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中村 圭佑; 森下 祐樹; 高崎 浩司; 前畑 京介*; 杉本 哲也*; 木口 優*; 伊豫本 直子*; 満田 和久*
Journal of Low Temperature Physics, 193(3-4), p.314 - 320, 2018/11
被引用回数:0 パーセンタイル:0.00(Physics, Applied)Spectroscopic measurement of L X-ray is one of important techniques for a non-destructive assay of transuranium (TRU) elements because L X-rays of the energy ranging from 10 to 25 keV are emitted following internal conversion after the alpha-decay of TRU elements. For identification of L X-ray peaks of TRU elements, the energy resolution of the detector is required to be lower than 100 eV of the full width at half maximum (FWHM). In this work, a transition-edge-sensor (TES) microcalorimeter was operated for spectroscopic measurements of L X-rays emitted from a Np-237 and Cm-244 source. Typical L X-ray peaks of Pa, U and Pu elements were clearly identified in the obtained energy spectra. The FWHM energy resolution of the TES microcalorimeter was obtained to be 32.7 eV at Pu L alpha1 X-ray peak of 14.28 keV with natural line width of 12.20 eV. We considered a feasibility of a non-destructive assay of TRU elements with experimental L X-ray spectra obtained by the TES microcalorimeter.
橋本 直*; 谷田 聖; 他49名*
no journal, ,
We are developing a new technique to study the strong interaction between a hadron and an atomic nucleus: high-resolution TES-based X-ray spectroscopy of hadronic atoms. The strong interaction induces a shift and broadening of the atomic energy levels from their purely electromagnetic values. Thus, precise measurements of the X-ray-emission lines of a hadronic atom can reveal the hadron-nucleus strong interaction at zero kinetic energy. Presently, we are preparing to measure the -
X-ray lines of kaonic helium-3 and helium-4 (6.2 keV and 6.4 keV, respectively) at the Japan Proton Accelerator Research Complex (J-PARC; Tokai, Japan). If we determined the strong-force shift in the helium 2p orbital to a precision of 0.2 eV, we could distinguish between the two leading antikaon-nucleus strong-interaction models. Here, we plan to use a 240-pixel TES array of about 23 mm
collecting area with 4
m thick Bi absorbers. Our project represents the first attempt to use a TES-based X-ray spectrometer in a charged-particle beamline, and we have identified some challenges: (1) energy resolution is deteriorated by charged-particle passages; (2) a continuum background in the X-ray spectrum is generated by charged particles; (3) the science X-ray yield is expected to be very low, at 200 counts per week for the kaonic-helium-atom experiment. Here we present the status of our project.