1Japan Synchrotron Radiation Research Institute (Japan) 2CREST, Japan Science and Technology Agency (Japan) 3Kyoto Univ. (Japan) 4Japan Atomic Energy Agency (Japan)
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We have developed a high-resolution monochromator (HRM) for the measurement of nuclear resonant scattering (NRS)
of synchrotron radiation by Te-125 at 35.49 keV using the backscattering of sapphire (9 1 -10 68). HRMs for nuclei with
excitation energies less than 30 keV have been successfully developed using high angle diffractions by silicon crystals.
Nearly perfect silicon crystal, however, is not suitable for high efficient HRMs at higher energy regions because the
symmetry of the crystal structure is high and the Debye-temperature is low. Therefore, we used high quality synthetic
sapphire crystal, which has low symmetry of crystal structure and high Debye-temperature. The temperature of the
crystal was precisely controlled around 218 K to diffract synchrotron radiation with a Bragg angle of π/2 - 0.52 mrad.
Energy was tuned by changing the crystal temperature under the condition of constant diffraction angle. Energy
resolution was measured by detecting nuclear forward scattering by Te-125 in enriched TeO2. The relative energy
resolution of 2.1×10-7 is achieved, that is 7.5 meV in energy bandwidth. This HRM opens studies on element-specific
dynamics and electronic state of substances containing Te-125.
Yasuhiko Imai,Yoshitaka Yoda,Shinji Kitao,Ryo Masuda,Satoshi Higashitaniguchi,Chika Inaba, andMakoto Seto
"High-energy-resolution monochromator for nuclear resonant scattering of synchrotron radiation by Te-125 at 35.49 keV", Proc. SPIE 6705, Advances in X-Ray/EUV Optics and Components II, 670512 (20 September 2007); https://doi.org/10.1117/12.733465
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Yasuhiko Imai, Yoshitaka Yoda, Shinji Kitao, Ryo Masuda, Satoshi Higashitaniguchi, Chika Inaba, Makoto Seto, "High-energy-resolution monochromator for nuclear resonant scattering of synchrotron radiation by Te-125 at 35.49 keV," Proc. SPIE 6705, Advances in X-Ray/EUV Optics and Components II, 670512 (20 September 2007); https://doi.org/10.1117/12.733465