Impact of the phonon coupling on the photon strength function

TL;DR

This paper investigates how phonon coupling influences the photon strength function and related nuclear reaction properties in Ni and Sn isotopes, highlighting its significance for accurate modeling and data agreement.

Contribution

It introduces a microscopic self-consistent approach including phonon coupling effects to predict photon strength functions and reaction properties in Ni and Sn isotopes.

Findings

Phonon coupling significantly affects photon strength functions.

Predicted pygmy dipole resonance in $^{72}$Ni at 12.4 MeV.

Inclusion of phonon coupling improves agreement with experimental data.

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.