Electronic states of materials investigated by alpha decay process

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Although gamma-ray and beta-ray spectroscopy techniques are widely used as a microscopic probe for electronic state investigations, alpha-ray has not been utilized because of the radiation damage or the self-heating effect. In the present study, a technique for the possible alpha-ray spectroscopy is proposed and an apparatus for the alpha-ray detection at low-temperature was developed. The principal idea is to detect anisotropy of alpha-ray emission from the oriented nuclei at low temperature and under magnetic field. For this purpose, (1) a single crystal of actinide material has been prepared, (2) a micro calorimeter working at low temperature under magnetic field was designed and fabricated, and (3) a rotation mechanism was implemented. Using these systems, alpha-particles emitted from the single crystal sample were successfully detected.