Impact of the phonon coupling on the photon strength function

Abstract

The pygmy dipole resonances and photon strength functions in stable and unstable Ni and Sn isotopes are calculated within the microscopic self-consistent version of the extended theory of finite fermi systems which includes phonon coupling effects.The Skyrme forces SLy4 is used. A pygmy dipole resonance in ${}^{72}$Ni is predicted at the mean energy of 12.4 MeV exhausting 25.7\% of the total energy-weighted sum rule. The microscopically obtained photon E1 strength functions are compared with available experimental data and used to calculate nuclear reaction properties. Average radiative widths and radiative neutron capture cross sections have been calculated taking the phonon coupling into account as well as the uncertainties caused by various microscopic level density models. In all three quantities considered, the contribution of phonon coupling turned out to be significant and is found necessary to explain available experimental data.

arXiv comment4 pages, 3 figures Submitted to Phys. Rev. C

References in corpus (10)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Exotic modes of excitation in atomic nuclei far from stability
• Microscopic HFB+QRPA predictions of dipole strength for astrophysics applications
• Large-scale QRPA calculation of E1-strength and its impact on the neutron capture cross section
• Coordinate-space solution of the Skyrme-Hartree-Fock-Bogolyubov equations within spherical symmetry. The program HFBRAD (v1.0)
• Extended Theory of Finite Fermi Systems (Collective Vibrations in Closed Shell Nuclei)
• Quasiparticle time blocking approximation within the framework of generalized Green function formalism
• Mode-coupling and the pygmy dipole resonance in a relativistic two-phonon model
• Evolution of the pygmy dipole resonance in Sn isotopes
• Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Cited by in corpus (9)

• Reference Database for Photon Strength Functions
• Large-scale deformed quasiparticle random-phase approximation calculations of the $\gamma$-ray strength function using the Gogny force
• Enhanced low-energy $\gamma$-decay strength of ${}^{70}$Ni and its robustness within the shell model
• Photoneutron cross sections for Ni isotopes: Toward understanding $(n,\gamma )$ cross sections relevant to the weak s-process nucleosynthesis
• Isoscalar and neutron modes in the E1 spectra of Ni isotopes and the relevance of shell effects and the continuum
• Improvements and Testing Practical Expressions for Photon Strength Functions of E1 Gamma-Transitions
• On microscopic theory of radiative nuclear reaction characteristics
• Impact of phonon coupling on the radiative nuclear reaction characteristics
• Microscopic calculations of the characteristics of radiative nuclear reactions for double-magic nuclei