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Neutron-capture nucleosynthesis in the helium-burning cores of massive stars
Lamb, S. A.; Howard, W. M.; Truran, J. W.; Iben, I., Jr.
AA(Illinois, University, Urbana, Ill.), AB(Illinois, University, Urbana, Ill.), AC(Illinois, University, Urbana, Ill.), AD(Illinois, University, Urbana, Ill.)
Astrophysical Journal, Part 1, vol. 217, Oct. 1, 1977, p. 213-221. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Helium, Neutrons, Nuclear Fusion, Stellar Evolution, Supernovae, Abundance, Capture Effect, Cosmic Rays, Heavy Nuclei, Stellar Mass, Stellar Models, Stellar Structure
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The paper is concerned with the consequences for nucleosynthesis of the neutron release from the nuclear reaction Ne-22(alpha, n)Mg-25 when it occurs in the convective helium-burning cores of massive stars. The development of the neutron-induced buildup from an original solar system distribution for the cores of 9, 15, and 25 solar masses is studied for the case in which the stars have an initial composition Y = 0.28, Z = 0.02. It is shown that significant enhancements in nuclear abundances up to atomic mass number A equals about 90 can be achieved in all but the lightest of the three models. The s-process nuclei in the mass range 60-70 are produced, and other features of the nucleosynthesis are examined. It is suggested that the results might help explain the origin of galactic cosmic rays and might serve as input for detailed supernova nucleosynthesis calculations.

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