Comment on "Time modulation of the K-shell electron capture decay rates of H-like heavy ions at GSI experiments", arXiv:0908.0877

Understand

According to GSI experiment Phys.Lett.B 664, 162 (2008), the rate of the daughter ion production by the K-shell electron capture (with neutrino emission) in H-like ions 142Pm, 140Pr and 152I is modulated with a period of 6 to 7 seconds.

• In PRL 103, 062502, 2009 by Ivanov and Kienle (also by Lipkin}) there is a claim that neutrino oscillations may explain this result.
• In arXiv:0811.2302 by Lambiase et al a different explanation is suggested which is based on the rotation of electron and nuclear spins.
• The aim of this Comment is to show why these explanations are not satisfactory and to discuss other possibilities.