论文标题
$^{27-32} $ al的高分辨率激光光谱
High-resolution laser spectroscopy of $^{27-32}$Al
论文作者
论文摘要
$^\ text {27-32} $ al（$ z = 13 $）的超细光谱通过collinear激光光谱在Isolde-Cern设施中使用$ 3S^23p \^2 \^2 \ text {p} {p}^\ text {p}^\ text^\ text {o} {o} ^2 \ text {s} _ {1/2} $原子过渡。首次与$^{29} $ al的磁性偶极矩和$^{29,30} $ al的电动二极管矩相同确定了放射性铝同位素的平均值半径。 $ n = 19 $的可能减少的充电半径可能表明$ n = 20 $ shell闭合的效果在AL链中可见，与$ SD $ Shell中的其他同位素链相反。将实验结果与使用手性有效场理论的两种和三个核子力的多组相似的框架中的实验结果与价值空间相似性重新归一化的框架中的理论计算进行了比较。尽管实验性磁偶极子和电二极管矩的趋势得到了很好的再现，但理论与早期研究一致的理论低估了绝对值。此外，电荷半径的规模和趋势似乎对所选相互作用非常敏感。
Hyperfine spectra of $^\text{27-32}$Al ($Z=13$) have been measured at the ISOLDE-CERN facility via collinear laser spectroscopy using the $3s^23p\ ^2\text{P}^\text{o} _{3/2}\rightarrow 3s^24s\ ^2\text{S}_{1/2}$ atomic transition. For the first time, mean-square charge radii of radioactive aluminum isotopes have been determined alongside the previously unknown magnetic dipole moment of $^{29}$Al and electric quadrupole moments of $^{29,30}$Al. A potentially reduced charge radius at $N=19$ may suggest an effect of the $N=20$ shell closure, which is visible in the Al chain, contrary to other isotopic chains in the $sd$ shell. The experimental results are compared to theoretical calculations in the framework of the valence-space in-medium similarity renormalization group using multiple sets of two and three-nucleon forces from chiral effective field theory. While the trend of experimental magnetic dipole and electric quadrupole moments is well reproduced, the absolute values are underestimated by theory, consistent with earlier studies. Moreover, both the scale and trend of the charge radii appear to be very sensitive to the chosen interaction.
