Abstract
The newly developed particle-hole dispersive optical model is implemented to evaluate the partial and total branching ratios for direct one-neutron decay of the giant dipole resonance in a few neutron-closedshell nuclei. The calculation results obtained for 48Ca, 90Zr, 140Ce and 208Pb with no specific model parameters are compared with available experimental data.
Highlights
Experimental and theoretical studies of direct one-nucleon decays of any giant resonance carry information about the microscopic structure and decay mechanisms of highenergy particle-hole-type nuclear excitations
The method consists in evaluation within the particlehole dispersive optical model (PHDOM) of the energyaveraged isovector dipole strength function and partial one-neutron-escape strength functions, which determine, respectively, the E1 photoabsorption cross section and the cross sections of the partial “direct + semi-direct” E1(γ, n) reaction accompanied by population of a certain one-hole state of the product nucleus
The partial branching ratio is defined as the ratio of the mentioned one-neutronescape strength function integrated over a GDR region to the isovector dipole strength function integrated over the same region
Summary
Experimental and theoretical studies of direct one-nucleon decays of any giant resonance carry information about the microscopic structure and decay mechanisms of highenergy particle-hole-type nuclear excitations. We implement the newly developed particlehole dispersive optical model (PHDOM) [1] to describe direct one-neutron decay of the isovector giant dipole resonance in the neutral channel (abbreviated below as GDR) for neutron-closed-shell nuclei.
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