Puchalski Mariusz, Komasa Jacek, Pachucki Krzysztof
Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
Phys Rev Lett. 2020 Dec 18;125(25):253001. doi: 10.1103/PhysRevLett.125.253001.
We perform the four-body calculation of the hyperfine structure in the first rotational state J=1 of the H_{2}, D_{2}, and HD molecules and determine the accurate value for the deuteron electric quadrupole moment Q_{d}=0.285 699(15)(18) fm^{2} in significant disagreement with former spectroscopic determinations. Our results for the hyperfine parameters agree very well with the currently most accurate molecular-beam magnetic resonance measurement performed several decades ago by N.F. Ramsey and coworkers. They also indicate the significance of previously neglected nonadiabatic effects. Moreover, a very good agreement with the recent calculation of Q_{d} based on the chiral effective field theory, although much less accurate, indicates the importance of the spin dependence of nucleon interactions in the accurate description of nuclei.
我们对H₂、D₂和HD分子的第一转动激发态J = 1的超精细结构进行了四体计算，并确定了氘核电四极矩Qd = 0.285 699(15)(18) fm²的精确值，这与先前的光谱测定结果存在显著差异。我们得到的超精细参数结果与几十年前由N.F. 拉姆齐及其同事进行的目前最精确的分子束磁共振测量结果非常吻合。它们还表明了先前被忽视的非绝热效应的重要性。此外，尽管基于手征有效场理论对Qd的计算精度要低得多，但与该计算结果仍有很好的一致性，这表明核子相互作用的自旋依赖性在精确描述原子核中具有重要意义。
