Inelasticity effect on neutron scattering intensities of the Null-H2O

Y. Kameda, M. Sasaki, T. Usuki, T. Otomo, Keiji Itoh, K. Suzuya, T. Fukunaga

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Time-of-flight (TOF) neutron scattering measurements have been carried out for liquid null-H2O, in which the average coherent scattering length of hydrogen atoms is zero. In order to determine the inelasticity effect depending on both the scattering angle and the neutron flight path ratio, γ [=ls=/ls(l0+ls; l0 and ls denote the moderator-sample and sample-detector distances, respectively], neutron scattering measurements have been performed using three neutron spectrometers, HIT-II, RAT, and SWAN, installed at KENS, Tsukuba, Japan. The self-scattering intensity for the null-H2O was derived by subtracting the known O-O partial structure factor from the observed scattering cross-section. It has been revealed that the magnitude of the inelasticity distortion involved in the self-scattering term is still significant even at a smaller scattering angle than that expected from the first-order inelasticity correction formulas proposed in the literature. The inelasticity distortion in the self-scattering term is found to be preferably reduced by applying the small flight path ratio. An empirical but useful correction procedure for the inelasticity effect is developed using the self-scattering intensities observed for the null-H2O. The present correction procedure is applied to the scattering cross-section observed for aqueous 3mol% alanine solution which involves 20% H of exchangeable hydrogen atoms, and to the first-order difference function ΔH(Q) observed for 4 mol% lithium benzoate heavy water solutions in which H/D isotopic substitution has been applied for benzyl-hydrogen atoms within the benzoate ion. The results indicate that the present inelasticity correction procedure works satisfactorily for the scattering intensity from the aqueous solution containing H atoms.

Original languageEnglish
Pages (from-to)153-163
Number of pages11
JournalJournal of Neutron Research
Volume11
Issue number3
DOIs
Publication statusPublished - 2003
Externally publishedYes

Fingerprint

Neutron scattering
neutron scattering
Scattering
scattering
hydrogen atoms
flight paths
Atoms
Hydrogen
Flight paths
scattering cross sections
neutron spectrometers
moderators
heavy water
coherent scattering
Neutron spectrometers
alanine
Coherent scattering
Heavy water
Moderators
Japan

Keywords

  • Cross-section
  • Inelasticity effect
  • Neutron diffraction
  • Null-HO
  • Self-scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

Cite this

Kameda, Y., Sasaki, M., Usuki, T., Otomo, T., Itoh, K., Suzuya, K., & Fukunaga, T. (2003). Inelasticity effect on neutron scattering intensities of the Null-H2O. Journal of Neutron Research, 11(3), 153-163. https://doi.org/10.1080/10238160310001657817

Inelasticity effect on neutron scattering intensities of the Null-H2O. / Kameda, Y.; Sasaki, M.; Usuki, T.; Otomo, T.; Itoh, Keiji; Suzuya, K.; Fukunaga, T.

In: Journal of Neutron Research, Vol. 11, No. 3, 2003, p. 153-163.

Research output: Contribution to journalArticle

Kameda, Y, Sasaki, M, Usuki, T, Otomo, T, Itoh, K, Suzuya, K & Fukunaga, T 2003, 'Inelasticity effect on neutron scattering intensities of the Null-H2O', Journal of Neutron Research, vol. 11, no. 3, pp. 153-163. https://doi.org/10.1080/10238160310001657817
Kameda, Y. ; Sasaki, M. ; Usuki, T. ; Otomo, T. ; Itoh, Keiji ; Suzuya, K. ; Fukunaga, T. / Inelasticity effect on neutron scattering intensities of the Null-H2O. In: Journal of Neutron Research. 2003 ; Vol. 11, No. 3. pp. 153-163.
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AB - Time-of-flight (TOF) neutron scattering measurements have been carried out for liquid null-H2O, in which the average coherent scattering length of hydrogen atoms is zero. In order to determine the inelasticity effect depending on both the scattering angle and the neutron flight path ratio, γ [=ls=/ls(l0+ls; l0 and ls denote the moderator-sample and sample-detector distances, respectively], neutron scattering measurements have been performed using three neutron spectrometers, HIT-II, RAT, and SWAN, installed at KENS, Tsukuba, Japan. The self-scattering intensity for the null-H2O was derived by subtracting the known O-O partial structure factor from the observed scattering cross-section. It has been revealed that the magnitude of the inelasticity distortion involved in the self-scattering term is still significant even at a smaller scattering angle than that expected from the first-order inelasticity correction formulas proposed in the literature. The inelasticity distortion in the self-scattering term is found to be preferably reduced by applying the small flight path ratio. An empirical but useful correction procedure for the inelasticity effect is developed using the self-scattering intensities observed for the null-H2O. The present correction procedure is applied to the scattering cross-section observed for aqueous 3mol% alanine solution which involves 20% H of exchangeable hydrogen atoms, and to the first-order difference function ΔH(Q) observed for 4 mol% lithium benzoate heavy water solutions in which H/D isotopic substitution has been applied for benzyl-hydrogen atoms within the benzoate ion. The results indicate that the present inelasticity correction procedure works satisfactorily for the scattering intensity from the aqueous solution containing H atoms.

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