High-energy-resolution monochromator for nuclear resonant scattering of synchrotron radiation by Te-125 at 35.49 keV

Yasuhiko Imai; Yoshitaka Yoda; Shinji Kitao; Ryo Masuda; Satoshi Higashitaniguchi; Chika Inaba; Makoto Seto

doi:10.1117/12.733465

20 September 2007 High-energy-resolution monochromator for nuclear resonant scattering of synchrotron radiation by Te-125 at 35.49 keV

Yasuhiko Imai, Yoshitaka Yoda, Shinji Kitao, Ryo Masuda, Satoshi Higashitaniguchi, Chika Inaba, Makoto Seto

Author Affiliations +

Proceedings Volume 6705, Advances in X-Ray/EUV Optics and Components II; 670512 (2007) https://doi.org/10.1117/12.733465
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

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.

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Yasuhiko Imai, Yoshitaka Yoda, Shinji Kitao, Ryo Masuda, Satoshi Higashitaniguchi, Chika Inaba, and 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

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