Upon graduation, he worked on quantum theory in Göttingen, where his research into the atomic nucleus provided the basis for his doctorate. He then worked at the Theoretical Physics Institute of the University of Copenhagen from 1928 to 1931, with a break to work with Ernest Rutherford at the Cavendish Laboratory in Cambridge. He continued to study the atomic nucleus (proposing the "liquid drop" model), but also worked on stellar physics with Robert Atkinson and Fritz Houtermans.
upon graduation he worked on quantum theory in göttingen where his research into the atomic nucleus provided the basis for his doctorate he then worked at the theoretical physics institute of the university of copenhagen from 1928 to 1931 with a break to work with ernest rutherford at the cavendish laboratory in cambridge he continued to study the atomic nucleus (proposing the "liquid drop" model) but also worked on stellar physics with robert atkinson and fritz houtermans