Development of mossbauer spectrometer with unstable nuclear beam

A feasibility study of ⁵⁷Fe in-beam Moessbauer spectroscopy with a ⁵⁷Mn secondary ion beam at Heavy Ion Medical Accelerator in Chiba (HIMAC) was carried out as a first attempt to implement a research facility for impurity and exotic state studies of materials using unstable nuclear probes. A ⁵⁹Co primary beam of 500 MeV was irradiated to a 15 mm thick Be target to yield ⁵⁷Mn with the intensity of 2 x 10⁵ ppp at the sample. A Moessbauer spectrum of aluminum was obtained and its spectroscopic parameters agreed with the already known values. We successfully demonstrated the ⁵⁷Mn beam at HIMAC is of practical use for Moessbauer spectroscopy. Zinc oxide was chosen for the first sample of practical interest and a Moessbauer measurement was attempted. (author)