マンガンクラスト中のr核60Feと244Pu

木下 哲一; A. Wallner; M.B. Froehlich; M. Hotchkis; J. Feige; M. Paul; S. Pavetich; S.G. Tims; L.K. Fifield; D. Schumann; 本多 真紀; 松崎 浩之; 山形 武靖

doi:10.14862/geochemproc.64.0_185

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.64.0_185

Conference information

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

The r-nuclei 60Fe and 244Pu in manganese crusts

*Norikazu Kinoshita, A. Wallner, M.B. Froehlich, M. Hotchkis, J. Feige, M. Paul, S. Pavetich, S.G. Tims, L.K. Fifield, D. Schumann, Maki Honda, Hiroyuki Matsuzaki, Takeyasu Yamagata

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Keywords: Accelerator mass spectrometry, r-process, neutron star merger, supernova

CONFERENCE PROCEEDINGS FREE ACCESS

Pages 185-

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Abstract

Fe-60(half-life: 2.6Myr) and Pu-244(half-life: 81Myr) were present in the early solar system. However, these nuclides have been extinct now due to the half-life. These nuclides are synthesized in explosive environment such as supernova and neutron star merger. If the explosive event occurs at the vicinity of solar system, nuclides synthesized there should be observed as temporal variation. Growth rate of manganese crust was determined using ¹⁰Be. We detected ⁶⁰Fe input 2Myr ago and 6Myr ago from temporal variation of ⁶⁰Fe. In addition, we could successfully detect ²⁴⁴Pu. Comparing ⁶⁰Fe/²⁴⁴Pu ratio, we presume production ratio in the r-process and origin of the event in which the ⁶⁰Fe and ²⁴⁴Pu were synthesized.

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