We have studied the solution of the six-nucleon bound state problem using the hyperspherical harmonic (HH) approach. For this study we have considered only two-body nuclear forces. In particular we have used a chiral nuclear potential evolved with the similarity renormalization group unitary transformation. A restricted basis has been selected by performing a careful analysis of the convergence of different HH classes. Finally, the binding energy and other properties of Li ground state are calculated and compared with the results obtained by other techniques. Then, we present a calculation of matrix elements relevant for direct dark matter search involving Li. The results obtained demonstrate the feasibility of using the HH method to perform calculation beyond A = 4.

中文翻译：

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超球谐基内Li6基态的计算

我们已经使用超球面谐波 (HH) 方法研究了六核子束缚态问题的解决方案。对于这项研究，我们只考虑了二体核力。特别地，我们使用了通过相似重整化群酉变换演化的手性核势。通过对不同 HH 类的收敛性进行仔细分析，选择了受限制的基础。最后，计算了锂基态的结合能和其他性质，并与其他技术获得的结果进行了比较。然后，我们提出了与涉及 Li 的直接暗物质搜索相关的矩阵元素的计算。获得的结果证明了使用 HH 方法执行超过 A = 4 的计算的可行性。