Precision calculation of hyperfine-structure constants for extracting nuclear quadrupole moment of $^{43}$Ca

Yong-Bo Tang

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arXiv · 2508.15226

Precision calculation of hyperfine-structure constants for extracting nuclear quadrupole moment of $^{43}$Ca

Yong-Bo Tang

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Abstract

There have been several reported values for the nuclear quadrupole moment of $^{43}$Ca, but significant discrepancies exist among these reported values, ranging from $-0.0408(8)$~b to $-0.065(20)$~b. In this work, we performed an accurate calculation of the electric field gradients of the $4s4p~^3\!P_{1}$, $4s4p~^3\!P_{2}$ and $4s3d~^1\!D_2$ states in the $^{43}$Ca atom using a hybrid method. This hybrid method integrates the advantages of the configuration interaction method and the coupled-cluster method, and can simultaneously account for core-core, core-valence, and valence-valence correlations. By combining our calculated results with the experimental values of the electric quadrupole hyperfine-structure constants of these three states, an accurate and reliable nuclear quadrupole moment of $^{43}$Ca was determined to be $-0.0479(6)$~b, which could be recommended as a reference for $^{43}\text{Ca}$.

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Yong-Bo Tang. 2025-08-21. Precision calculation of hyperfine-structure constants for extracting nuclear quadrupole moment of $^{43}$Ca. https://arxiv.org/abs/2508.15226

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