Transfer reactions at two near-barrier energies for the systems32S +100,101Ru have been studied. Differential cross sections have been extracted for a large variety of channels, with a set-up yielding good mass, nuclear charge and energy resolutions. A steeper decrease of the measured angular distributions at backward angles with respect to the prediction of a semiclassical theory is interpreted as a loss of transfer flux feeding more complex channels and/or fusion. Coupled channels calculations, which use the transfer form factors derived from the experiment, reproduce the fusion cross sections at sub-barrier energies. Multi-nucleon transfer seems to play an essential role for the fusion process, as evidenced by the found strong correlations. A systematic comparison is made with the systems33S +90,91,92Zr, which have been the object of a previous experimental study with the same set-up
Amorphe Filme von Ge, Ge + 23 At% Cu und Ge + 40 At% Cu werden durch abschreckende Kondensation hergestellt. Elektronenbeugungsdiagramme dieser Filme werden in situ unmittelbar nach der abschreckenden Kondensation und nach dem Tempern aufgenommen. Die daraus erhaltenen Interferenzfunktionen können zumindest qualitativ mit Hilfe von Mikrokristallmodellen verstanden werden. Dabei müssen Mikrokristalle des Diamantgitters, einer primitiv‐kubischen Nahordnung und einer hexagonalen Struktur zugrunde gelegt werden. Der mit wachsendem Cu‐Gehalt zunehmende metallische Charakter der Filme kann aus diesen Modellen mit der Abnahme der kovalenten Bindungsanteile erklärt werden.
Amorphous metallic alloys were synthesized by the methods of rapid quenching and by mechanical alloying. In contrast to rapid quenching, mechanical alloying is a new process in producing amorphous alloys. In this paper we wilt report the amorphization of Ti-Cu, Hf-Cu, Hf-Ni and Fe-Ni-B alloys. The crystallization behaviour of these amorphous alloys was examined by DTA measurements with different heating rates in the range from 1 to 80 K / rain. The data of mechanically alloyed powders will be compared with those of rapidly quenched materials. Further characterizations were done by X-ray diffraction, SEM and EDAX analyses. In general, the examined amorphous materials prepared by mechanical alloying or rapid quenching show very similar properties.
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