arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.00307nucl-th
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壳模型基中的Proxy-SU(3)对称性

Proxy-SU(3) symmetry in the shell model basis

Andriana Martinou, Dennis Bonatsos, N. Minkov, I. E. Assimakis, S. K. Peroulis, S. Sarantopoulou, J. Cseh

摘要:

利用单粒子轨道的渐近变形振子基,提出了类自旋轨道核壳的代理SU(3)对称性,其中谐振子壳的对称性的恢复是通过改变入侵者宇称轨道在z方向上的量子数一个单位来实现的。同样的定义在艾略特SU(3)模型的carnival基中也是足够的。通过将Carnive-Elliott基映射到球壳模型基上,我们将代理SU(3)近似转化到球坐标中,证明了在球壳模型基上,代理SU(3)近似对应于用de Shalit-Goldhaber伙伴替代入侵者宇称轨道.此外,还证明了在carnive-Elliott基中的proxy-SU(3)近似等价于z坐标中的幺正变换,而保持x-y平面不变,这一结果在渐近变形振子坐标中意味着角动量和自旋的z投影保持不变。本工作提供了一个微观的理由,代理SU(3)近似,此外铺平了道路,利用代理SU(3)对称性在壳模型计算。

英文摘要:

The proxy-SU(3) symmetry has been proposed for spin-orbit like nuclear shells using the asymptotic deformed oscillator basis for the single particle orbitals, in which the restoration of the symmetry of the harmonic oscillator shells is achieved by a change of the number of quanta in the z-direction by one unit for the intruder parity orbitals. The same definition suffices within the cartesian basis of the Elliott SU(3) model. Through a mapping of the cartesian Elliott basis onto the spherical shell model basis, we translate the proxy-SU(3) approximation into spherical coordinates, proving, that in the spherical shell model basis the proxy-SU(3) approximation corresponds to the replacement of the intruder parity orbitals by their de Shalit--Goldhaber partners. Furthermore it is shown, that the proxy-SU(3) approximation in the cartesian Elliott basis is equivalent to a unitary transformation in the z-coordinate, leaving the x-y plane intact, a result which in the asymptotic deformed oscillator coordinates implies, that the z-projections of angular momenta and spin remain unchanged. The present work offers a microscopic justification of the proxy-SU(3) approximation and in addition paves the way, for taking advantage of the proxy-SU(3) symmetry in shell model calculations.

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