The interplay of single-particle and collective motions in the low-lying states of $$_\Lambda ^{21}$$ with quadrupole-octupole correlations

Xia, Haojie; Wu, X. Y.; Mei, Hua; Yao, J. M.

doi:10.1007/s11433-022-2045-x

Cited by 7 publications

(10 citation statements)

References 79 publications

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“…These interactions have been significantly expanded to incorporate the degrees of freedom of the Λ hyperon and have yielded many successful findings in the study of hypernuclear structure and the properties of dense stars. Specifically, the density-dependent RMF effective interactions DD-LZ1 [61], PKDD [74], DD-ME2, TW99, and DDV [77]; the density-dependent RHF (DDRHF) effective interactions PKO1, PKO2, and PKO3 [74]; and the nonlinear RMF (NLRMF) effective interactions NL-SH [20] and PK1 [78] are selected. In these CDF functionals, the ωtensor coupling, which has been proven essential in reducing the spin-orbit splitting of Λ in hypernuclei [51, 79−81], is ignored.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the blocking effect should be taken into account for the last valence nucleon or hyperon (a detailed description can be found in Ref. [74]).…”

Section: Resultsmentioning

confidence: 99%

“…where the kinetic energy functional of baryons is denoted as , the contributions of the potential energy functional from σ and ω are denoted by the variables and , and are used to represent the contributions from ρ and A, respectively, the center-of-mass adjustment to the mean-field is represented by the term , and takes into account the contribution from nucleon pairing correlations [74].…”

Section: E Pairmentioning

confidence: 99%

“…Here, and represent the scalar and baryon densities, respectively [74]. Additionally, the rearrangement term appears in the DDRMF approach, which contains the summation over all baryons for the isoscalar case of but only over nucleons for the isovector case.…”

Section: E Pairmentioning

confidence: 99%

“…In addition, by comparing three different types of CDF effective interactions, we can find that when the ratio of the isospin scalar-vector meson coupling strength is fixed to the same value, the ratio of the isospin scalar-scalar meson coupling strength may satisfy certain linear correlations with the ratio of the isospin scalar-vector meson coupling strength, which has been systematically explored in several studies [60,64,88]. It should be noted that the linear correlation of the meson-hyperon coupling strength ratios obtained in the RMF framework is obviously not suitable for DDRHF models [74].…”

Section: λ1mentioning

confidence: 99%

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Density-dependent relativistic mean field approach and its application to single-Λ hypernuclei in oxygen hyperisotopes*

Ding 丁,

Yang 杨,

Sun 孙

2023

Chinese Phys. C

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The in-medium feature of nuclear force, which includes both nucleon-nucleon ( ) and hyperon-nucleon ( ) interactions, impacts the description of single-Λ hypernuclei. With the alternated mass number or isospin of hypernuclei, such effects may be unveiled by analyzing the systematic evolution of the bulk and single-particle properties. From a density-dependent meson-nucleon/hyperon coupling perspective, a new effective interaction in the covariant density functional (CDF) theory, namely, DD-LZ1- , is obtained by fitting the experimental data of Λ separation energies for several single-Λ hypernuclei. It is then used to study the structure and transition properties of single-Λ hypernuclei in oxygen hyperisotopes, in comparison with those determined using several selected CDF Lagrangians. A discrepancy is explicitly observed in the isospin evolution of spin-orbit splitting with various effective interactions, which is attributed to the divergence of the meson-hyperon coupling strengths with increasing density. In particular, the density-dependent CDFs introduce an extra contribution to reduce the value but enhance the isospin dependence of the splitting, which originates from the rearrangement terms of Λ self-energies. In addition, the characteristics of hypernuclear radii are studied along the isotopic chain. Owing to the impurity effect of the Λ hyperon, a size shrinkage is observed in the matter radii of hypernuclei compared with the cores of normal nuclei, and its magnitude is further elucidated to correlate with the incompressibility of nuclear matter. Moreover, there is a sizable model-dependent trend in which the Λ hyperon radii evolve with neutron number, which is decided partly by the in-medium interactions and core polarization effects.

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Section: Resultsmentioning

confidence: 99%

“…In addition, the blocking effect should be taken into account for the last valence nucleon or hyperon (a detailed description can be found in Ref. [74]).…”

Section: Resultsmentioning

confidence: 99%

Section: E Pairmentioning

confidence: 99%

Section: E Pairmentioning

confidence: 99%