section_path: Neutron temperature/Cold neutrons
section_name: Cold neutrons
paragraph_text: Cold neutrons
  
  Cold neutrons are thermal neutrons that have been equilibrated in a very cold substance such as liquid deuterium. Such a cold source is placed in the moderator of a research reactor or spallation source. Cold neutrons are particularly valuable for neutron scattering experiments.
  
  The use of cold and very cold neutrons (VCN) has been a bit limited compared to the use of thermal neutrons due to the relatively lower flux and lack in optical components. However, Innovative solutions have been proposed to offer more options to the scientific community to promote the use of VCN.