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Mass-dependent isotopic fractionation of a solid tin under a strong gravitational field

Osawa, Takahito ; Ono, Masao ; Esaka, Fumitaka ; Okayasu, Satoru ; Iguchi, Yusuke*; Hao, T.; Magara, Masaaki ; Mashimo, Tsutomu

Pure tin metals were centrifuged at 1$$times$$$$10^6$$ $$g$$ and at 220 $$^{circ}$$C for 100 hours, 0.40$$times$$$$10^6$$ $$g$$ at 220-230 $$^{circ}$$C for 24 hours, and 0.25$$times$$$$10^6$$ $$g$$ at 220 $$^{circ}$$C for 24 hours. Their isotopic compositions were measured by a secondary ion mass spectrometer (SIMS). $$^{116}$$Sn/$$^{120}$$Sn and $$^{124}$$Sn/$$^{120}$$Sn ratios of the 1.02$$times$$$$10^6$$ $$g$$ sample were considerably different than the initial compositions, and the magnitude of isotopic fractionation reached 2.6%. A three-isotope diagram of $$^{116}$$Sn/$$^{120}$$Sn versus $$^{124}$$Sn/$$^{120}$$Sn shows conclusively that isotopic fractionation caused by a gravitational field depended only on isotopic mass.

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Category:Physics, Multidisciplinary

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