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- W2034121976 abstract "In recent experiments at the GSI, Darmstadt, time-modulated orbital Electron Capture (EC) decays of H-like 140Pr58+, 142Pm60+ and 122I52+ ions with one electron in the K-shell, coasting in the ESR storage ring with velocity β = 0.71, were observed. The EC-branches observed using time-resolved Schottky Mass Spectroscopy show exponential decay curves time-modulated with periods T = 7.06(8) s, T = 7.10(22) s, and T = 6.16(3) s and amplitudes a = 0.18(3), a = 0.23(4), and a = 0.16(2) for 140Pr, 142Pm, and 122I decays, respectively. The β+ branch of 142Pm shows no modulation with a < 0.03. As origin of the modulation, we propose quantum beats produced by massive neutrino mass-eigen states emitted in the two body weak decay. From the modulation frequency a value for the difference of the quadratic mass values m22 − m21 = 2.22(3) × 10−4 eV2 is deduced, which is 2.9 times larger than the value derived by the KamLAND antineutrino oscillation experiment. The origin of the small modulation amplitudes is discussed as the result of partial restoration of the interference terms which are expected to cancel for the usual assumed unitarity of the neutrino flavour mixing matrix." @default.
- W2034121976 created "2016-06-24" @default.
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- W2034121976 date "2011-01-01" @default.
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- W2034121976 title "Time-modulation of entangled two-body weak decays with massive neutrinos" @default.
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