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

Two-proton radioactivity

“…It was demonstrated that the astrophysical 2p capture rates can be enhanced by as much as several orders of magnitude in certain ranges of excitation energies. Similar tendency was found for the size of a nonresonant E1 contribution to the 2p capture rates [167]. These predictions may have important consequences for the rp-process path changing earlier predictions concerning rp-process waiting points [168].…”

Coulomb dissociation, a tool for nuclear astrophysics

“…However, the time-reversed process of Coulomb dissociation with two protons in the final state is well within reach. An example is Coulomb dissociation of 17 Ne [28], where the soft dipole mode in this protonrich nucleus is discussed. By a suitable Coulomb dissociation experiment valuable information on the 2p-capture cross section on 15 O at astrophysical conditions approriate for explosive burning in novae and X-ray bursts may be obtained.…”

Proton pygmy dipole resonances in17,18Ne: Collective versus noncollective excitations

“…The Borromean 17 Ne is a prominent candidate for a two-proton halo, which can be regarded as an 15 O core in its ground state plus two protons in the d 2 or halo like s 2 configurations. The non-resonant soft dipole mode in 17 Ne was predicted by a three-body model [26]. In the present paper, the pygmy dipole resonances in 17 Ne and 18 Ne are predicted in the interacting shell model.…”

“…The s 2 occupation probability of the ground state in 17 Ne is very controversial in theoretical predictions [25,26]. Three-body cluster theory predicted a large s 2 component and therefore a halo-like structure.…”