Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..213i&link_type=abstract
Astrophysical Journal, Part 1, vol. 219, Jan. 1, 1978, p. 213-225.
Astronomy and Astrophysics
Astrophysics
25
Electron Decay Rate, Neutrinos, Nuclear Reactions, Stellar Evolution, Stellar Models, Carbon, Helium, Hydrogen, Nuclear Fusion, Stellar Mass
Scientific paper
In the hope of uncovering additional Urca-active nuclei that might appear during carbon burning in the electron-degenerate carbon-oxygen core of an asymptotic-branch star and avert a thermonuclear runaway, a nuclear-reaction matrix connecting 244 nuclear species has been constructed. Analytic expressions for rates of all relevant beta-transitions are also presented and used. It is shown that in matter which is composed initially of elements in a solar-system distribution and which has undergone first complete hydrogen burning and then complete helium burning, neutrino-loss rates due to 11 Urca pairs either rival or exceed neutrino losses predicted by the charge- and neutral-current theories of weak interactions. Most remarkably, no new Urca pairs of any consequence appear as a result of several thousand reactions that are allowed to occur during carbon burning.
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