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On possible short-lived progenitors of fission xenon in carbonaceous chondrites (1975)

Howard, W. M. ; Arnould, M. ; Truran, J. W.

Springer

Astrophysics and space science 36 (1975), S. L1

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ISSN: 1572-946X

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We suggest that the unidentified fission xenon component in carbonaceous chondrites may be attributable to the decay of the extinct radioactivities250Cm and, to a lesser extent,258Cm. Two assumptions are fundamental to this picture: (1) these relatively short-lived actinides (1.13×104 and 3.7×105 yr, respectively) were incorporated into grains in the vicinity of their supernova birthplace (prior to decay); and (2) such grains and their trapped anomalous xenon component were incorporated intact into the meteorites. Recognizing the many substantial uncertainties associated with our suggested model, we emphasize the importance of precise experimental determinations of the mass spectra of fission xenon resulting from250Cm and248Cm decay.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00681956

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Production of Superheavy Nuclei by Multiple Capture of Neutrons (1974)

HOWARD, W. M. ; NIX, J. R.

[s.l.] : Nature Publishing Group

Nature 247 (1974), S. 17-20

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] A new calculation of fission barriers and neutron separation energies for heavy neutron-rich nuclei indicates that it is unlikely that superheavy nuclei can be produced either in the astrophysical r process or in man-made nuclear ...