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arxiv: 0801.2079 · v1 · submitted 2008-01-14 · ⚛️ nucl-ex · hep-ph· nucl-th

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

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. Kn\"obel 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. St\"ohlker S. Torilov M. Trassinelli B. Sun H. Weick M. Winkler
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classification ⚛️ nucl-ex hep-phnucl-th
keywords electroncapturedecaydecayshydrogen-likeionsmassobservation
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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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