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arXiv 0908.2607nucl-thastro-ph.SRhep-phnucl-ex
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三体力与氧同位素极限

Three-body forces and the limit of oxygen isotopes

Takaharu Otsuka, Toshio Suzuki, Jason D. Holt, Achim Schwenk, Yoshinori Akaishi

摘要:

丰中子核的极限,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。这导致对过量中子之间相互作用的排斥作用,将中子滴线的位置从$^{28}$ O改变为实验观察到的$^{24}$ O。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。

英文摘要:

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 $^{28}$O to the experimentally observed $^{24}$O. 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.

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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