Possible shape coexistence in Ne isotopes and the impurity effect of Λ hyperon

Chen, Chen; Sun, Qi; Li, Yuxiao; Sun, T.

doi:10.1007/s11433-021-1721-1

Cited by 17 publications

(5 citation statements)

References 112 publications

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“…The antisymmetrized molecular dynamics method has been applied to explore the lowlying level structure of hypernuclei in beryllium hyperisotopes [70]. The multidimensionally constrained RMF model has been used to study the shape evolution of hypernuclei in argon hyperisotopes [54]. The beyond meanfield approach has been utilized to discuss the evolution of p-state energies and composition in carbon hyperisotopes [24], as well as the hyperon halo structures in boron and carbon hyperisotopes [27,29].…”

Section: λ Snmentioning

confidence: 99%

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: λ Snmentioning

confidence: 99%

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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“…For these reasons, RMF theory is a good candidate for providing a good single-particle spectrum description. Its successful applications include superheavy nuclei [35][36][37][38][39], pseudospin symmetry [40][41][42], single-particle resonances [43,44], hypernuclei [45][46][47][48][49][50][51], thermal shape transitions [52][53][54], and shell correction [55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

A Global Weizsäcker mass model with relativistic mean field shell correction*

Zhang¹,

Li²,

Gao³

et al. 2022

Chinese Phys. C

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Based on the single-particle levels and ground state deformations obtained in the axial deformed relativistic mean field theory, a relativistic Weizsäcker mass model is proposed. The density functional of the relativistic mean field theory is chosen as DD-LZ1 which can partially remove the spurious shell closures. Compared with fourth Weizsäcker-Skyrme mass model, the shell correction energies give wide spreading, and the root-mean-square mass deviation turns out to be 1.353 MeV. Further improvement is in progress.

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“…This leads to the second purpose of our study, where we have obtained 11 EOSs and the corresponding microscopic structures of neutron star matter in a unified manner adopting the numerical recipe proposed in [69]. In particular, as was done in [35,[70][71][72], the properties of nuclear matter are fixed with relativistic mean field (RMF) models [73], which were very successful in describing finite nuclei [73][74][75][76][77][78][79][80][81][82] and nuclear matter [83][84][85][86][87][88][89][90]. Two types of RMF Lagrangian are considered, i.e., those with nonlinear self couplings (NL3 [91], PK1 [92], TM1 [93], GM1 [94], MTVTC [35]) and densitydependent couplings (DD-LZ1 [95], DDME-X [96], PKDD [92], DD-ME2 [97], DD2 [98], TW99 [80]).…”

Section: Introductionmentioning

confidence: 99%

Unified neutron star EOSs and neutron star structures in RMF models

Xia

Maruyama

et al. 2022

Commun. Theor. Phys.

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In the framework of Thomas-Fermi approximation, we study systematically the EOSs and microscopic structures of neutron star matter in a vast density range with $n_\mathrm{b}\approx 10^{-10}$-2 $\mathrm{fm}^{-3}$, where various covariant density functionals are adopted, i.e., those with nonlinear self couplings (NL3, PK1, TM1, GM1, MTVTC) and density-dependent couplings (DD-LZ1, DDME-X, PKDD, DD-ME2, DD2, TW99). It is found that the EOSs generally coincide with each other at $n_\mathrm{b}\lesssim 10^{-4}$ fm${}^{-3}$ and 0.1 fm${}^{-3}\lesssim n_\mathrm{b} \lesssim 0.3$ fm${}^{-3}$, while in other density regions they are sensitive to the effective interactions between nucleons. By adopting functionals with larger slope of symmetry energy $L$, the curvature parameter $K_\mathrm{sym}$ and neutron drip density generally increase, while the droplet size, proton number of nucleus, core-crust transition density, and onset density of non-spherical nuclei decrease. All functionals predict neutron stars with maximum masses exceeding the two-solar-mass limit, while those of DD2, DD-LZ1, DD-ME2, and DDME-X predict optimum neutron star radii according to the observational constraints. Nevertheless, the corresponding skewness coefficients $J$ are much lager than expected, while only the functionals MTVTC and TW99 meet the start-of-art constraints on $J$. More accurate measurements on the radius of PSR J0740+6620 and the maximum mass of neutron stars are thus essential to identify the functional that satisfies all constraints from nuclear physics and astrophysical observations. Approximate linear correlations between neutron stars' radii at $M=1.4 M_{\odot}$ and $2 M_{\odot}$, the slope $L$ and curvature parameter $K_\mathrm{sym}$ of symmetry energy are observed as well, which is mainly attributed to the curvature-slope correlations in the functionals adopted here. The results presented here are applicable for the investigations on the structures and evolutions of compact stars in a unified manner.

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Possible shape coexistence in Ne isotopes and the impurity effect of Λ hyperon

Cited by 17 publications

References 112 publications

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

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

A Global Weizsäcker mass model with relativistic mean field shell correction*

Unified neutron star EOSs and neutron star structures in RMF models

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