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arXiv 1408.4872nucl-thnucl-ex
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原子核壳层能隙的系统研究

Systematic study of shell gaps in nuclei

Qiuhong Mo, Min Liu, Ning Wang

摘要:

本文用八个整体核质量模型系统地研究了整个核图上核子分离能和壳层能隙。对于未测量的富中子区和超重区,这些不同质量模型的预测的不确定性仍然很大。Weizsäcker-Skyrme质量公式的最新版本(WS 4),在Skyrme能量密度泛函的启发下,将模型参数的同位旋依赖性引入到宏观-微观方法中,被认为是描述核质量、分离能和壳层能隙最准确的一个。基于预测的壳层能隙,研究了超重核区可能存在的幻数。除了在$N=184, Z=114$处的壳层闭合外,在$N=178, Z=120$附近的亚壳层闭合也可能对超重核的稳定性起作用。

英文摘要:

The nucleon separation energies and shell gaps in nuclei over the whole nuclear chart are systematically studied with eight global nuclear mass models. For unmeasured neutron-rich and super-heavy regions, the uncertainty of the predictions from these different mass models is still large. The latest version (WS4) of the Weizsäcker-Skyrme mass formula, in which the isospin dependence of model parameters is introduced into the macroscopic-microscopic approach inspired by the Skyrme energy-density functional, is found to be the most accurate one in the descriptions of nuclear masses, separation energies and shell gaps. Based on the predicted shell gaps in nuclei, the possible magic numbers in super-heavy nuclei region are investigated. In addition to the shell closures at $N=184, Z=114$, the sub-shell closures at around $N=178, Z=120$ could also play a role for the stability of super-heavy nuclei.

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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