High-resolution measurement of the time-modulated orbital electron capture and of the ${\beta }^{+}$ decay of hydrogen-like ${}^{142}$Pm${}^{60+}$ ions

Abstract

The periodic time modulations, found recently in the two-body orbital electron-capture (EC) decay of both, hydrogen-like ${}^{140}$Pr${}^{58+}$ and ${}^{142}$Pm${}^{60+}$ ions, with periods near to 7s and amplitudes of about 20%, were re-investigated for the case of ${}^{142}$Pm${}^{60+}$ by using a 245 MHz resonator cavity with a much improved sensitivity and time resolution. We observed that the exponential EC decay is modulated with a period $T=7.11(11)$s, in accordance with a modulation period $T=7.12(11)$ s as obtained from simultaneous observations with a capacitive pick-up, employed also in the previous experiments. The modulation amplitudes amount to $a_R=0.107(24)$ and $a_P=0.134(27)$ for the 245 MHz resonator and the capacitive pick-up, respectively. These new results corroborate for both detectors {\it exactly} our previous findings of modulation periods near to 7s, though with {\it distinctly smaller} amplitudes. Also the three-body ${\beta }^{+}$ decays have been analyzed. For a supposed modulation period near to 7s we found an amplitude $a=0.027(27)$, compatible with $a=0$ and in agreement with the preliminary result $a=0.030(30)$ of our previous experiment. These observations could point at weak interaction as origin of the observed 7s-modulation of the EC decay. Furthermore, the data suggest that interference terms occur in the two-body EC decay, although the neutrinos are not directly observed.

In memoriam of Prof. Paul Kienle, 9 pages, 1 table, 5 figures Phys. Lett. B (2013) online

References in corpus (8)

• Observation of Non-Exponential Orbital Electron Capture Decays of Hydrogen-Like ${}^{140}$Pr and ${}^{142}$Pm Ions
• Measurement of the ${\beta }^{+}$ and orbital electron-capture decay rates in fully-ionized, hydrogen-like, and helium-like ${}^{140}$Pr ions
• Rates of Processes with Coherent Production of Different Particles and the GSI Time Anomaly
• Weak decays of H-like 140Pr58+ and He-like 140Pr57+ ions
• Measurement of masses of the ${\Xi }_c(2645)$ and ${\Xi }_c(2815)$ baryons and observation of ${\Xi }_c(2980)\to {\Xi }_c(2645)\pi$ %and observation of the ${\Xi }_c(2980)$ and observation of ${\Xi }_c(2980)\to {\Xi }_c(2645)\pi$
• On the time modulation of the K-shell electron capture decay rates of H-like heavy ions at GSI experiments
• On the Time-Modulation of the beta^+$-Decay Rate of H-like 140Pr58+ Ion
• The GSI anomaly

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