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Co-57 and Ti-44 production in SN 1987A
Woosley, S. E.; Hoffman, Robert D.
AA(Lick Observatory, Santa Cruz; Lawrence Livermore National Laboratory, Livermore, CA), AB(Lick Observatory, Santa Cruz; San Francisco State University, CA)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 368, Feb. 20, 1991, p. L31-L34. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Cobalt Isotopes, Nuclear Fusion, Silicon, Supernova 1987a, Titanium Isotopes, Calcium Isotopes, Electron Capture, Iron Isotopes, Oxygen, Supernovae
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A survey of parameterized explosive silicon burning is carried out in order to limit the range of allowed masses of Co-57 produced by SN 1987A. The most likely value is between 0.5 and 2.5 times that implied by a solar ratio for Fe-57/Fe-56. Values more than four and less than one-third times the solar ratio would pose very severe problems for the theory of stellar nucleosynthesis, implying, for example, that Fe-56 was not the dominant iron group isotope or that no electron capture occurred during oxygen burning. Though dependent somewhat on the neutron excess, the Fe-57 yield is most sensitive to the occurrence of an alpha-rich freeze-out. An accurate measurement of the Fe-57 yield, as reflected observationally by the current abundance of radioactive Co-57, is thus an important constraint upon the supernova explosion mechanism. The abundance of Ti-44, another nucleus produced exclusively in the alpha-rich freeze-out, cannot be much greater than that implied by the solar ratio of Ca-44/Fe-56.

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