General Preface.- Introduction: The Effects of Scientific Emigration: Special Methodological Questions.- A. Method.- B. Data Base and Preliminary Descriptive Analyses.- C. Emigrants as Literary Producers in Nuclear Physics.- D. Recognizing Emigrants’ Scientific Achievement: Temporal Order, Social Stratification, and Type of Journal.- E. Disciplinary Landscapes in Nuclear Physics: Social and Cognitive.- I. Simple Ranking by Citation Counts.- II. After the Quantum Revolution: Nuclei, Atoms, and Molecules 1926–1930.- III. Nuclear Physics in Its Revolutionary Phase: From the ‘Annus Mirabilis’ 1932 to Fermi’s Pioneering Discovery.- IV. The Fate of a ‘Normal’ Science in 1941: The Public Role of the Nuclear Researcher Under Attack.- V. The Failure to Return to Normality: Nuclear Physics as a Benefactor of, and Debtor to, Politics.- F. Biography in Context.- I. Educational and Institutional Background of Emigrant Nuclear Physicists.- II. Physical Genealogies: Group Biography of Emigrant Atomic and Nuclear Physicists in Institutional Context.- References.