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Sahoo, Chaeyeong Lim, Changwook Son, DaHee Kim, Deuk Soon Ahn, Do Gyun Kim, Dong Geon Kim, Donghyeon Kwak, Gyoungmo Gu, Hee Jung Yim, Hiroshi Watanabe, Hoon Yu, Jaehyeon Song, Jangyong Huh, Jens Lassen, Jeongsu Ha, Jin Ho Lee, Joochun Park, Jung Bog Kim, Jung Woo Lee, Junho Won, Kevin Insik Hahn, Kyoungho Tshoo, Laszlo Stuhl, Liss V. Rodr\\'iguez, Peter Plattner, Seongjin Heo, Sunghoon Ahn, Sung Jae Pyeun, Sung Jong Park, Sunji Kim, Taeksu Shin, Vivek Chavan, Xesus Pereira-Lopez, Yeong Heum Yeon, Yeong Seok Kim, Yonghyun Son, Yung Hee Kim, Zeren Korkulu","submitted_at":"2026-05-26T12:19:29Z","abstract_excerpt":"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. 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