Kammala jumla mai zuwa: A watan Fabrairun shekara ta 1945, wani karamin rukuni na masana kimiyya sun yi nasarar samar da wani karamin abu a cikin wani mai rarrabawa a cikin RIKEN complex<unk> abu wanda RIKEN's cyclotron ya nuna "ba" uranium-235 ba.
Rundunar Sojin Sama ta Amurka ta kai hari kan Tokyo. Babu wani yunƙuri da aka yi don gina tarin uranium; ruwa mai nauyi ba shi da wadata, amma Takeuchi Masa, wanda ke kula da mai raba Nishina, ya yi lissafin cewa ruwa mai sauƙi zai isa idan za a iya wadatar da uranium zuwa 5<unk>10% uranium-235.