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

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

Yoneda, Ken-ichiro

AIP conference proceedings, 01/2008, Volume: 972, Issue: 1

Journal Article

Two astrophysical reactions, 22Mg(p,gamma)23Al and 26Si(p,gamma)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 beta+ decay of 22Mg is favored over the 22Mg(p,gamma)23Al reaction, while 26Si(p,gamma)27P reaction is faster than the beta+ 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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