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SUMMARY:High-precision frontier: applications from atomic physics to BSM
DTSTART:20260615T070000Z
DTEND:20260615T090000Z
DTSTAMP:20260615T155300Z
UID:indico-event-28@ynuclear-indico.yonsei.ac.kr
DESCRIPTION:High-precision frontier: applications from atomic physics to B
 SM\nSpeaker:  Jeongsu Ha (Center for Exotic Nuclear Studies\, Institute f
 or Basic Science\, Daejeon\, Korea)\nDate: 2026. 06. 15. (Mon) 16:00 \nVe
 nue: Science Hall #327\n Measuring a physical quantity with high precisio
 n provides an opportunity to test the fundamental laws and unveil new phys
 ics. The high-precision frontier has been a complementary approach to the 
 high-energy frontier represented by the LHC [1]. Moreover\, the high-preci
 sion measurement in atomic physics provides a testing ground for atomic ca
 lculations of many-electron systems. In this seminar\, I will present two 
 high-precision measurements recently conducted in the accelerator-based nu
 clear physics laboratories.\n The 10C superallowed beta-decay branching r
 atio measurements were performed at INFN Legnaro National Laboratories in 
 2023 and 2025. 10C has the largest impact on the Fierz interference term (
 hence scalar current) search. Despite the importance of the measurement\, 
 only two experiments [2\, 3] have been performed with the HPGe detector ar
 ray. Their salient difference in the systematic uncertainty raises a quest
 ion about the reliability of the measurements. The new experimental setup 
 employed the HPGe tracking array AGATA to increase the efficiency and take
  advantage of segmented crystals.\n Recently\, the hyperfine structure co
 nstants were measured for the neutron-deficient isotope 21Na using CLaSsy\
 , a setup dedicated to collinear laser spectroscopy at RAON [4]. A systema
 tic comparison with the state-of-the-art ab initio relativistic coupled cl
 uster calculations shows the role of higher-order correlation effects such
  as triple excitations in 21Na. The experimental setup and the plan for th
 e isotope-shift measurement will be introduced.\n \nReferences1. M. Gonz
 ález-Alonso\, O. Naviliat-Cuncic\, and N. Severijns\, Prog. Part. Nucl. P
 hys. 104\, 165 (2019).2. G. Savard et al.\, Phys. Rev. Lett. 74\, 1521 (19
 95).3. B. K. Fujikawa et al.\, Phys. Lett. B 449\, 6 (1999).4. J. Won et a
 l.\, submitted to Phys. Rev. A (2026)\; arXiv:2605.26922.\n \n\n \n\nhtt
 ps://ynuclear-indico.yonsei.ac.kr/event/28/
URL:https://ynuclear-indico.yonsei.ac.kr/event/28/
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