Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..225l&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 225-233.
Astronomy and Astrophysics
Astronomy
78
Black Holes (Astronomy), Expansion, Neutron Stars, Nuclear Reactions, Stellar Evolution, Density (Mass/Volume), Heavy Nuclei, Matter (Physics), Stellar Mass Ejection, Stellar Models, Stellar Temperature, Supernovae
Scientific paper
The ejection of cold neutron-star matter is examined, and an attempt is made to determine whether the final composition of this matter may be similar to that normally associated with the hot high-neutron-flux r-process. A semiempirical liquid-drop model is used for the nucleus, and the equilibrium composition of the matter is determined by assuming it to be in its absolute ground state at a given density. Physical mechanisms operating during the expansion are analyzed, and the composition of the ejected matter is found as a function of its density during expansion. The results indicate that it is virtually impossible for deuterium to form, that neutrons can be captured only after beta decay increases the atomic numbers of nuclei, and that no free neutrons can escape. It is concluded that neutron-star ejecta can produce heavy neutron-rich nuclei and may produce somewhat heavier nuclei than a standard r-process.
Lattimer James M.
Mackie F.
Ravenhall D. G.
Schramm David N.
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