Microscopic self-consistent study of neon halos with resonant contributions
Microscopic self-consistent study of neon halos with resonant contributions
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DOI：
10.1016/j.physletb.2014.01.023
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发表时间：
2014-03
影响因子：
4.4
通讯作者：
Shenmin Zhang;Shenmin Zhang;Shenmin Zhang;M. Smith;Zhong-Shu Kang;Jie Zhao
中科院分区：
文献类型：
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作者：
Shenmin Zhang;Shenmin Zhang;Shenmin Zhang;M. Smith;Zhong-Shu Kang;Jie Zhao
最近的反应测量已被解释为外来的富中子同位素29，31 Ne的晕结构的证据。虽然31 Ne的理论研究通常同意其晕的性质，但它们在其性质和潜在原因的预测方面存在显着差异（例如，31 Ne具有p-轨道的逆序）。我们已经对可能的氖晕特征进行了系统的理论分析--第一次使用了完全微观的相对论平均场方法，正确地处理了正能量轨道（如31 Ne中的价中子）与束缚能级的自洽性，以及使原子核与负费米能量松散束缚的配对效应。我们的模型是基于相对论平均场（RMF）理论和Bardeen-Cooper-Schrieffer（BCS）对近似的耦合常数（ACCC）方法的解析延续。计算了~（27 - 31）Ne单粒子共振轨道的中子和物质半径、单中子分离能、p轨道和f轨道能量和占据几率以及中子密度。我们分析了这些结果作为29，31 Ne中子晕形成的证据。我们的模型预测了31 Ne的近轨道1 n晕结构，基于半径从30 Ne增加是从29 Ne到30 Ne增加的7-8倍，以及中子分离能比27 - 30 Ne减少10倍。与其他一些研究相反，我们包含共振产生了一个颠倒的顺序pandforbitals球形和轻微变形的核。此外，我们发现没有证据的ans-orbit 1 nhalo在29 Ne最近声称的文献。
Recent reaction measurements have been interpreted as evidence of a halo structure in the exotic neutron-rich isotopes29,31Ne. While theoretical studies of31Ne generally agree on its halo nature, they differ significantly in their predictions of its properties and underlying cause (e.g., that31Ne has an inverted ordering ofp–forbitals). We have made a systematic theoretical analysis of possible Neon halo signatures – the first using a fully microscopic, relativistic mean field approach that properly treats positive energy orbitals (such as the valence neutron in31Ne) self-consistently with bound levels, as well as the pairing effect that keeps the nucleus loosely bound with negative Fermi energy. Our model is the analytical continuation of the coupling constant (ACCC) method based on a relativistic mean field (RMF) theory with Bardeen–Cooper–Schrieffer (BCS) pairing approximation. We calculate neutron- and matter-radii, one-neutron separation energies,p- andf-orbital energies and occupation probabilities, and neutron densities for single-particle resonant orbitals in27–31Ne. We analyze these results for evidence of neutron halo formation in29,31Ne. Our model predicts ap-orbit 1nhalo structure for31Ne, based on a radius increase from30Ne that is 7–8 times larger than the increase from29Ne to30Ne, as well as a decrease in the neutron separation energy by a factor of ∼10 compared to that of27–30Ne. In contrast to some other studies, our inclusion of resonances yields an inverted ordering ofpandforbitals for spherical and slightly deformed nuclei. Furthermore, we find no evidence of ans-orbit 1nhalo in29Ne as recently claimed in the literature.