Constraining nuclear symmetry energy with the charge radii of mirror-pair nuclei

An, Rong; Sun, Shuai; Cao, Li-Gang; Zhang, Feng-Shou

doi:10.1007/s41365-023-01269-1

Cited by 15 publications

(3 citation statements)

References 88 publications

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“…由于具有场论基础和可自动给出原子核自旋-轨道劈裂等优势, 相对论平均场理论在原子核性质计算中得到了广泛应用. 近年来, 相对论平均场理论得到了不断完善和发展, 成功地描述了原子核的均方根半径、质量、中子和质子分离能、自旋对称等性质 [51][52][53][54][55][56][57][58][59][60][61][62] . 关于描述超核基态性质的相对论平均场理论可以参考文献 [21][22][23][24][25][26][27], 本文给出简要的介绍.…”

Section: 理论模型unclassified

Isoscalar giant resonances of <inline-formula><tex-math id="M1">\begin{document}$^{{\bf{18}}}_{{\boldsymbol{\Lambda\Lambda}}}{\bf{O}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M1.png"/></alternatives></inline-formula> in relativistic approach

Wen,

Sun,

Cao

et al. 2024

Acta Phys. Sin.

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The interactions between hyperon-nucleon and hyperon-hyperon have been an important topic in strangeness nuclear physics, which play important role in understanding the properties of hypernuclei and equation of state of strangeness nuclear matter. It is very difficult to perform a direct scattering experiment of the nucleon and hyperon because the short lifetime of the hyperon. Therefore, the hyperon-nucleon and hyperon-hyperon interactions have been mainly investigated experimentally by γ spectroscopy of single-Λ or double-Λ hypernuclei. There are also many theoretical methods developed to describe the properties of hypernuclei. These models are focused mostly on the ground state properties of hypernuclei, and have obtained exciting results in producing the banding energies, the energies of single-particle levels, deformation, and other properties of hypernuclei. Only a few work adopting Skyrme energy density functionals is devoted to study the collective excitation properties of hypernuclei. In present work, we have extended the relativistic mean field and relativistic random phase approximation theories to study the collective excitation properties of hypernuclei, and apply the methods to study the isoscalar collective excited state properties of double Λ hypernuclei. First, the effect of Λ hyperons on the single-particle energies of 16O and 18ΛΛO is discussed in the relativistic mean field theory, the calculations are performed within TM1 parameter set and related hyperon-nucleon and hyperon-hyperon interactions. We find that it gives a larger attractive effect on the 1s1/2 states of protons and neutrons, while gives a weaker attractive effect on the states around Fermi surface. The self-consistent relativistic random phase approximation is applied to study the collective excited state properties of hypernucleus 18ΛΛO. The isoscalar giant monopole and quadrupole resonances are calculated and analysed in detail, we pay more attention to the effect of the inclusion of Λ hyperons on the properties of giant resonances. Compared to the strength distributions of 16O, changes on the response functions of 18ΛΛO are evidently found both on the isoscalar giant monopole and quadrupole resonances. It is shown that the difference comes mainly from the changes of Hartree energies of particle-hole configurations and the contributions of the excitations of Λ hyperons. We find that the hyperon-hyperon residual interactions have small effect on the monopole and quadrupole response functions in the low-energy region, and have almost no effect on the response functions in the high-energy region.

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Section: 理论模型unclassified

Isoscalar giant resonances of <inline-formula><tex-math id="M1">\begin{document}$^{{\bf{18}}}_{{\boldsymbol{\Lambda\Lambda}}}{\bf{O}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20231531_M1.png"/></alternatives></inline-formula> in relativistic approach

Wen,

Sun,

Cao

et al. 2024

Acta Phys. Sin.

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“…One way to generally characterize dense nuclear matter is using nuclear empirical parameters defined from a series expansion around the isospin asymmetry. [23,[51][52][53] Among them, nuclear symmetry energy is critical in encoding the energy cost to make the matter more neutron rich. It is thus intriguing to obtain effective constraints over the nuclear symmetry energy with measurements in HICs.…”

Section: -3mentioning

confidence: 99%

Phase Transition Study Meets Machine Learning

Ma 马,

Pang 庞,

Wang 王

et al. 2023

Chinese Phys. Lett.

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“…It is generally known that α and β are sensitive to the composition of emitting sources. Furthermore, α and β are in forms of α = (µ (2) n − µ (1) n )/T,…”

Section: Introductionmentioning

confidence: 99%

Isoscaling properties for neutron-rich fragments in highly asymmetric heavy ion collision systems*

Peng 彭,

Ma 马,

Qiao 乔

et al. 2024

Chinese Phys. C

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Historically, isoscaling has often been understood and applied under the grand canonical ensemble, assuming that the fragments are produced after the statistical equilibrium state is achieved. However, the influence of the symmetry energy may lead to differences in the neutron and density distribution in neutron-rich nuclei, potentially impacting the isoscaling parameters (usually denoted by $\alpha$ and $\beta$. We study the isoscaling properties for neutron-rich fragments produced in very asymmetric systems on inverse kinematics, namely $^{40,48}$Ca and $^{58,64}$Ni + $^{9}$Be at 140 MeV per nucleon. We evaluate the $\alpha$ and $\beta$ value and sort them as a function of the neutron excess $I \equiv N-Z$. The significant differences in $\alpha$ extracted from fragments within different range of $I$ emphasize the importance of understanding the isoscaling parameters dependence of fragments produced in different collision regions. Furthermore, the $|\beta(N)| / \alpha(Z)$ value for a specific fragment in small size and highly isospin asymmetry systems can serve as a probe to detect the variations of neutron density and proton density in different regions of the nucleus and point out the limitations of theoretical models in investigating these issues.

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Constraining nuclear symmetry energy with the charge radii of mirror-pair nuclei

Cited by 15 publications

References 88 publications

Phase Transition Study Meets Machine Learning

Isoscaling properties for neutron-rich fragments in highly asymmetric heavy ion collision systems*

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