbTe. The results show a depression of the critical temperature.     

Messung des Photoprotonenspektrums aus C12 mit einem Halbleiterdetektor

The photoproton spectrum from C¹², irradiated with 31 MeV bremsstrahlung, was measured with an average resolution of 130 keV using a solid state detector. No essential difference to spectra obtained with other methods was found.     

Nachweis von Pflanzenschutzwirkstoffen in Mischung miteinander mit Hilfe der Infrarot-Spektrographie

Summary It is shown, that each component of a mixture of several pesticides can be recognized by the IR-spectrum of the mixture in certain ranges of concentration. For this purpose a special diagram was elaborated for 16 pesticides. The procedure is illustrated by the example of a 3-component mixture.

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Die Arbeit wurde mit Unterstützung der Deutschen Forschungsgemeinschaft durchgeführt.     

Messungen derK-Konversionskoeffizienten und der Aktivierungsquerschnitte der isomeren Atomkerne Se77m,Se79m,Ge75m und Ge77m

TheK-conversion coefficients α _K of the nuclear isomers Se^77m , Se^79m , Ge^75m and Ge^77m have been measured by detecting theK-röntgen- andγ-radiation from neutron-irradiated Se- and GeO₂-samples with the aid of scintillation counters to be α _K =0.79±0.06, 7.4±0.6, 1.44±0.13, and 1.2±0.6, respectively. In all cases, the values obtained, are in agreement with those taken from the tables ofRose under the assumption of anE3-transition, thus confirming this assignment which was proposed earlier by other authors. In addition, the cross sectionsσ for inducing the activities by slowed down neutrons have been measured to beσ=22±2, 0.40±0.04, 0.20±0.02, and 0.12±0.03 barns, respectively, and are compared with earlier data of several authors.