arXiv · 2605.26922
Experimental and theoretical studies of hyperfine structures in $^{21}$Na
Abstract
We measured the hyperfine structure constants, $A(3s^2S_{1/2})$ and $A(3p^2P_{1/2})$, of the neutron-deficient isotope $^{21}\text{Na}$ using CLaSsy, a setup dedicated to collinear laser spectroscopy at RAON. The hyperfine structure constants of $^{21}\text{Na}$ were measured to be $103.6(10)_{\mathrm{stat}}(9)_{\mathrm{syst}}$ MHz for $A(3p^2P_{1/2})$ and $954.9(11)_{\mathrm{stat}}(25)_{\mathrm{syst}}$ MHz for $A(3s^2S_{1/2})$. A systematic comparison with the state-of-the-art ab-initio relativistic coupled cluster calculations shows the role of higher-order correlation effects such as triple excitations in $^{21}$Na. Furthermore, the measurement demonstrates a capability of the CLaSsy setup to conduct collinear laser spectroscopy experiments with a radioactive beam.
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Junho Won, Jeongsu Ha, Deuk Soon Ahn, Sunghoon Ahn, Vivek Chavan, Anastasiia Chekhovska, Gyoungmo Gu, Kevin Insik Hahn, Seongjin Heo, Jangyong Huh, Dahee Kim, Do Gyun Kim, Dong Geon Kim, Jung Bog Kim, Sunji Kim, Yeong Seok Kim, Yung Hee Kim, Zeren Korkulu, Donghyeon Kwak, Jens Lassen, Jin Ho Lee, Jung Woo Lee, Chaeyeong Lim, Joochun Park, Ben Ohayon, Sung Jong Park, Xesus Pereira-Lopez, Peter Plattner, Sung Jae Pyeun, Liss V. Rodríguez, B. K. Sahoo, Taeksu Shin, Changwook Son, Yonghyun Son, Jaehyeon Song, Laszlo Stuhl, Kyoungho Tshoo, Hiroshi Watanabe, Yeong Heum Yeon, Hee Jung Yim, Hoon Yu. 2026-05-26. Experimental and theoretical studies of hyperfine structures in $^{21}$Na. https://arxiv.org/abs/2605.26922
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