Experimental and theoretical studies of hyperfine structures in $^{21}$Na
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2026
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| author | Won, Junho Ha, Jeongsu Ahn, Deuk Soon Ahn, Sunghoon Chavan, Vivek Chekhovska, Anastasiia Gu, Gyoungmo Hahn, Kevin Insik Heo, Seongjin Huh, Jangyong Kim, Dahee Kim, Do Gyun Kim, Dong Geon Kim, Jung Bog Kim, Sunji Kim, Yeong Seok Kim, Yung Hee Korkulu, Zeren Kwak, Donghyeon Lassen, Jens Lee, Jin Ho Lee, Jung Woo Lim, Chaeyeong Park, Joochun Ohayon, Ben Park, Sung Jong Pereira-Lopez, Xesus Plattner, Peter Pyeun, Sung Jae Rodríguez, Liss V. Sahoo, B. K. Shin, Taeksu Son, Changwook Son, Yonghyun Song, Jaehyeon Stuhl, Laszlo Tshoo, Kyoungho Watanabe, Hiroshi Yeon, Yeong Heum Yim, Hee Jung Yu, Hoon |
| author_facet | Won, Junho Ha, Jeongsu Ahn, Deuk Soon Ahn, Sunghoon Chavan, Vivek Chekhovska, Anastasiia Gu, Gyoungmo Hahn, Kevin Insik Heo, Seongjin Huh, Jangyong Kim, Dahee Kim, Do Gyun Kim, Dong Geon Kim, Jung Bog Kim, Sunji Kim, Yeong Seok Kim, Yung Hee Korkulu, Zeren Kwak, Donghyeon Lassen, Jens Lee, Jin Ho Lee, Jung Woo Lim, Chaeyeong Park, Joochun Ohayon, Ben Park, Sung Jong Pereira-Lopez, Xesus Plattner, Peter Pyeun, Sung Jae Rodríguez, Liss V. Sahoo, B. K. Shin, Taeksu Son, Changwook Son, Yonghyun Song, Jaehyeon Stuhl, Laszlo Tshoo, Kyoungho Watanabe, Hiroshi Yeon, Yeong Heum Yim, Hee Jung Yu, Hoon |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_26922 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Experimental and theoretical studies of hyperfine structures in $^{21}$Na Won, Junho Ha, Jeongsu Ahn, Deuk Soon Ahn, Sunghoon Chavan, Vivek Chekhovska, Anastasiia Gu, Gyoungmo Hahn, Kevin Insik Heo, Seongjin Huh, Jangyong Kim, Dahee Kim, Do Gyun Kim, Dong Geon Kim, Jung Bog Kim, Sunji Kim, Yeong Seok Kim, Yung Hee Korkulu, Zeren Kwak, Donghyeon Lassen, Jens Lee, Jin Ho Lee, Jung Woo Lim, Chaeyeong Park, Joochun Ohayon, Ben Park, Sung Jong Pereira-Lopez, Xesus Plattner, Peter Pyeun, Sung Jae Rodríguez, Liss V. Sahoo, B. K. Shin, Taeksu Son, Changwook Son, Yonghyun Song, Jaehyeon Stuhl, Laszlo Tshoo, Kyoungho Watanabe, Hiroshi Yeon, Yeong Heum Yim, Hee Jung Yu, Hoon Atomic Physics Nuclear Experiment Nuclear Theory 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. |
| title | Experimental and theoretical studies of hyperfine structures in $^{21}$Na |
| topic | Atomic Physics Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2605.26922 |