Electric and magnetic response to the continuum for A=7 isobars in a dicluster model

Abstract

Mirror isobars ${}^7$Li and ${}^7$Be are investigated in a dicluster model. The magnetic dipole moments and the magnetic dipole response to the continuum are calculated in this framework. The magnetic contribution is found to be small with respect to electric dipole and quadrupole excitations even at astrophysical energies, at a variance with the case of deuteron. Energy weighted molecular sum rules are evaluated and a formula for the molecular magnetic dipole sum rule is found which matches the numerical calculations. Cross-sections for photo-dissociation and radiative capture as well as the S-factor for reactions of astrophysical significance are calculated with good agreement with known experimental data.

arXiv commentAccepted in EPJA

References in corpus (4)

• 3He(alpha,gamma)7Be cross section at low energies
• Radiative alpha-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions
• Electromagnetic strength of neutron and proton single-particle halo nuclei
• Electromagnetic response and break-up of light weakly-bound nuclei in a dicluster model

Cited by in corpus (9)

• The electron screening puzzle and nuclear clustering
• Low-energy ${}^3$He($\alpha$,$\alpha$)${}^3$He elastic scattering and the ${}^3$He($\alpha$,$\gamma$)${}^7$Be reaction
• Analysis of the ${}^3\mathrm{He}(\alpha ,\gamma {)}^7\mathrm{Be}$ and ${}^3\mathrm{H}(\alpha ,\gamma {)}^7\mathrm{Li}$ astrophysical direct capture reactions in a modified potential-model approach
• Low-lying dipole strengths for probable $p$-wave one-neutron halos in the medium mass region
• Astrophysical ${}^3\mathrm{He}(\alpha ,\gamma {)}^7\mathrm{Be}$ and ${}^3\mathrm{H}(\alpha ,\gamma {)}^7\mathrm{Li}$ direct capture reactions in a potential model approach
• Magnetic dipole excitation and its sum rule in nuclei with two valence nucleons
• Two-cluster approach to the properties of one- and two-neutron-halo nuclei
• An overview of the scientific contribution of Andrea Vitturi to Nuclear Physics (being an account of the recent TNP19 meeting held in Padova)
• Applications of nuclear physics to a wider context: from molecules to stars passing through hypernuclei