Bohr, Aage Niels, << AW guh neels, >> (1922-2009), a Danish physicist, shared the 1975 Nobel Prize for physics with James Rainwater of the United States and Ben Mottelson of Denmark for their work on the structure of the atomic nucleus. See Mottelson, Ben Roy ; Rainwater, James . 
In the 1950’s, experiments had shown that some atomic nuclei were not perfectly spherical, as physicists had previously believed. James Rainwater came up with a theoretical explanation for this observation in terms of the interactions of the particles in the nucleus. Working with Mottelson for a long period starting around 1950, Bohr developed Rainwater’s theories of the nucleus. Their new theory provided an improved understanding of the nucleus. The theory has become known as the collective model of the nucleus.
Aage Niels Bohr was born on June 19, 1922, in Copenhagen. His father was the physicist Niels Bohr, who won the 1922 Nobel Prize for physics (see Bohr, Niels ). Aage Bohr studied physics at the University of Copenhagen, and then worked for the Department of Science and Industrial Research in London from 1943 to 1945. He returned to Denmark in 1945 and obtained his master’s degree from the University of Copenhagen in 1946. Bohr joined his father’s Institute of Theoretical Physics in Copenhagen, which later became the Niels Bohr Institute of Theoretical Physics. He became a professor at the University of Copenhagen in 1956, and director of the Niels Bohr Institute from 1962 to 1971. From 1975 to 1981, he was the director of NORDITA (the Nordic Institute for Theoretical Atomic Physics) in Copenhagen. Bohr died on Sept. 8, 2009.
