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Large-scale calculation of the E 1 photon strength function using a deformed covariant energy density functional approach

par González Miret Zaragoza, Luis ;Ebran, J.P.;Goriely, Stéphane ;Hilaire, Stéphane;Khan, Elias;Péru, S.
Référence Physical Review C, 112, 4
Publication Publié, 2025-10-06

Article révisé par les pairs

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Résumé :

The E1 strength function is calculated over the entire nuclear chart using the axially deformed covariant quasiparticle finite amplitude method (QFAM). A zero-range effective interaction is used, and the numerical parameters of the calculations are optimized, allowing for the calculation of high-energy modes. A procedure to extract the quasiparticle random-phase approximation (QRPA) matrixlike spectrum from the QFAM strength function is established. The centroids and the width of the excited states are corrected by a phenomenological prescription to take into account missing correlations. The comparison to the experimental data shows a good description of the photodisintegration cross sections (including those of light nuclei), as well as average resonance capture and (p, p') ones. Overall, the present calculations provide excellent agreement with the data. Our results are compared to other systematic E1 strength function calculations based on the deformed Gogny QRPA or the fully phenomenological Lorentzian-type approaches. As an application, the present approach is used to describe the propagation of an extra-Galactic 56Fe source, in the framework of the interaction of ultra-high-energy cosmic rays with the cosmic microwave background. The average mass number during the propagation is found to be larger than the one resulting from the E1 strength function calculated with the Gogny functional but close to the one based on the phenomenological parametrization of the E1 strength function.