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Report No.

Neutron diffraction under high pressure and implications for Earth sciences

Sano, Asami   

Hydrogen is one of the key components of the Earth. The neutron scattering which has an advantage in detecting the hydrogen hence can become a powerful tool in the Earth science. The pressure and temperature increase with depth and approach around 14 GPa and 1400$$^{circ}$$C at the base of the upper mantle of 410 km. The difficulty of the neutron scattering experiment under such extreme conditions comes from the trade-off between pressure and the sample volume. The beamline PLANET in MLF, J-PARC aims to provide platform of neutron powder diffraction under high pressure. This is the first neutron beamline with a multi-anvil press. The large volume press that can compress the sample to over 12 GPa with the volume of approximately 50 mm$$^{3}$$ allows us to measure the powder diffraction in-situ under upper mantle conditions. The crystallographic information of minerals including hydrogen poCsition provides fundamental understanding of its properties.



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