Soft dipole mode in 17Ne and the astrophysical 2p capture on 15O

Details Soft dipole mode in 17Ne and the astrophysical 2p capture on 15O Soft dipole mode in 17Ne and the astrophysical 2p capture on 15O

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phlb..641..254g&link_type=abstract

Physics Letters B, Volume 641, Issue 3-4, p. 254-259.

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Coulomb Excitation, Cluster Models, Radiative Capture, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments

Scientific paper

Using the two-proton-halo candidate 17Ne as an example, we discuss the possibility of a soft-dipole mode in protonrich nuclei. The study is based on a three-body model considering 17Ne as an 15O core and two protons. Our calculation predicts a relatively narrow peak in the E1 strength function which exhausts a considerable part of the E1 cluster sum rule at energies only a few MeV above the 2p threshold. We also calculate the 2p capture cross section on 15O at astrophysical conditions appropriate for explosive hydrogen burning in novae and X-ray bursts. Our calculation includes consistently resonant and non-resonant contributions to the astrophysical capture rate. We find that for a broad range of temperatures (including temperatures in excess of 109 K) the rate is dominated by non-resonant contributions.

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