In spring 1971 I joined the cosmochemistry group at the Max-Planck Institute in Mainz. Rudolf Rieder (an assistant to Heinrich Wänke in Mainz) had decided to go back to Vienna, his hometown. Wänke asked the director of the Institut für Radiumforschung und Kernphysik in Vienna, Prof. Berta Karlik, for a replacement from her institute, which he had graduated from in 1952. As I had just finished my PhD in nuclear physics, Prof. Karlik mentioned to me the possibility of taking a job in Mainz. At the time I was very interested in nuclear physics and intended to do a post-doc...

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