Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section

Abstract

Large-scale QRPA calculations of the E1-strength are performed as a first attempt to microscopically derive the radiative neutron capture cross sections for the whole nuclear chart. A folding procedure is applied to the QRPA strength distribution to take the damping of the collective motion into account. It is shown that the resulting E1-strength function based on the SLy4 Skyrme force is in close agreement with photoabsorption data as well as the available experimental E1-strength at low energies. The increase of the E1-strength at low energies for neutron-rich nuclei is qualitatively analyzed and shown to affect the corresponding radiative neutron capture cross section significantly. A complete set of E1-strength function is made available for practical applications in a table format for all 7<Z<111 nuclei lying between the proton and the neutron drip lines.

17 pages, 8 figures, accepted for publication in Nucl. Phys. A

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• Collectivity of the low-lying dipole strength in relativistic random phase approximation
• QRPA plus Phonon Coupling Model and the Photoabsorbtion Cross Section for ${}^{18,20,22}$O

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