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arXiv 1201.2497nucl-th
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Ne同位素在反转岛区的形变

Deformation of Ne isotopes in the island-of-inversion region

Takenori Sumi, Kosho Minomo, Shingo Tagami, Masaaki Kimura, Takuma Matsumoto, Kazuyuki Ogata, Yoshifumi R. Shimizu, Masanobu Yahiro

摘要:

Ne同位素在反转岛区的形变由Melbourne $g$ -矩阵的双折叠模型确定,密度由反对称分子动力学(AMD)计算。双折叠模型再现了在240 MeV/核子下$^{28-32}$ Ne与$^{12}$ C的散射反应截面。由此确定的四极形变在反转岛区约为0.4,并且$^{31}$ Ne是具有大形变的晕核。我们提出了一个适当选择的参数集和变形的AMD计算作为一种方便的方式来模拟密度直接计算的AMD的伍兹-撒克逊模型。变形的Woods-Saxon模型提供了密度的适当渐近形式。研究了对效应,指出了角动量投影对获得反转岛区大变形的重要性。

英文摘要:

The deformation of Ne isotopes in the island-of-inversion region is determined by the double-folding model with the Melbourne $g$-matrix and the density calculated by the antisymmetrized molecular dynamics (AMD). The double-folding model reproduces, with no adjustable parameter, the measured reaction cross sections for the scattering of $^{28-32}$Ne from $^{12}$C at 240MeV/nucleon. The quadrupole deformation thus determined is around 0.4 in the island-of-inversion region and $^{31}$Ne is a halo nuclei with large deformation. We propose the Woods-Saxon model with a suitably chosen parameterization set and the deformation given by the AMD calculation as a convenient way of simulating the density calculated directly by the AMD. The deformed Woods-Saxon model provides the density with the proper asymptotic form. The pairing effect is investigated, and the importance of the angular momentum projection for obtaining the large deformation in the island-of-inversion region is pointed out.

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