Darmstadtium the JINR showed signs of Ds being produced from Pu and S. Each team proposed its own name for element 110: the American team proposed "hahnium" after Otto Hahn in an attempt to resolve the situation on element 105 (which they had long been suggesting this name for), the Russian team proposed "becquerelium" after Henri Becquerel, and the German team proposed "darmstadtium" after Darmstadt, the location of their institute. The IUPAC/IUPAP Joint Working Party (JWP) recognised the GSI team as discoverers in their 2001 report, giving them the right to suggest a name for the element. Using Mendeleev's nomenclature for
Otto Hahn transferred from Vienna to Berlin. So began the thirty-year collaboration and lifelong close friendship between the two scientists. After the physicist Harriet Brooks had observed a "radioactive recoil" in 1904, but interpreted it wrongly, Otto Hahn succeeded, in late 1908 and early 1909, in demonstrating the radioactive recoil incident to alpha particle emission and interpreting it correctly. The physicist Walther Gerlach described this as "a profoundly significant discovery in physics with far-reaching consequences". Rutherford in Manchester wrote in a letter to his mother: "He is doing the best work in Germany at present." In 1910, Hahn was appointed professor by