The Physics of Ultracold Neutrons
Neutrons provide an important tool for investigations in physics. Ultracold neutrons (UCN) belong to the extremely low energy range (10]-7 eV to 10-8 eV), have velocities in the range 1-10 m s-1 and wavelengths of 100-1000 A. Ultracold neutrons can be kept in hermetically sealed vessels for up to 15 minutes until they decay. This time is sufficient to observe the action of very weak fields and gives an insight into the properties of neutrons and their environment. Capture and heating by wall nuclei reduce the storage time of neutrons to below 15 minutes. Present research areas include attempts to understand and prevent the large losses of UCN, improve storage time, and to obtain fundamental results such as an upper limit to the electric dipole moment of neutrons and improved measurements of decay time. These studies have also led to a new approach to diffraction and diffusion theory, which is applicable to any radiation: waves or corpuscles. The book explains how physicists should cope with the problems of UCN research, how UCN can be used for fundamental and applied research, and summarizes the results which have been published.
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Introduction to the physics of ultracold neutrons
2 UCN generation in a solidstate converter
17 other sections not shown
absorption Akhmetov Altarev aluminium angle angular distribution Antonov Appendix atoms axis beam beryllium calculated collisions component consider converter copper corresponding counting rate decreases density dependence depolarization detector determined deuterium diffraction diffusion direction electropolished equal equation experiment experimental expression factor film follows function G factor gravitational Groshev helium hydrogen Ignatovich incident inelastic scattering inhomogeneities integral interaction isotropic Kosvintsev Kratk layer loss coefficient magnetic field Mampe matrix Maxwellian measured mirror neutron guide notation nuclei number of neutrons obtain parameters Pauli matrices performed phonon plane Pokotilovskii polarization pore probability quantity reactor represented resonance result rotating scattering amplitude scattering cross-section shutter solution Soobshch spectrometer specular specular reflection spin flip spinor Steyerl storage curve substance Substituting surface taking into account temperature theoretical thermal neutrons total reflection transmission trap UCN flux UCN output UCN storage vacuum vector vessel walls wave wavefunction wavevector width zero