14:30 〜 14:45
[R3-13] レニウムマルチメガバール圧力スケールによる内核の密度欠損
キーワード:1次圧力スケール、高圧、地球核、密度欠損、X線非弾性散乱
We report the first primary pressure scale extending to the multi-megabar pressures of Earth’s core by measuring acoustic phonon velocities using inelastic X-ray scattering from a rhenium sample in a diamond anvil cell. Our new pressure scale agrees with previous primary scales at lower pressures and shock compression experiments, but previous scales have overestimated laboratory pressures by 20% at 230GPa. Our new scale suggests the density deficit of the inner core is ~9%, doubling the light-element content of the inner core.