Abstract
Analytical expression for the E1 photon strength functions (PSF) is modified to account for the low-energy enhancement due to nuclear structure effects (presence of low-energy state (LES)). A closed-form expression of the E1 PSF function includes response of two nuclear states: LES and giant diplole resonance (GDR). Expression for the nuclear response function on electromagnetic field is based on a model of excitation of two coupled damped states. These approach is tested for different data sets for spherical nuclei. Impact on PSF shape of coupling between LES and GDR excitations is considered.
Highlights
The average probabilities of γ -transitions at γ -ray emission and photoabsorption can be described using the photon strength functions [1, 2]. These functions are involved in calculations of the observed characteristics of most nuclear reactions. They are used for investigation of nuclear structure as well as in studies of nuclear reaction mechanisms
Different microscopic and macroscopic approaches indicate an important impact of the relationships between the pygmy dipole resonance (PDR) and giant dipole resonance (GDR) modes [7]
We propose a model of two coupled damped state excitations for description of the E1 photon strength functions (PSF)
Summary
The average probabilities of γ -transitions at γ -ray emission and photoabsorption can be described using the photon (radiative, gamma-ray) strength functions [1, 2]. These functions are involved in calculations of the observed characteristics of most nuclear reactions. The pygmy dipole resonance (PDR) is manifested near the neutron separation energy It is most pronounced in spherical atomic nuclei with a large neutron excess. In this case the E1 PSF was approximated, as a rule, by two Lorentzianlike curves. Different microscopic and macroscopic approaches indicate an important impact of the relationships between the PDR and GDR modes [7]
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