Ground-state properties of neutron-rich Mg isotopes
Ground-state properties of neutron-rich Mg isotopes
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富中子镁同位素的基态性质
DOI：
10.1103/physrevc.89.044610
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发表时间：
2014
影响因子：
3.1
通讯作者：
and M. Yahiro
中科院分区：
文献类型：
--
作者：
S. Watanabe;K. Minomo;M. Shimada;S. Tagami;M. Kimura;M. Takechi;M. Fukuda;D. Nishimura;T. Suzuki;T. Matsumoto;Y. R. Shimizu;and M. Yahiro
利用折叠模型和反对称化分子动力学（AMD）方法，分析了最近测量的Mg同位素在240 MeV/nucleon入射C靶的反应总截面.当用变形的Woods-Saxon（def-WS）模型和AMD变形计算弹丸密度时，折叠模型较好地再现了测量的反应截面。通过微调def-WS模型的参数，从测量的反应截面推导出Mg的物质半径。核变形大大增强了推导的物质半径。没有自由参数的全微观AMD计算很好地再现了Mg的物质半径，但仍然大大低估了Mg。大的物质半径表明Mg是变形晕核的候选者。AMD还再现了其他现有的测量的Mg同位素的基态性质（自旋宇称，总结合能，和一个中子分离能）。用AMD方法预测了形变参量与中子数的关系。从Mg到Mg的滴线核，出现了较大的变形，表明28和28的magicity都消失了。AMD还预测了中子皮厚度的依赖性。
We analyze recently measured total reaction cross sections forMg isotopes incident onC targets at 240 MeV/nucleon by using the folding model and antisymmetrized molecular dynamics (AMD). The folding model well reproduces the measured reaction cross sections, when the projectile densities are evaluated by the deformed Woods-Saxon (def-WS) model with AMD deformation. Matter radii ofMg are then deduced from the measured reaction cross sections by fine tuning the parameters of the def-WS model. The deduced matter radii are largely enhanced by nuclear deformation. Fully microscopic AMD calculations with no free parameter well reproduce the deduced matter radii forMg, but still considerably underestimate them forMg. The large matter radii suggest thatMg are candidates for deformed halo nucleus. AMD also reproduces other existing measured ground-state properties (spin parity, total binding energy, and one-neutron separation energy) of Mg isotopes. Neutron-number () dependence of deformation parameter is predicted by AMD. Large deformation is seen fromMg withto a drip-line nucleusMg with, indicating that both theand 28 magicities disappear.dependence of neutron skin thickness is also predicted by AMD.