Neutrons are currently used across a vast extent of science. Neutron induced reaction cross-section is indispensable quantity of nuclear data, which is imperative in the applications of nuclear science and technologies. Precise resonance cross-sections are desired for the safety investigation, assessment of the neutron flux density, reaction rate, etc to drive the nuclear technologies such as nuclear power plant. Fission reaction cross-section is the key parameter for the feasibility studies and for designing next generation reactor. This book presents concrete concepts of neutron, neutron production, neutron induced reaction cross-sections, resonances and interrelated matters. Careful and detailed theoretical and contemporary experimental approaches of this text provide clear, correct, and up-to-date information in the field of neutron physics. With comprehensible discussion and numerous experimental results, this book adequately and widely covers all the major categories of neutron cross-sections.