Dubnium not have enough experimental data to back their claim. After collecting more data, JINR proposed the name "nielsbohrium" (Ns) in honor of the Danish nuclear physicist Niels Bohr, a founder of the theories of atomic structure and quantum theory. When LBL first announced their synthesis of element 105, they proposed that the new element be named "hahnium" (Ha) after the German chemist Otto Hahn, the "father of nuclear chemistry", thus creating an element naming controversy. In the early 1970s, both teams reported synthesis of the next element, element 106, but did not suggest names. JINR suggested establishing an international committee
Otto Hahn the University of Marburg, where for two years he worked as assistant to his doctoral supervisor, Geheimrat Professor Theodor Zincke. His long-time scientific collaborator Nikolaus Riehl claimed that the family had "a Jewish antecedent", but this didn't hinder Hahn's academic career during the Nazi era. According to journalist Bernt Engelmann, Hahn was often thought of as Jewish because of his "Jewish sounding" surname, but he instead asserts that Hahn only had Jewish ancestors on his maternal side of the family despite "Giese" (his mother's maiden name) not being a traditional Jewish surname. Engelmann claimed that this Jewish ancestry was an