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SUMMARY:Observation of non-exponential orbital electron-capture decays of 
 stored hydrogen-like ions
DTSTART;VALUE=DATE-TIME:20080627T093000Z
DTEND;VALUE=DATE-TIME:20080627T103000Z
DTSTAMP;VALUE=DATE-TIME:20261111T223749Z
UID:indico-event-1640@indico.ific.uv.es
DESCRIPTION:This talk reports on the observation of time-modulated orbital
  electron-capture decays of hydrogen-like 140Pr58+ and 142Pm60+ ions coast
 ing in the ion storage-cooler ring ESR at GSI. By using non-destructive\, 
 time-resolved Schottky mass spectrometry of single ions it turned out that
  the expected exponential decay is periodically modulated in time with an 
 oscillation period of about 7 seconds for both systems. By our special det
 ection technique most of systematical errors\, such as time-modulated dete
 ction efficiencies\, can be excluded - at the expense of restricted counti
 ng statistics\, however. It is demonstrated that "classical" explanations 
 of our findings\, e.g. a periodic change of the population of the two hype
 rfine states of the parent ions\, are rather unlikely.\nThe observed effec
 t is meanwhile broadly discussed in the literature. Some scenarios show th
 at our observations can be attributed to the coherent creation of finite m
 ass eigenstates of the electron neutrino in these two-body weak decays. It
  will be figured out how this hypothesis of a special kind of "quantum bea
 ts" could be corroborated or disproved in other two-body weak decays. Corr
 esponding experiments are already approved and scheduled for the near futu
 re.\n\nhttps://indico.ific.uv.es/event/1640/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1640/
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