Meitner was also concerned about her family back in Austria. One of her first actions in Sweden was to apply for a Swedish immigration permit for Gusti and her husband Justinian (Jutz) Frisch. Hahn selected Josef Mattauch to replace her as head of the physics section, and went to Vienna to offer him the job. While there he dined with Meitner's sisters Gusti and Gisela and their husbands Jutz Frisch and Karl Lion on 9 November. The next day Gusti informed him that Jutz Frisch had been arrested. That day, Meitner arrived in Copenhagen; arranging a travel visa had been difficult with her invalid Austrian passport. Hahn joined her in Copenhagen on 13 November, and had discussions about the uranium research with Meitner, Bohr and Otto Robert Frisch. The physicists, particularly Meitner, told him that the results of the experiments, particularly the supposed discovery of isomers of radium, could not be correct, and the experiments would have to be re-done.