Recent enhancements and performance gains from upgrades to ANSTO’s thermal neutron instrument TAIPAN and the triple-axis and Be-filter spectrometers

Rule, K. C.; Darmann, F.; Oste, T.; Bartlett, D T; Franceschini, Ferdi; Berry, Andrew; McGregor, A.; Ogrin, Adrian; Ersez, Tunay; Kafes, A.; Pangelis, S.; Danilkin, Sergey; Stampfl, A. P. J.; Olsen, Scott R.

doi:10.1016/j.nima.2018.05.056

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…The Taipan spectrometer at the Australian Centre for Neutron Scattering (ACNS) at the Australian Nuclear Science and Technology Organisation (ANSTO), configured in the filter-analyzer mode, was used for the inelastic neutron scattering measurements. This experiment took place prior to 2017, i.e., before the Cu monochromator was installed on the instrument. Therefore, the vibrational density of states (vDOS) spectra were limited to an incident energy range of 5 < E i < 70 meV, corresponding to wavenumbers between ∼55 and ∼560 cm –1 , as provided by the highly ordered pyrolytic graphite (HOPG) monochromator.…”

Section: Experimental Methodsmentioning

confidence: 99%

Two Forms of Ice Identified in Mars-like Clay Using Neutron Spectroscopy

et al. 2022

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The capacity of clay minerals to store large amounts of water is utilized in a number of industrial and environmental applications on Earth, for example, as components in geosynthetic clay liners in landfills or ingredients in water-based drilling fluids, and could prove important on Mars to identify future human landing sites where water could be harvested. The subzero behavior of water interacting within the interlayer space of clay minerals is of particular interest in most applications but remains poorly understood. To better understand the hydrothermal mechanism by which water ice bonds and separates from clay interlayers, we have utilized neutron spectroscopy, spectral analysis, and phonon band assignment. The inelastic neutron scattering from sodium montmorillonite, hydrated at 24, 73, and 166% water content, as well as an oven-dried sample, were measured to assess the vibrational density of states. The water contents studied provide a range of pore dimensions within clay gels that have varying degrees of confinement. The type of ice formed from water held in larger intra- and interparticle pores differs substantially from that confined within the interlayer (pseudo-two-layer hydrate), and the differences vary with hydration level. Spectral subtraction over an energy transfer range 50 < E < 550 cm–1 (8 < E < 70 meV) produces clearly two different forms of ice: hexagonal and cubic in the two wetter samples. A form of interfacial ice, presumably of a lower density, is observed in the vibrational density of states spectrum of the sample hydrated to a pseudo-two-layer hydrate (ie 24% gravimetric water content (GWC), 10 H2O/Na+). No hexagonal or cubic ice is observed in this sample. The four vibrational modes within the translation band of hexagonal ice are apparent within the sample hydrated to 166% gravimetric water content, in which pores greater than 20 nm are largely water-filled. By considering hydrogen bonding of the water to the clay surface, our data indicate an increase in the strength of the H-bond due to a shorter distance to the hydroxyl. We attribute this decrease to the pores in the clay generating a localized negative pressure or “suction” effect, thus attracting the water.

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Section: Experimental Methodsmentioning

confidence: 99%

Two Forms of Ice Identified in Mars-like Clay Using Neutron Spectroscopy

et al. 2022

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An overview of polarized neutron instruments and techniques in Asia Pacific

Jiang

2023

AAPPS Bull.

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Polarized neutron scattering is an indispensable tool for exploring a vast range of scientific phenomena. With its dynamic scientific community and significant governmental support as well as the rapid economic growth, the Asia–Pacific region has become a key player in the worldwide neutron scattering arena. From traditional research reactors to cutting-edge spallation neutron sources, this region is home to a myriad of advanced instruments offering a wide range of polarized neutron capabilities. This review aims to provide a comprehensive overview of the development and current status of polarized neutron instruments and techniques in the Asia–Pacific region, emphasizing the important role of the Asia–Pacific region in shaping the landscape of global polarized neutron scattering development.

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