Modulated in time orbital electron capture (EC) decays have been observed recently in stored H-like $^{140}$Pr$^{58+}$ and $^{142}$Pm$^{60+}$ ions. Although, the experimental results are extensively discussed in literature, a firm interpretation has still to be established. Periodic transitions between the hyperfine states could possible lead to the observed effect. Both selected nuclides decay to stable daughter nuclei via allowed Gamow-Teller transitions. Due to the conservation of total angular momentum, the allowed EC decay can only proceed from the hyperfine ground state of parent ions. In this work we argue that periodic transitions to the excited hyperfine state (sterile) in respect to the allowed EC decay ground state cannot explain the observed decay pattern.
The hyperfine interaction as a probe of the microscopic structure of the atomic nucleus
Center for Quantum Nanoscience, Institute for Basic Science（量子纳米科学中心，基础科学研究院）；Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg（斯特拉斯堡大学，法国国家科学研究中心，斯特拉斯堡材料物理与化学研究所）；Ewha Womans University（梨花女子大学）；Université de Strasbourg, CNRS, Institut de Chimie（斯特拉斯堡大学，法国国家科学研究中心，化学研究所）；Université de Strasbourg, CNRS, Institut pluridisciplinaire Hubert Curien（斯特拉斯堡大学，法国国家科学研究中心，于贝尔·居里跨学科研究所）
Hyperfine-resolved laser excitation and detection of nuclear isomer in trapped $^{229}$Th$^{3+}$ ions
Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；Center for Photonic Quantum Precision Measurement, Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology（北京理工大学前沿交叉科学研究院光子量子精密测量中心）；Beijing Institute of Technology, State Key Laboratory of Environment Characteristics and Effects for Near-space（北京理工大学临近空间环境特性与效应省部共建国家重点实验室）；Johannes Gutenberg-University Mainz（美因茨约翰内斯·古腾堡大学）；Beijing Computational Science Research Center（北京计算科学研究中心）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；School of Nuclear Science and Technology, University of Chinese Academy of Sciences（中国科学院大学核科学与技术学院）
Investigating Roles of Triple Excitations for High-precision Determination of Clock Properties of Alkaline Earth Metal Singly Charged Ions
Atomic, Molecular and Optical Physics Division, Physical Research Laboratory（物理研究实验室原子、分子与光学物理分部）；Indian Institute of Technology Gandhinagar（甘地纳加尔印度理工学院）
