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arXiv 2201.04260nucl-thnucl-ex
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Ti、Cr和Fe同位素反转岛边缘总反应截面的大增强

Large enhancement of total reaction cross sections at the edge of the island of inversion in Ti, Cr, and Fe isotopes

W. Horiuchi, T. Inakura, S. Michimasa

摘要:

对富中子Ti、Cr和Fe同位素的核形变进行了系统的分析,以探索N = 40附近的反转岛的原子核结构,预测那里有强的核形变。核的基态由三维坐标空间中的Skyrme Hartree-Fock方法得到,该方法能很好地描述任何核的形状。三种类型的Skyrme相互作用被用来在其同位素链中产生各种变形态。我们发现,在反转岛高度拉长的入侵者轨道的占领不仅诱导大的四极形变,但也大十六极形变。这表现为核物质半径的相当大的增强,显示了核表面附近密度分布的特征壳效应。我们发现,反演岛的边缘,入侵者的轨道开始被占用,可以通过测量在高入射能量的总反应截面的增强来确定。讨论了通过测量总反应截面来限制十六极形变的可能性。

英文摘要:

A systematic analysis of nuclear deformation is made for neutron-rich Ti, Cr, and Fe isotopes to explore the nuclear structure in the island of inversion near N = 40, where strong nuclear deformation is predicted. The nuclear ground states are obtained by the Skyrme Hartree-Fock method in three-dimensional coordinate space, which properly describes any nuclear shape. Three types of Skyrme interactions are employed to generate various deformed states in its isotopic chain. We find that in the island of inversion the occupation of highly elongated intruder orbits induces not only large quadrupole deformation but also large hexadecapole deformation. This appears as a sizable enhancement of the nuclear matter radius, showing the characteristic shell effect of the density profile near the nuclear surface. We show that the edge of the island of inversion, where the intruder orbit starts being occupied, can be determined by measuring the enhancement of the total reaction cross section at high incident energy. The possibility of constraining the hexadecapole deformation by a measurement of the total reaction cross sections is discussed.

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