従来より短く測定された146Sm の半減期と146Sm-142Nd年代法を用いた太陽系年代への影響

木下 哲一; 中西 孝; 横山 明彦; Paul M.; Kashiv Y.; Collon P.; Deibel C.M.; DiGiovine B.; Greene J.P.; Henderson D.J.; Jiang C.L.; Marley S.T.; Pardo R.C.; Rehm K.E.; Robertson D.; Scott R.; Schmit C.; Tang X.D.; Vondrasek R.

doi:10.14862/geochemproc.59.0.278.0

Abstracts of Annual Meeting of the Geochemical Society of Japan

Session ID : 3A16

DOI https://doi.org/10.14862/geochemproc.59.0.278.0

Conference information

Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

A shorter 146Sm half-life measured and implications for 146Sm-142Nd chronology in the solar system

*Norikazu Kinoshita, Takashi Nakanishi, Akihiko Yokoyama, M. Paul, Y. Kashiv, P. Collon, C.M. Deibel, B. DiGiovine, J.P. Greene, D.J. Henderson, C.L. Jiang, S.T. Marley, R.C. Pardo, K.E. Rehm, D. Robertson, R. Scott, C. Schmit, X.D. Tang, R. Vondrasek

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Keywords: Half-life, Age, Solar System

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Abstract

Our group had determined half-life of ¹⁴⁶Sm to be 68 My, 34% shorter than currently adopted value, by producing ¹⁴⁶Sm atom, alpha spectrometry and mass spectrometry. Crucial experimental problem has not been identified. The half-life was verified by cosmo-geological method; ages for Earth, Moon, and Mars were re-estimated using the new half-life. The new half-life gives different initial amount of ¹⁴⁶Sm at the time of solar system formation and different ages. On the other hand, age of Moon has been determined by 3 methods of ¹⁴⁶Sm-¹⁴²Nd, Pb-Pb, and ¹⁴⁷Sm-¹⁴³Nd dating. Each age correspond one another within error using the new ¹⁴⁶Sm half-life.

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