Isotopes of the Alkaline Earth Metals from Uranium

Abstract

DURING the last two years, the bombardment of uranium by neutrons has led to some striking results, due primarily to the combined efforts of Prof. O. Hahn, L. Meitner and F. Strassmann, working in the Kaiser Wilhelm Institute of Chemistry in Berlin-Dahlem. In addition to three artificial isotopes of uranium, they have succeeded in establishing the existence of six trans-uranium elements of atomic numbers 93—96, and the existence of a seventh trans-uranium element (half-value period = 60 days) is indicated.