arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2106.04834nucl-thhep-lathep-phnucl-ex
收藏

Wigner SU(4)对称性、成簇性和$^{12}$ C的谱

Wigner SU(4) symmetry, clustering, and the spectrum of $^{12}$C

Shihang Shen, Timo A. Lähde, Dean Lee, Ulf-G. Meißner

摘要:

我们利用一个简单的核子-核子相互作用对$^{12}$ C的低激发能谱进行了晶格计算,该相互作用与自旋和同位旋无关,因此在Wigner的SU(4)对称性下是不变的。我们发现强信号的所有激发态高达$\sim 15$ ~MeV以上的基态,并探讨每个国家使用各种各样的$α$集群和谐振子试验状态,投影到给定的不可约表示的立方群的结构。我们能够验证早期的发现$α$聚类在霍伊尔状态和第二个$2^+$状态的$^{12}$ C。这些成功的计算,以描述完整的低位能谱使用自旋无关的相互作用表明,无论是自旋轨道相互作用是有点弱的$^{12}$ C系统,或$α$集群的影响正在减少他们的影响。这与{ \it ab initio}壳模型计算的先前发现一致。

英文摘要:

We present lattice calculations of the low-lying spectrum of $^{12}$C using a simple nucleon-nucleon interaction that is independent of spin and isospin and therefore invariant under Wigner's SU(4) symmetry. We find strong signals for all excited states up to $\sim 15$~MeV above the ground state, and explore the structure of each state using a large variety of $α$ cluster and harmonic oscillator trial states, projected onto given irreducible representations of the cubic group. We are able to verify earlier findings for the $α$ clustering in the Hoyle state and the second $2^+$ state of $^{12}$C. The success of these calculations to describe the full low-lying energy spectrum using spin-independent interactions suggest that either the spin-orbit interactions are somewhat weak in the $^{12}$C system, or the effects of $α$ clustering are diminishing their influence. This is in agreement with previous findings from {\it ab initio} shell model calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑