Variable-Frequency Nuclear Monochromator Using Single-Line Pure Nuclear Bragg Reflection of Oscillating ~(57)FeBO_3 Single Crystal

摘要

A variable-frequency ~(57)Fe nuclear monochromator has been developed using a pure nuclear Bragg reflection from an oscillating ~(57)FeBO_3 single crystal at the Neel temperature. The Doppler-shifted single-line ~(57)Fe Moessbauer radiation at a fixed beam position was successfully filtered using the third-generation synchrotron radiation (SR) of SPring-8. We describe the principle of the variable-frequency Moessbauer filtering technique, the study on the beam characteristics, and some demonstrative experiments on energy-domain SR Moessbauer spectroscopy.