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 in mufti on a secret mission to test a pot that heated and released a cloud of arsenicals. His military clothing was returned by his batman Rehfeldt, who remained a lifelong friend. In December 1916, when posted to Berlin, Hahn was able to resume radiochemical research in his institute. In 1917–1918, Hahn and Meitner isolated a long-lived activity, which they named "proto-actinium". Already in 1913, Kazimierz Fajans and Göhring had isolated a short-lived activity from uranium X2 (later known as Pa), and called the substance "brevium". The two activities were different isotopes of the same undiscovered element number 91. For