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- W4383989387 abstract "The in-medium feature of nuclear force which includes both nucleon-nucleon ($NN$) and hyperon-nucleon ($Lambda N$) interactions impacts the description of single-$Lambda$ hypernuclei. With the alternated mass number or isospin of hypernuclei, such effects could be unveiled by analyzing systematical evolution of the bulk and single-particle properties. From a density-dependent meson-nucleon/hyperon coupling perspective, a new $Lambda N$ effective interaction in the covariant density functional (CDF) theory, namely DD-LZ1-$Lambda1$, is obtained by fitting the experimental data of $Lambda$ separation energies for several single-$Lambda$ hypernuclei. It is then adopted to study the structure and transition properties of single-$Lambda$ hypernuclei in Oxygen isotopes, comparing with several selected CDF Lagrangians. Discrepancy is observed explicitly in the isospin evolution of $Lambda1p$ spin-orbit splitting with various effective interactions, ascribed to their divergence of the meson-hyperon coupling strengths with increasing density. In particular, the density-dependent CDFs introduce an extra contribution to enhance the isospin dependence of the splitting, which is originated from the rearrangement terms of $Lambda$ self-energies. In addition, the characteristics of hypernuclear radii are studied along the isotopic chain. Owing to the impurity effect of $Lambda$ hyperon, a size shrinkage is observed in the matter radii of hypernuclei as compared to their cores of normal nuclei, while its magnitude is elucidated further to correlate with the incompressibility of nuclear matter. Besides, there exists a sizable model-dependent trend that $Lambda$ hyperon radii evolve with the neutron number, which is decided partly by the in-medium $NN$ interactions as well as the core polarization effects." @default.
- W4383989387 created "2023-07-12" @default.
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- W4383989387 date "2023-07-10" @default.
- W4383989387 modified "2023-09-23" @default.
- W4383989387 title "Density-dependent relativistic mean field approach and its application to single-$Lambda$ hypernuclei in Oxygen isotopes" @default.
- W4383989387 doi "https://doi.org/10.48550/arxiv.2307.04432" @default.
- W4383989387 hasPublicationYear "2023" @default.
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