Nuclear Fission in the Early History of the Earth

Formation of the Solar System from heterogeneous debris of a supernova (SN) that exploded 5 billion years ago was recorded as (1) inter-linked chemical and isotopic heterogeneities in meteorites, (2) higher levels of extinct nuclides in grains that trapped larger isotopic anomalies, (3) the physical properties of grains mentioned in part (2), and (4) patterns of isotopic anomalies in meteorites, in the solar-wind, and in solar flare particles. The Sun formed on the SN core, and planets formed in a rotationally-supported, equatorial disk of SN debris. Interiors of the Sun and the inner planets accreted first in a central, Fe-rich region surrounding the SN core. These were layered as condensate from other parts of the SN fell toward the condensing Sun. Elements in outer SN layers formed low-density, giant Jovian planets. Intra-solar diffusion enriches hydrogen and lighter isotopes of individual elements at the Sun's surface.

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“…The plotting procedure is to choose a set of values of rl, and calculate r 2 from Eq. (20) and m(r2) from Eq. (22) using Eqs (7) and (21).…”

Section: -Fbmentioning

confidence: 99%

Origin of the Solar System and its elements

Manuel

Lee

Ragland

et al. 1998

J Radioanal Nucl Chem

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“…can be drawn each through a few data points. mally high (KURODA, 1960). Similarly, an ex tension of the line TL to 131Xe = 0 leads to the fission mass-yield spectrum obtained by LEWIS et al (1975), in which the abundance at mass number 132 is abnormally low.…”

Section: Datamentioning

confidence: 99%

Xenology: The enigma of xenon in carbonaceous chondrites.

Kuroda

1976

Geochem. J.

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“…The short cooling time scale implies small parent bodies (10 -20 km radii). The only obvious cause of the rapid heating is short-lived radioactivity, but the only candidate, "Al (Urey, 1955) is not very promising Kuroda (1960) on the grounds that if "'I survived long enough to get into the meteorites, then so should '44Pu, which ought to be formed in the same processes and has a longer half-life (82 )& 10' yr). The relevant component resulting from fission of '"Pu was subsequently found by Rowe and Kuroda (1965).…”

Section: The Boron Value Inmentioning

confidence: 99%