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<p>The elastic scattering angular distributions for the <sup>7</sup>Li + <sup>138</sup>Ba system at energies between 21 and 32&#xa0;MeV were analyzed using the double folding model with M3Y-Paris interactions and realistic densities. Five density-dependent interaction models—DDM3Y1, CDM3Y2, CDM3Y4, CDM3Y6, and BDM3Y1—were tested. The BDM3Y1 potential, which is the shallowest, required the largest normalization factor (<i>N</i><sub><i>R</i></sub>) to fit the data, whereas the deepest potential (DDM3Y1) required the smallest&#xa0;<i>N</i><sub><i>R</i></sub>. These results align with the nuclear incompressibility values of each model. A systematic reduction in the real potential strength (<i>N</i><sub><i>R</i></sub>&#xa0;≈ 0.43–0.46) was observed, consistent with studies of other weakly bound projectiles. The analysis confirmed the presence of the breakup threshold anomaly, as evidenced by the non-vanishing imaginary potential below the Coulomb barrier. This underscores the significant role of breakup processes in modifying elastic scattering dynamics near the barrier.</p>

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Systematic double folding analysis of 7Li + 138Ba near-barrier scattering with M3Y-paris interactions

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Mohamed A. Dewidar,
  • Ibrahim Bondouk,
  • N. Amangeldi,
  • G. Yergaliuly,
  • A. Baratova,
  • Sh. Hamada

摘要

The elastic scattering angular distributions for the 7Li + 138Ba system at energies between 21 and 32 MeV were analyzed using the double folding model with M3Y-Paris interactions and realistic densities. Five density-dependent interaction models—DDM3Y1, CDM3Y2, CDM3Y4, CDM3Y6, and BDM3Y1—were tested. The BDM3Y1 potential, which is the shallowest, required the largest normalization factor (NR) to fit the data, whereas the deepest potential (DDM3Y1) required the smallest NR. These results align with the nuclear incompressibility values of each model. A systematic reduction in the real potential strength (NR ≈ 0.43–0.46) was observed, consistent with studies of other weakly bound projectiles. The analysis confirmed the presence of the breakup threshold anomaly, as evidenced by the non-vanishing imaginary potential below the Coulomb barrier. This underscores the significant role of breakup processes in modifying elastic scattering dynamics near the barrier.