|Members, Contacts||Mossbauer Collaboration||TOP(Japanese)|
|Welcome to "Nuclear Radiation Physics" Laboratory|
|Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan|
Nuclei have properties such as spin, magnetic moment and electric quadrupole moment. Using methods based on these nuclear properties, we make various studies in materials science by measuring local electronic states in materials through hyperfine interactions.
One of these methods is Mössbauer spectroscopy. In this spectroscopy, we measure recoilless nuclear resonant absorption of Mössbauer gamma rays whose energy is shifted by Doppler motion. The electronic states are analyzed through changes in the nuclear energy levels affected by local electromagnetic fields, which are caused by surrounding electrons. By neutron irradiation in KUR, we generate short-lived sources such as 129Te, 193Os and 197Pt to measure the Mössbauer effects of 129I, 193Ir and 197Au according thereto. We also generate long-lived sources such as 129mTe and 125mTe for studies of 129I and 125Te Mössbauer effects. This spectroscopy is applied to several studies: electronic states of high-Tc superconductors, electronic states and electric conductivities of highly-conducting organic polymers, charge density waves of low-dimensional conducting materials, and electronic states and functions of biological materials.
Nuclear Resonant Scattering of Synchrotron Radiation
We further make a study of nuclear resonant scattering using synchrotron radiation, which is one of the most cutting-edge methods in materials science using nuclear methods. We intensively make studies of vibrational modes and diffusing motion using inelastic and quasielastic nuclear resonant scattering.
Parametric X-Ray Radiation and Related Radiations
By using linear accelerators, the nature of x-rays emitted through interactions between relativistic electrons and crystals -- especially parametric x-ray radiation and coherent bremsstrahlung -- is investigated and studied about their applications.
page update: 2018/04/01