arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.07652nucl-th
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质子和中子皮与镜像核的对称能

Proton and neutron skins and symmetry energy of mirror nuclei

M. K. Gaidarov, I. Moumene, A. N. Antonov, D. N. Kadrev, P. Sarriguren, E. Moya de Guerra

摘要:

中子皮是原子核的一个重要基本性质,但其精确测量面临许多挑战。受核力电荷对称性的启发,丰中子核的中子皮与相应镜像核的电荷半径之差有关。我们调查这种关系的框架内的Hartree-Fock-Bogoliubov方法与Skyrme相互作用。质子皮肤的预测也在中等质量范围内的几个镜对。首次同时研究了原子核及其镜像伙伴的中子皮厚度与核对称能密度相关特性之间的相关性。作为一个例子,考虑了质量数为$A=48-60$的Ni同位素链。这些数量内的相干密度涨落模型计算使用Brueckner和Skyrme的能量密度泛函的同位旋不对称核物质与两个Skyrme型有效相互作用,SkM* 和SLy 4。结果还提出了对称性能量作为$A$的函数的一个家庭的镜像对从选定的链的核与$Z=20$,$N=14$,和$N=50$。演化曲线在每条链的$N=Z$核处表现出相似的交叉行为,当$N\neq Z$开始时,演化曲线呈现出平滑增长的偏差。比较我们的结果的半径和皮肤从高精度手征力的基础上计算的。

英文摘要:

The neutron skin of nuclei is an important fundamental property, but its accurate measurement faces many challenges. Inspired by charge symmetry of nuclear forces, the neutron skin of a neutron-rich nucleus is related to the difference between the charge radii of the corresponding mirror nuclei. We investigate this relation within the framework of the Hartree-Fock-Bogoliubov method with Skyrme interactions. Predictions for proton skins are also made for several mirror pairs in the middle mass range. For the first time the correlation between the thickness of the neutron skin and the characteristics related with the density dependence of the nuclear symmetry energy is investigated simultaneously for nuclei and their corresponding mirror partners. As an example, the Ni isotopic chain with mass number $A=48-60$ is considered. These quantities are calculated within the coherent density fluctuation model using Brueckner and Skyrme energy-density functionals for isospin asymmetric nuclear matter with two Skyrme-type effective interactions, SkM* and SLy4. Results are also presented for the symmetry energy as a function of $A$ for a family of mirror pairs from selected chains of nuclei with $Z=20$, $N=14$, and $N=50$. The evolution curves show a similar behavior crossing at the $N=Z$ nucleus in each chain and a smooth growing deviation when $N\neq Z$ starts. Comparison of our results for the radii and skins with those from the calculations based on high-precision chiral forces is made.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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