Coulomb Dissociation of Proton-Rich sd-shell Nuclei for Astrophysical Interest and Their Implications

Astronomy and Astrophysics – Astrophysics

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Nuclear Reaction Models And Methods, Beta Decay, Double Beta Decay, Electron And Muon Capture, 20<=A<=38, Low And Intermediate Energy Heavy-Ion Reactions, Shell Model, Nucleon-Nucleon Interactions

Scientific paper

Two astrophysical reactions, 22Mg(p,γ)23Al and 26Si(p,γ)27P, were investigated by using the Coulomb breakup of proton-rich isotopes 23Al and 27P. The radiative widths determined from the cross sections suggest that the β+ decay of 22Mg is favored over the 22Mg(p,γ)23Al reaction, while 26Si(p,γ)27P reaction is faster than the β+ decay of 26Si around the peak temperature of heavy novae. Two-neutron knockout reactions of the proton-rich sd-shell isotopes 26Si, 30S, and 34Ar were also studied. The measured branching ratios are well reproduced by a theoretical calculation which takes into account nucleon-nucleon correlation in a nucleus.

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