Abstract
The relativistic continuum random phase approximation (RCRPA) is applied to describe the properties of isovector giant dipole resonances (IVGDR) in \(^{208}\)Pb and \(^{132}\)Sn with NL3 effective interaction. We analyze the strength distribution, various sum rules, centroid energies and the integral photoabsorption cross sections of the pygmy dipole resonance (PDR) and giant dipole resonance (GDR), the results are compared to the values obtained by discretized RRPA and available experimental data. Difference between the results obtained by RRPA and RCRPA is found, which may due to the different ways in treating the contribution of continuum. The calculated centroid energies of GDR can reproduce the experimental data well for \(^{208}\)Pb and \(^{132}\)Sn. A better agreement with photoabsorption cross section data is obtained for \(^{132}\)Sn in the RCRPA calculation. By correlating the excitation energy (the electric dipole polarizability) of GDR to the nuclear matter properties, we could constrain the density dependence of symmetry energy. The deduced nuclear symmetry energy is located in the range 30.3–36.5 MeV (30.8–32.8 MeV), and the slope parameter L essentially covers the range of 40.1–106.1 MeV (40.0–63.0 MeV) at the saturation density.
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This manuscript has associated data in a data repository. [Author’s comment: This is a theoretical study and the experimental data used here are referenced or the source is acknowledged. And all the data generated in this article are included in the manuscript.]
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Acknowledgements
This work is supported by the National Natural Science Foundation of China under Grant Nos. 12275025, 11975096, 12135004, 11635003, 11961141004, and the Fundamental Research Funds for the Central Universities under Grant No. 2020NTST06.
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Sun, S., Yu, RQ., Cao, LG. et al. Application of relativistic continuum random phase approximation to giant dipole resonance of \(^{208}\)Pb and \(^{132}\)Sn. Eur. Phys. J. A 60, 61 (2024). https://doi.org/10.1140/epja/s10050-024-01288-5
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DOI: https://doi.org/10.1140/epja/s10050-024-01288-5