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Applicability and limitations of $$G(r,E)$$ analysis transformed from the inelastic neutron scattering data

非弾性中性子散乱データを用いた$$G(r,E)$$解析の適用可能性とその限界

中村 充孝; 菊地 龍弥*; 川北 至信

Nakamura, Mitsutaka; Kikuchi, Tatsuya*; Kawakita, Yukinobu

最近、非弾性中性子散乱実験(INS)データから変換した実空間動的構造因子$$G(r,E)$$を用いた多結晶NaIのフォノンダイナミクスに関する研究報告を行った。この研究は、通常のINS実験条件(Q$$_{max} sim$$ 5$AA$^{-1}$$)であっても、物理的に十分意味のある実空間ダイナミクス情報が得られることを示したものであり、これまでに蓄積されてきた大量のINSデータの再利用と新たな視点での研究推進を促すものである。今回の発表では、$$G(r,E)$$解析の適用可能性とその限界について詳しく議論する。

Recently, we reported the phonon dynamical study of a polycrystalline NaI by using the dynamical structure factor in real-space $$G(r,E)$$ transformed from the inelastic neutron scattering (INS) data. Our study has shown that the INS experiments under the conventional condition Q$$_{max}$$ $$sim$$ 5$AA$^{-1}$$ can provide us a meaningful information on the phonon dynamics at around the first nearest neighbor distance on accepting the worse real-space resolution. These results suggest the possibility that a large amount of $$S(Q,E)$$ data which were previously obtained can be effectively reused. In this study, we will examine both the applicability and limitations of $$G(r,E)$$ analysis for various types of materials whose INS data were obtained at the Fermi chopper spectrometer 4SEASONS in J-PARC.

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