Issue
EPL
Volume 85, Number 6, March 2009
Article Number 64001
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/85/64001
Published online 02 April 2009
EPL, 85 (2009) 64001
DOI: 10.1209/0295-5075/85/64001

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

Takahito Osawa1, Masao Ono2, Fumitaka Esaka3, Satoru Okayasu2, Yusuke Iguchi4, Ting Hao2, Masaaki Magara3 and Tsutomu Mashimo4

1   Neutron Imaging and Activation Analysis Group, Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA) - Tokai, Naka-Gun, Ibaraki, 319-1195, Japan
2   Advanced Science Research Center, Japan Atomic Energy Agency (JAEA) - Tokai, Naka-Gun, Ibaraki, 319-1195, Japan
3   Research Group for Analytical Science, Japan Atomic Energy Agency (JAEA) - Tokai, Naka-Gun, Ibaraki, 319-1195, Japan
4   Shock Wave and Condensed Matter Research Center, Kumamoto University - Kumamoto 860-8555, Japan

osawa.takahito@jaea.go.jp

received 24 December 2008; accepted in final form 25 February 2009; published March 2009
published online 2 April 2009

Abstract
Pure tin metals were centrifuged at 1$\times$106g and at 220 °C for 100 hours, at 0.40$\times$106g at 220–230 °C for 24 hours, and at 0.25$\times$106g at 220 °C for 24 hours. Their isotopic compositions were measured by a secondary ion mass spectrometer (SIMS). 116Sn/120Sn and 124Sn/120Sn ratios of the 1.02$\times$106g sample were considerably different than the initial compositions, and the magnitude of isotopic fractionation reached 2.6$\pm$0.1%. A three-isotope diagram of 116Sn/120Sn vs. 124Sn/120Sn shows conclusively that isotopic fractionation caused by a gravitational field depended only on the isotopic mass.

PACS
47.57.ef - Sedimentation and migration.
67.80.dj - Defects, impurities, and diffusion.
66.30.Fq - Self-diffusion in metals, semimetals, and alloys.

© EPLA 2009