Observation of non-exponential orbital electron capture decays of hydrogen-like 140Pr and 142Pm ions
- Litvinov, Yu.A.
- Bosch, F.
- Winckler, N.
- Boutin, D.
- Essel, H.G.
- Faestermann, T.
- Geissel, H.
- Hess, S.
- Kienle, P.
- Knöbel, R.
- Kozhuharov, C.
- Kurcewicz, J.
- Maier, L.
- Beckert, K.
- Beller, P.
- Brandau, C.
- Chen, L.
- Dimopoulou, C.
- Fabian, B.
- Fragner, A.
- Haettner, E.
- Hausmann, M.
- Litvinov, S.A.
- Mazzocco, M.
- Montes, F.
- Musumarra, A.
- Nociforo, C.
- Nolden, F.
- Plaß, W.
- Prochazka, A.
- Reda, R.
- Reuschl, R.
- Scheidenberger, C.
- Steck, M.
- Stöhlker, T.
- Torilov, S.
- Trassinelli, M.
- Sun, B.
- Weick, H.
- Winkler, M.
DOIAbstract
AbstractWe report on time-modulated two-body weak decays observed in the orbital electron capture of hydrogen-like 140Pr59+ and 142Pm60+ ions coasting in an ion storage ring. Using non-destructive single ion, time-resolved Schottky mass spectrometry we found that the expected exponential decay is modulated in time with a modulation period of about 7 seconds for both systems. Tentatively this observation is attributed to the coherent superposition of finite mass eigenstates of the electron neutrinos from the weak decay into a two-body final state
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