[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
*大谷 栄治1、生田 大穣1、福井 宏之2,3、坂巻 竜也1、石川 大輔4,3、バロン アルフレッド3,4(1. 東北大・院理、2. 兵庫県立大・院理、3. 理化学研究所、4. 高輝度光科学研究センター)
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.
