Onset of intruder ground state in exotic Na isotopes and evolution of the N=20 shell gap

The onset of intruder ground states in Na isotopes is investigated by comparing experimental data and shell-model calculations. This onset is one of the consequences of the disappearance of the N=20 magic structure, and the Na isotopes are shown to play a special role in clarifying the change of this magic structure. Both the electromagnetic moments and the energy levels clearly indicate an onset of ground state intruder configurations at neutron number N=19 already, which arises only with a narrow N=20 shell gap in Na isotopes resulting from the spin-isospin dependence of the nucleon-nucleon interaction (as compared to a wider gap in stable nuclei like 40Ca). It is shown why the previous report based on the mass led to a wrong conclusion.Comment: 9 pages, 6 figures, to be published in Phys. Rev.

Dynamische In-Vitro-Studie zur Strömungsabhängigkeit der Degradationsrate von Magnesium

Zur Schaffung eines standardisierten Versuchsablaufs für Studien zur Magnesiumdegradation im Rahmen der Entwicklung eines biodegradablen Implantatwerkstoffs, wurde eine Steuerung für einen Prüfstand zur dynamischen in-vitro-Testung programmiert und deren Funktionsfähigkeit mit einer Testreihe bestätigt. Durch die Ergebnisse dieser Versuchsreihe konnte zudem die Strömungsabhängigkeit der Degradationsrate von Magnesium nachgewiesen werden

Electronic interaction in tax administration

In this article ways electronic interaction of tax authorities and taxpayers are considered. Prospects of tax department are also considered