Can Hyperfine Excitation explain the Observed Oscillation-Puzzle of Nuclear Orbital Electron Capture of Hydrogen-like Ions?

Abstract

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.

References in corpus (5)

• Tests of the standard electroweak model in beta decay
• Observation of Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like ${}^{140}$Pr and ${}^{142}$Pm Ions
• Measurement of the ${\beta }^{+}$ and orbital electron-capture decay rates in fully-ionized, hydrogen-like, and helium-like ${}^{140}$Pr ions
• Weak decays of H-like 140Pr58+ and He-like 140Pr57+ ions
• The GSI oscillation mystery

Cited by in corpus (10)

• Nuclear Physics Experiments with Ion Storage Rings
• High-resolution measurement of the time-modulated orbital electron capture and of the ${\beta }^{+}$ decay of hydrogen-like ${}^{142}$Pm${}^{60+}$ ions
• New Test of Modulated Electron Capture Decay of Hydrogen-Like ${}^{142}$Pm Ions: Precision Measurement of Purely Exponential Decay
• Neutrino effects in two-body electron-capture measurements at GSI
• Neutrino magnetic moment effects in electron-capture measurements at GSI
• GSI anomaly and spin-rotation coupling
• Electromagnetic modulation of monochromatic neutrino beams
• Lifetime measurements of nuclei in few-electron ions
• Decay Oscillations in Electron Capture and the Neutrino Mass Difference
• Finite-nuclear-size effect for hydrogenlike ions under high external pressure