Application of the Hylleraas-$B$-spline basis set: Nonrelativistic Bethe logarithm of helium

San-Jiang Yang, Yong-Bo Tang, Yong-Hua Zhao +2

In this work, we report an application of Hylleraas-$B$-spline basis set to the nonrelativistic Bethe logarithm calculation of helium. The Bethe logarithm for $n{}^{1}S$, $n$ up to 1…