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Recollections of physics community in 1920s and early 1930s; opportunities for physics work in Europe; awareness of political climate in Germany (1932); relationship with Werner Heisenberg at University of Leipzig; awarded Rockefeller Fellowship to study at University of Rome; contacts with physicists after Leipzig and before Rome; John Von Neumann's list of refugee physicists; offered appointment to position at Stanford University; visit to University of Copenhagen and Niels Bohr's advice to accept appointment; relinquishing of second half of fellowship; influenced by Bohr, Heisenberg and others; Bloch's influence on Enrico Fermi leading to theory of neutrino; met by Gregory Breit on arrival in New York; initial teaching duties at Stanford; theoretical physics in America in 1934; distinctions between Europe and America on theory vs. experiment; seminars with J. Robert Oppenheimer; first interest in experimental work; early research on neutrons; recollections of 1935 Michigan Summer School; started Stanford Summer School in 1936 with George Gamow as first visitor (Fermi 1937, Isidor Isaac Rabi 1938, Victor F. Weisskopf 1939); origin of idea of neutron polarization; 1936 paper proposing neutron magnetic moment experiment; 1937 Galvani Conference in Bologna; use of Berkeley 37-inch cyclotron for magnetic moment experiment; decision to build cyclotron at Stanford; construction supported by Rockefeller Foundation; initial involvement with Manhattan Project; recollections of receiving news of fission; neutron work for Manhattan Project at Stanford; marriage in 1940; work on implosion at Los Alamos Scientific Laboratory; reasons for leaving Los Alamos; work on radar at Harvard University; first ideas on measuring nuclear magnetic resonance (NMR); helpfulness of radar experience in NMR work; William W. Hansen and the klystron; fate of the first Stanford cyclotron; knowledge of Edward M. Purcell's work on NMR; publication of initial results, 1946-1948; Rabi and Polykarp Kusch's work on molecular beams; development of NMR field; Nobel Prize award; association with CERN, 1954; contributions of greatest impact.
Origins of interest in nuclear physics when Gamow came to Gottingen and wrote his alpha radioactivity paper. Assisted Born with treatise on quantum mechanics. Work with Pauli on quantum electrodynamics. Half-year in Copenhagen (1930) working with Bohr, an arrangement which lasted until the war when Rosenfeld was called home. War years in Utrecht, Holland. Lived in England after war until 1958. Topics discussed include: 1931 Rome meeting; reaction at Copenhagen when Bohr received Rutherford’s letter announcing the discovery of the neutron; Heisenberg’s three papers on nuclear structure; a colloquium at Copenhagen on the Fermi experiments; attendance at the 1934 Kharkov Conference; large scale exodus of German physicists as Hitler came to power; Bohr’s assistance in the emigration of refugees. Shows how the physicists themselves recognized the significance of what they were doing, using as examples the discovery of the neutron, the compound nucleus, the neutrino idea, the positron, the Yukawa prediction and fission.