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Observation of Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like $^{140}$Pr and $^{142}$Pm Ions

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arxiv 0801.2079 v1 pith:JVZBWUT6 submitted 2008-01-14 nucl-ex hep-phnucl-th

Yu.A. Litvinov , F. Bosch , N. Winckler , D. Boutin , H.G. Essel , T. Faestermann , H. Geissel , S. Hess
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P. Kienle R. Knöbel C. Kozhuharov J. Kurcewicz L. Maier K. Beckert P. Beller C. Brandau L. Chen C. Dimopoulou B. Fabian A. Fragner E. Haettner M. Hausmann S.A. Litvinov M. Mazzocco F. Montes A. Musumarra C. Nociforo F. Nolden W. Pla{ss} A. Prochazka R. Reda R. Reuschl C. Scheidenberger M. Steck T. Stöhlker S. Torilov M. Trassinelli B. Sun H. Weick M. Winkler
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classification nucl-exhep-phnucl-th
keywords electroncapturedecaydecayshydrogen-likeionsmassobservation
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abstract

We report on time-modulated two-body weak decays observed in the orbital electron capture of hydrogen-like $^{140}$Pr$^{59+}$ and $^{142}$Pm$^{60+}$ 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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    A framework is developed to predict axion-induced time modulations in weak nuclear decays, used to derive constraints on the axion decay constant from reanalyzed Gran Sasso data on 40K and 137Cs and to propose future ...

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