Abstract: Target cell of a neutron scattering device, containing liquid metal target material, has its beam window, through which proton beam enters, formed in a structure that is thin and yet can stand both pressure wave stress and thermal stress. In the target cell comprising an outer casing and an inner casing, both having a front face formed with the beam window, and being formed in a double structure of the outer casing and the inner casing with a predetermined distance maintained therebetween so that cooling medium is supplied there and target material is supplied into the inner casing, the beam window of the inner casing is made in a flat plate structure. By this flat plate structure, its rigidity is lowered and cell stress of a secondary stress character caused in the target cell by the pressure wave is reduced. Or, the beam window of the inner casing is formed to have a linear front face in the vertical section and a continuously curved front face in the horizontal section.

Abstract: A compressive/tensile-load-type lead damper absorbs vibration energy by elastic-plastic deformation through bending of lead. The lead damper has a semicircular structural portion at a central portion, and compressive/tensile load input points at opposite ends of the semicircular structural portion. The center of an imaginary circle that overlaps the semicircular structural portion is located on a line connecting the load input points. The lead damper deforms by only a small amount upon receipt of compressive/tensile load and has a compact structure.