Physics – Nuclear Physics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrvc..51..392g&link_type=abstract
Physical Review C (Nuclear Physics), Volume 51, Issue 1, January 1995, pp.392-400
Physics
Nuclear Physics
51
Radiative Capture, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, 6<=A<=19, 39<=A<=58
Scientific paper
The influence of two-proton capture reactions on long-lived waiting point isotopes near the proton drip line is discussed for the rp-process reaction flow. These reactions are characterized by two successive proton captures, where the first reaction product is unstable against proton emission, but the second reaction results in a particle stable nucleus. The reactions which have this character and involve long-lived waiting points in the rp process are 15O(2p,γ)17Ne, 18Ne(2p,γ)20Mg, and 38Ca(2p,γ)40Ti. Their rates are presented and compared with the rates of alpha-induced reactions for stellar conditions at high temperatures and densities. We find that the two-proton captures on 15O and 18Ne can only compete for unrealistically high densities, but that 38Ca(2p,γ)40Ti can act as an efficient reaction link at conditions typical for x-ray bursts on neutron stars.
Görres Joachim
Thielemann Friedrich-Karl
Wiescher Michael
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