Low energy neutron beams are used to address many questions in nuclear physics, particle physics and astrophysics. The scientific issues include elucidating the nature of time reversal noninvariance; understanding the origin of the baryon asymmetry in the Universe; describing the weak interaction between quarks and between nucleons; understanding the origin of the elements in stellar and big bang nucleosynthesis.This book summarizes how spallation neutron sources work and discuss the advantages of pulsed beams in reducing systematic errors in precision measurements. It also describes recent breakthroughs in ultracold neutron production, together with the physics that will be addressed by the new generation of intense neutron sources.Contents:Spallation Neutron Source with Emphasis on Target Systems (T A Gabriel)The European Spallation Source Project ESS, and Its Particle Physics Programme (D Dubbers)Neutron Decay Beyond the Standard Model (P Herczeg)Symmetry Violation in Heavy Nuclei (V Gudkov)Project of New Neutron EDM Measurements (A Serebov et al.)Magnetic Trapping of Ultracold Neutrons: Prospects for an Improved Measurement of the Neutron Lifetime (P R Huffman et al.)Parity-Violating Neutron Spin Rotation Observable (D M Markoff & F E Wietfeldt)A New Approach to Measuring the Neutron Decay Correlations with Cold Neutrons at Lansce (W S Wilburn et al.)and other papersReadership: Researchers and graduate students in nuclear, high energy, particle and accelerator physics.Key Features:The presentation of events / history is unified and easy-to-followMay be used as advanced textbook by advanced undergraduates and graduate students interested in cross-disciplinary social sciencesThe book's historical focus might be of interest to readers who are seeking to understand crucial developments within the risk literature from a ‘History of Economic Thought’ perspective