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Extension of the nuclear landscape to hyperheavy nuclei

机译：将核景观扩展到HyperoSvy核

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The properties of hyperheavy nuclei and the extension of nuclear landscape to hyperheavy nuclei are extensively studied within covariant density functional theory. Axial reflection symmetric and reflection asymmetric relativistic Hartree-Bogoliubov (RHB) calculations are carried out. The role of triaxiality is studied within triaxial RHB and triaxial relativistic mean field + BCS frameworks. With increasing proton number beyond Z approximate to 130 the transition from ellipsoidal-like nuclear shapes to toroidal ones takes place. The description of latter shapes requires the basis which is typically significantly larger than the one employed for the description of ellipsoidal-like shapes. Many hyperheavy nuclei with toroidal shapes are expected to be unstable toward multifragmentation. However, three islands of stability of spherical hyperheavy nuclei have been predicted for the first time in Afanasjev et al. [Phys. Lett. B 782, 533 (2018)]. Proton and neutron densities, charge radii, neutron skins, and underlying shell structure of the nuclei located in the centers of these islands have been investigated in detail. Large neutron shell gaps at N = 228, 308, and 406 define approximate centers of these islands in neutron number. On the contrary, large proton gap appear only at Z = 154 in the (Z approximate to 156, N approximate to 310) island. As a result, this is the largest island of stability of spherical hyperheavy nuclei found in the calculations. The calculations indicate the stability of the nuclei in these islands with respect to octupole and triaxial distortions. The shape evolution of toroidal shapes along the fission path and the stability of such shapes with respect to fission have been studied. Fission barriers in neutron-rich superheavy nuclei are studied in triaxial RHB framework; the impact of triaxiality on the heights of fission barriers is substantial in some parts of this region. Based on the results obtained in the present work, the extension of nuclear landscape to hyperheavy nuclei is provided.
机译：广泛研究了多核核和核景观核景观的性质，在协助密度函数理论中进行了广泛的研究。进行轴向反射对称和反射不对称相对论Hartree-Bogoliubov（RHB）计算。在三轴RHB和三轴相对论平均场+ BCS框架内研究了三轴性的作用。随着Z的增加，Z近似为130，从椭圆形状的核形状转变为环形核形状发生。后一种形状的描述需要基础，其通常明显大于用于描述椭圆形状的描述的基础。预计具有环形形状的许多过细胞核对多重型敏感性也不是不稳定的。然而，在Afanasjev等人中首次预测了三个球形过度核的三个稳定性。 [物理。吧。 B 782,533（2018）]。已经详细研究了质子和中子密度，电荷半径，中子皮和核的核的底层壳结构。 n = 228,308，308和406的大中子壳间隙在中子数中定义了这些岛的大致中心。相反，大型质子间隙仅在（Z近似为156，n近似到310）岛的z = 154时出现。结果，这是计算中发现的球形过度核的最大稳定性。计算表明这些岛屿关于辛孔和三轴畸变的核的稳定性。研究了沿裂变路径的环形形状的形状演变及其相对于裂变的这种形状的稳定性。在三轴RHB框架中研究了富含中子过性核的裂变屏障;三轴性对裂变屏障高度的影响在该地区的某些地区是大幅的。基于本作工作中获得的结果，提供了核景观对微核核的延伸。

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