Three-Body Forces and the Limit of Oxygen Isotopes
Three-Body Forces and the Limit of Oxygen Isotopes
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DOI：
10.1103/physrevlett.105.032501
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发表时间：
2010-07-13
影响因子：
8.6
通讯作者：
Akaishi, Yoshinori
中科院分区：
文献类型：
--
作者：
Otsuka, Takaharu;Suzuki, Toshio;Akaishi, Yoshinori
富中子核的极限，即中子滴线，从轻核到中等质量核有规律地演变，除了氧同位素中的一个惊人的异常。这种反常现象在由微观两核子力导出的壳模型计算中是不能再现的。在这里，我们提出了第一个微观解释的氧异常的基础上，已建立在少体系统的三核子力。这导致了排斥的贡献，多余的中子之间的相互作用，改变了位置的中子滴线从O-28到实验观察到的O-24。由于该机制是强大的和一般的，我们的研究结果影响最富中子核的预测和富中子环境中重元素的合成。
The limit of neutron-rich nuclei, the neutron drip line, evolves regularly from light to medium-mass nuclei except for a striking anomaly in the oxygen isotopes. This anomaly is not reproduced in shell-model calculations derived from microscopic two-nucleon forces. Here, we present the first microscopic explanation of the oxygen anomaly based on three-nucleon forces that have been established in few-body systems. This leads to repulsive contributions to the interactions among excess neutrons that change the location of the neutron drip line from O-28 to the experimentally observed O-24. Since the mechanism is robust and general, our findings impact the prediction of the most neutron-rich nuclei and the synthesis of heavy elements in neutron-rich environments.