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Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like Ions N. Severijns for the CERN, Gothenburg, Darmstadt, Leuven, Valencia, Münster, Aarhus,

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Presentation on theme: "Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like Ions N. Severijns for the CERN, Gothenburg, Darmstadt, Leuven, Valencia, Münster, Aarhus,"— Presentation transcript:

1 Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like Ions N. Severijns for the CERN, Gothenburg, Darmstadt, Leuven, Valencia, Münster, Aarhus, Bratislava 2 Collaboration ~6s cooling time Fit by: dN EC /dt = N 0 λ EC exp(-λt) [1 + a cos(ωt + φ)] Schottky Mass Spectrometry signal Yu.A. Litvinov et al., Phys. Lett. B 664 (2008) 162

2 IsotopeT lab (s)a 142 Pr7.10(22)0.23(4) 140 Pm7.06(8)0.18(3) 122 I6.05(4)0.21(2) Summary of ESR-GSI results : One suggested interpretation: beats due to neutrino mixing  expect T lab = h  2 M / Δ 2 m 12 : - observed mass dependence - (Δ 2 m 12 ) exp  2.5 (Δ 2 m 12 ) Kamland ( not observed in ‘normal’ EC decays or in  + decays ) Still to be checked : - E ion dependence - He like ions - different B-settings - … - verify at other/different setups (Lhanzou, ISOLDE)

3 Requirements : 1. well defined t = 0 (production) 2. O(10 -10 mbar) vacuum (NEG pumps) 3. non-disturbing cooling method (evaporative cooling) 4. beam line from REX-ISOLDE to WITCH (design ongoing) 5. results for ongoing WITCH project secured Verify oscillations at ISOLDE using : REX-EBIS  produce hydrogenlike ions & WITCH  store in Penning ion trap Candidate isotopes : T 1/2 [ s ] EC/β + [ % ] yield (CaO ; cold line) 19 Ne17.250.100~ 5E6 /  C 35 Ar1.7750.073 ~ 5E7/  C

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