抄録
As a neutron has a magnetic dipole moment, we can control a neutron beam by using magnetic field gradient. A sextupole magnet functions as an ideal focusing lens for the neutron beam. By using the sextupole magnet, we can obtain precisely focused neutron beam free from neutron scattering and attenuation by substances. Thus, the sextupole magnet has been considered to be appropriate neutron focusing device for a focusing-geometry SANS (F-SANS) experiment. We have developed magnetic neutron lenses based on the sextupole magnet which has sufficiently large aperture and strong focusing power for the F-SANS experiment, and constructed a F-SANS instrument using the magnetic lens. Here, some results of the F-SANS experiments are also shown and discussed.
