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arXiv 1607.06103nucl-th
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核形状转变、能级密度和潜在的相互作用

Nuclear shape transitions, level density, and underlying interactions

S. Karampagia, Vladimir Zelevinsky

摘要:

原子核结构的组态相互作用方法是利用有限轨道空间中的有效哈密顿量。这个哈密顿量的各个部分及其相互作用决定了物理学的特定特征,包括平均场的形状和能级密度。这种相互关系没有得到充分理解。我们打算研究由核哈密顿量的不同部分驱动的球形和变形形状之间的相变,并通过改变壳模型矩阵元素来建立核能级密度的集体增强的存在。改变相互作用矩阵元素,我们定义,核在sd和pf壳,与球形和变形形状的部门。利用不需要完全对角化的矩量法,我们将形状转变与相应的能级密度联系起来。在低能量部分的频谱中的能级密度的增强观察到与主要由单粒子转移的矩阵元素引起的变形相变的明确相关性。壳模型核哈密顿量中的单粒子转移矩阵元实际上是形变的载体,提供了转动观测量和增强的能级密度。

英文摘要:

The configuration interaction approach to nuclear structure uses the effective Hamiltonian in a finite orbital space. The various parts of this Hamiltonian and their interplay are responsible for specific features of physics including the shape of the mean field and level density. This interrelation is not sufficiently understood. We intend to study phase transitions between spherical and deformed shapes driven by different parts of the nuclear Hamiltonian and to establish the presence of the collective enhancement of the nuclear level density by varying the shell-model matrix elements. Varying the interaction matrix elements we define, for nuclei in the sd and pf shells, the sectors with spherical and deformed shapes. Using the moments method that does not require the full diagonalization we relate the shape transitions with the corresponding level density. Enhancement of the level density in the low-energy part of the spectrum is observed in clear correlation with a deformation phase transition induced mainly by the matrix elements of single-particle transfer. The single-particle transfer matrix elements in the shell model nuclear Hamiltonian are indeed the carriers of deformation, providing rotational observables and enhanced level densities.

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