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The reactor-based laboratory at the Institut Laue-Langevin is recognized as the world's most productive and reliable source of slow neutrons for the study of low energy particle and nuclear physics. The book highlightsthe impact of about 600 very diverse publications about work performedin these fields during the pastmore than 30 years of reactor operation at this institute.On one hand neutronsare used as a tool to generate nuclei in excited states for studying their structure and decay, in particular fission. Uniquely sensitive experiments can tell us a great deal about the symmetry character