The experimental evidence for the contraction of volume of gold implanted with hydrogen at low doses is presented. The contraction of lattice upon the addition of other elements is very rare and extraordinary in the solid-state, not only for gold but also for many other solids. To explain the underlying physics, the pure kinetic theory of absorption is not adequate and the detailed interaction of hydrogen in the lattice needs to be clarified. Our analysis points to the importance of the formation of hydride bonds in a dynamic manner and explains why these bonds become weak at higher doses, leading to the inverse process of volume expansion frequently seen in metallic hydrogen containers.
Although electron accelerators are equipments which accelerate electron, in fact they are intense sources of bremsstrahlung photon and neutron beams. Therefore the study on spectroscopy of bremsstrahlung is of great importance. This work presents the results obtained by the authors about the energy distribution of bremsstrahlung spectra, the method for determination of bremsstrahlung photon flux as well as the possibilities for producing neutron and neutron rich radioactive ions beams for fundamental research and practical applications.
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